Diesel Injector Leak Off Test and Nozzle Clean DIY (Bosch Injectors for BMW M47 M57 engines)

How easy is it to check your BMW Bosch diesel injectors for good operation using a leak-off test and then clean the nozzles? Will ultrasonic cleaning work? Will high pressure washing work? What are the tricks to easy injector removal? How do we see the spray pattern to verify that it is good? How do we know if the needle valve is end-of-life? How do we make sure that our injectors don't leak after we install them? Watch and find out! This video applies to many diesel cars made between 2000 and 2007 that use Bosch electro-mechanical injectors, and applies specifically to BMW M47, M57 and M67 diesel engines from 2000 to 2007 (or so). This video does not apply to mechanical injectors or piezo-electric injectors (although there are many similarities).
Subscribe! / @stevenbtuner
#BMW #BMWDIY #BoschCarService
Here is a breakdown of the chapters in this video:
00:00 Intro
00:38 Corrected subtitles are now available for all Steven B Tuner videos
01:02 Vehicle Preparation
01:47 Get to the Injectors
02:31 Remove Injector Connections
03:55 Connect Test Equipment
05:41 Run Leak Off Test
07:13 Are the Injectors Good?
07:46 Removal Tips
10:02 Disassemble Injectors
13:36 Inspect Dirty Nozzle
14:09 Ultrasonic Clean the Nozzles
15:06 Inspect the Ultrasonic Cleaned Nozzle
15:44 Pressure Washer Clean the Nozzles
16:34 Re-assemble the Injectors
19:01 Injector Installation Tips, Reaming and Cleaning
20:56 Febi Bilstein Special High Temperature Ceramic Grease
****** Amazon.co.uk Links for United Kingdom Viewers******
Products seen, used or mentioned in this video are available on Amazon via the following paid links: As an Amazon Associate, I earn from qualifying purchases.
- 30 liter Ultrasonic Cleaner: amzn.to/2NoBxGY
- 10 liter Ultrasonic Cleaner: amzn.to/3sVi1Cu
- 3 liter Ultrasonic Cleaner: amzn.to/3sLwVee
- Carburettor Cleaning Solution: amzn.to/2LXoZG8
- 5pc Diesel Injector Reamer Kit: amzn.to/3c5SgJr
- Diesel Injector Removal Kit: amzn.to/3ocSot2
- Diesel Injector Leak-Off Test Kit: amzn.to/3qJjz0n
- Pick-up Tool: amzn.to/365s4Lq
- Flare Nut Wrench Set (inc. 15mm): amzn.to/39Z090H
****** Amazon.com Links for United States / Worldwide Viewers******
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- Diesel Injector Removal Kit: amzn.to/2s3gO12
- Diesel Injector Leak-Off Test Kit: amzn.to/2Q7SSla
- Pick-up Tool: amzn.to/2EykMS2
- Flare Nut Wrench Set: amzn.to/34AZQEt
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[@michaellavery4899]

Thanks for another great video, Stephen. This guy makes the best instructional videos of this type on KZbin. I would like to thank him for the time and patience he has extended to me.

[@StevenBTuner]

:-) :-)

[@StevenBTuner]

Who is ready to check their diesel fuel injectors for good operation, and then give them a nozzle clean? This is the new version of this video, and I’ve included some great extras that were suggested to me by you guys! If you do the leak-off test, and you find that the amount of diesel in each vial is vastly different, or if the amounts are a lot different to what you see in the video - then you should remove your injector/s and send them off for a professional rebuild using genuine Bosch parts, and a re-calibration (you will need to re-code your injectors after). If the leak-off test shows that there are no issues with the injector's high pressure ball valve then you may want to go on to clean the injector nozzles, to make sure that no blocked holes are causing a bad spray pattern. Your engine will continue to run reasonably ok with one, two, or even three blocked nozzle holes, but the resulting bad spray pattern will eventually cause wear on your engine's cylinder walls. It is the slow death of your engine. By doing this service every 100,000 miles, you can help your engine last much longer! Here is a breakdown of the chapters in this video: 0:38 Corrected Subtitles are now available for all Steven B Tuner videos 1:02 BMW Bosch Diesel Injector Servicing - Vehicle Preparation 1:47 BMW Bosch Diesel Injector Servicing Leak-off Test - Get to the Injectors 2:31 BMW Bosch Diesel Injector Servicing Leak-off Test - Remove Injector Connections 3:55 BMW Bosch Diesel Injector Servicing Leak-off Test - Connect Test Equipment 5:41 BMW Bosch Diesel Injector Servicing Leak-off Test - Run Leak Off Test 7:13 BMW Bosch Diesel Injector Servicing Leak-off Test - Are the Injectors Good? 7:46 BMW Bosch Diesel Injector Removal Tips 10:02 BMW Bosch Diesel Injector Nozzle Cleaning - Disassemble Injectors 13:36 BMW Bosch Diesel Injector Nozzle Cleaning - Inspect Dirty Nozzle 14:09 BMW Bosch Diesel Injector Nozzle Cleaning - Ultrasonic Clean the Nozzles 15:06 BMW Bosch Diesel Injector Nozzle Cleaning - Inspect the Ultrasonic Cleaned Nozzle 15:44 BMW Bosch Diesel Injector Nozzle Cleaning - Pressure Washer Clean the Nozzles 16:34 BMW Bosch Diesel Injector Nozzle Cleaning - Re-assemble the Injectors 19:01 BMW Bosch Diesel Injector Nozzle Cleaning - Injector Installation Tips, Reaming and Cleaning 20:56 BMW Bosch Diesel Injector Nozzle Cleaning - Febi Bilstein Special High Temperature Ceramic Grease

[@leonsletterbox2013]

Hello again Steven . Picture says 1000 words. During this video @ 10:20 , with your left hand you touch the injector, this is the part of the injector I mean when I say sleeve/shaft with the O-Ring on it too, this shaft can slide up and down(no side to side movement) 10-15mm on 2 of my injectors but other 2 soild. Any help appreciated thanks from Leon.

[@ay7pre]

thank you for the time you take to put all this details in here, it really makes a difference

[@StevenBTuner]

@@ay7pre You're most welcome!

[@ay7pre]

I wanted to know, after you clean the injectors, do you have to code them so that the engine will start again? or it just starts and runs as before?

[@StevenBTuner]

@@ay7pre Hi, the nozzle cleaning has just brought the injectors back to how they were when they were calibrated, so there is no coding as long as you put them back in the same cylinder, and keep the parts for each injector together throughout the whole process.

[@koetjepeterprahs9263]

This is just my cup of tea.

[@asdwee4444]

Hi, Steven! The video was really good! I would like to add some tips from my own experience: 1. After the disassemble of the fuel injectors, I recommend to put them vertically in a jar with concentrated drain cleaner and leave them in the jar for 2 hours but be careful, the level of the drain cleaner needs to not exceed the middle of the injectors (this will help with the opening of the thread and it helps clean the deposit much easier). 2. As the solution that I use in the ultrasonic cleaner device is concentrated drain cleaner and for the rinsing I use isopropyl alcohol. 3. After you assemble the components of the injector, before you thread it, put a small amount of thread blocker (this is going to help with possible future loses of fuel). Keep going with the awesome videos!

[@StevenBTuner]

Hi, thanks for sharing that great information!

[@mihalym.6876]

Hi Lenard, what do you mean "drain cleaner"? Any specific type of it? (Hungarian is OK as well). Thread blocker you mean a thread locker, like Loctite? What exact type do you use? Thank you your answer in advance!

[@asdwee4444]

@@mihalym.6876 Hi Mihaly , drain cleaner = pure liquid sodium or potasium hidroxide . (lugos oldat amit a Lidl lehet kapni,amit a viz lefolyok kidugaszolasahoz hasznalnak.Ami fontos hogy fojekony oldat legyen. Loctite is ok. (A menetett jo egy csep Loctite-al leblokolni, de ha lehet elote zsiroldo szerel letakaritani,peldaul fekrendszer takarito spray-el )

[@kirwanjohn101]

Thank you for your help in making this video. I removed my 4 bosh injectors from my opel corsa diesel and cleaned the nozzles using an ultrasonic cleaner like you did. The car is running much smoother now. The acceleration is very smooth. My car has 290k km. Thanks again

[@StevenBTuner]

Great job!

[@Flatwaterkayakpm]

@@StevenBTuner Hello, i have a n57 engine with 105k miles, it runs perfect no rough idling, no smoke nothing runs like new, but there is only one and only one issue, when i take the engine cover off i can see wetness around 3 out of my 6 injectors. Does this indicate bad seal o rings(copper ones)or is it something more serious ? Thank you in advance your answer would help me a lot !!

[@kirwanjohn101]

@@Flatwaterkayakpm yes, you have a small leak around the injectors. You will need to remove them and replace all copper washers. First I would recommend cleaning the area and observe it for a week just to make sure that it is not a spillage of oil before you start.

[@JonCianci12]

That was really kind of you to make this video. Thanks!

[@StevenBTuner]

I hope it helps you out!

[@BrainXTV]

Great video. Easy to understand and many tips for people who doing this the first time. Great job. Thank you.

[@StevenBTuner]

Welcome!

[@peterclune4770]

Very good demonstration Steven well done

[@StevenBTuner]

:-)

[@michaeltietzyou]

this is almost the best video I have seen to this theme - thank you. Very helpful also for an Merc W163 270 cdi

[@StevenBTuner]

I'm glad to hear that it helps you out!

[@zeesee3918]

Thanks Steven, I found your videos amazing - it gives a little confidence to do it yourself. Bless you.

[@StevenBTuner]

I'm glad they help you out!

[@briangibbon8711]

An outstanding video Steven. Thank you for sharing the benefit of your hard earned experience in meticulous detail.

[@StevenBTuner]

Welcome!

[@tokenfire111]

Great video Steven. Well explained and easy to watch / listen to.

[@StevenBTuner]

Thanks!

[@Crypt1c]

You made that look easy! Well done sir.

[@StevenBTuner]

Thanks 👍

[@MePeterNicholls]

This has given me confidence to try this myself.

[@StevenBTuner]

I hope you'll report back how it all goes!

[@joeyjones6638]

Excellent video once again mate I wish my teachers at school could of explained things as good as you do and I may have learned a lot more. Great chanel thankyou.

[@StevenBTuner]

I'm glad you liked it! :-)

[@timlewis8231]

Excellent! A clear articulate explanation.

[@StevenBTuner]

Welcome!

[@sparkyhobo3844]

Excellent detailed procedure with easy to follow narrative. A++++

[@StevenBTuner]

Glad you enjoyed it!

[@henriryonankoski]

Just found your channel. Really great videos. You are an true educator!

[@StevenBTuner]

Welcome! :-)

[@nevinhattle1914]

Best mechanic on youtube hands down

[@StevenBTuner]

Thanks!

[@nevinhattle1914]

@@StevenBTuner your more than welcome, when ever I need in depth proper tutorial video's, this is where i come, I have learnt a great deal of information from you, so thank you for your time and effort i am a huge fan

[@mikeslater1865]

Hi, your videos are well presented and easy to follow and understand. They encourage DIY mechanics like me to have a go at doing our own refurbs and repairs, etc, and also save ££££’s. Thank you!

[@StevenBTuner]

Glad to help!

[@ezequielcosta954]

Great video!!One of the best I have seen!!Thanks man!Keep up!!

[@StevenBTuner]

I'm glad you like it!

[@Andy_83_SWE]

Really glad i found your channel. Thx for great help!! Keep it up

[@StevenBTuner]

Welcome to the channel! :-) It's really good to hear that it is helping you out!

[@christianb4994]

Super!! 👍👍 Vielen Dank aus Deutschland. Eine wirklich gute Anleitung. Top!

[@marcellemeyer2380]

An easy test you can do if u experience hard starting is to just simply remove the connectors and return line from the injectors and crank the engine, there should be NO leakage coming from the injectors, any diesel leaking from an injector doing this test is a bad injector and needs to be checked. Great vid :D Edit: this test is obviously only viable if the high pressure pump and rail is generating pressure to the injectors

[@raviragbir6920]

Wow, one of the best I've seen

[@StevenBTuner]

Glad you got something out of it!

[@kirwanjohn101]

I must compliment you on an excellent video and clear instructions. Just did this today on my opel corsa 1.3l diesel and all is well. Thank you.

[@StevenBTuner]

Awesome to hear! Those Corsa injectors are almost identical to the BMW injectors in the vid. Well done on a DIY success!

[@SalimKhan-gk1fh]

Did it run smoother John??

[@StevenBTuner]

@@SalimKhan-gk1fh Hi, the most noticeable difference is usually quicker starting.

[@kirwanjohn101]

@@SalimKhan-gk1fh yes, acceleration is much smoother. Car engine is also quiter. My car has 290k km.

[@user-fu6qu1hd5l]

Good job. Really helpful video. Tnx Steven

[@StevenBTuner]

Hi, glad you like it!

[@the_punisher01]

Wow! After watching this video now I want to refurbish my injectors too. Wish i own an ultrasound cleaner. I know that device make miraculous cleaning. Thanks for the good tips

[@StevenBTuner]

:-) They will all need doing eventually! I'm glad you liked the tips.

[@theEskalaator]

It's not a miracle, but it works quite well. You also need good chemicals for good cleaning.

[@ryanh3285]

Lots of knowledge shared there good video.

[@StevenBTuner]

Thanks 👍

[@kianward5999]

that was a stunning vid pal what great content

[@StevenBTuner]

Thanks!

[@602jon]

As many others have already mentioned these are great videos, well done. Cleaned my N47 BMW DPF after viewing a few of your videos and great results. I did used a pressure washer as well which appears to get some extra ash out. Checked DPF with camera after and no damage. Now very low back pressure and performance restored to like new. Many thanks.

[@StevenBTuner]

Thanks, and great to hear that your DIY DPF clean worked well!

[@nevinhattle1914]

the DPF video was gold

[@jlewy2140]

thanks for so much detailed video !

[@StevenBTuner]

You're welcome!

[@koetjepeterprahs9263]

Sir, You are a car hero!

[@StevenBTuner]

:-) Thank you for watching!

[@focusmicro]

I have to replace my cylinder head cover gasket tomorrow (B47 engine), and came across this video ( thank you) to clean the injectors too!

[@StevenBTuner]

You are most welcome, and all the best with the job!

[@stuungar3390]

Very therapeutic tutorial

[@StevenBTuner]

Therapy for the injectors too :-)

[@stuungar3390]

@@StevenBTuner - lol, everyone's happy

[@magicmax6973]

best assembly video, thank u very much

[@StevenBTuner]

You are most welcome!

[@stephenkelly5642]

A very clear informative video. 👌

[@StevenBTuner]

:-)

[@gidmosia7065]

You are a Legend Steve Thanks once more

[@StevenBTuner]

Thanks!

[@greglevi1633]

Thanks a lot. Keep up what you doing.

[@StevenBTuner]

Thanks, will do!

[@benjietan6475]

Tnx watching your videos from baguio city philippines

[@StevenBTuner]

Thanks for watching! :-)

[@longhuynh5249]

Amazing video, loved it.

[@StevenBTuner]

Glad you enjoyed it!

[@lassesebarbar]

Thank You Steven i report back to You of my progress with my Skoda Superb 2011

[@StevenBTuner]

All the best with the job!

[@seankirby2580]

Steven, you're amazing. I have a 2010 BMW 316d LCI and at least 1 injector is dodgy, putting the yellow "drive slowly" light on. I saw white smoke, smelling of diesel, from the exhaust. I was frightened of the injectors at £1200 ($1600) the set. Not any more, thanks to you. I owe you, mate. Brilliant.

[@StevenBTuner]

Hi, there still might be something terminal with your injectors - but it is good to have the knowledge to check and correct everything you can.

[@seankirby2580]

@@StevenBTuner I've just removed 1 injector (twice). I bought a used replacement for £25 and I'll see how it goes now. I had to remove the replacement because I was too tight to buy a new copper washer. Once annealed, it's OK now. You've been a massive help to me and I'm grateful.

[@StevenBTuner]

@@seankirby2580 Great to hear that it all worked out - well done!

[@seankirby2580]

@@StevenBTuner Update later. I did still have a problem. Fuel starvation on high loads. Bought a leak-off kit and a second hand injector. The test showed the "new" injector (cheap ebay buy) hardly leaked back whereas the old ones filled 30ml in a minute at tickover. Off to ebay for more. So much fuel leaking back that the high pressure rail pressure was low. My old injectors did 137,000 miles / 220,000km. Very grateful for your help.

[@livewildbirdnestcamera]

@@seankirby2580 Hi, sounds like you are on the right track!

[@thegrimreaper8843]

Good video as always Steven! :-)

[@StevenBTuner]

Glad you enjoyed it!

[@virx15]

Seems a bit more complicated than spark plugs replacement. Thanks for the great video.

[@OctavChelaru]

Brilliant bideo man, thanks for sharing!

[@StevenBTuner]

Glad you enjoyed it!

[@luizalbertoesposito4010]

Very Nice your explanation!! Best Regards!! Luiz Esposito

[@StevenBTuner]

You are most welcome!

[@stuart1030]

Absolutely brilliant video, . You have tought me so much and i have enjoyed every single second of it. Thank you, thumbs up and subscribed. ****************

[@StevenBTuner]

:-) :-)

[@kirwanjohn101]

Very clear instructions

[@StevenBTuner]

I'm glad the vid helped you out!

[@NinpoUK]

Bookmarked this after I got a 004B10 code, the glow plug controller had been faulty before so I'm guessing it's had a knock on effect to one or more injectors. I now know how to run the leak off test, thank you!

[@StevenBTuner]

Hi, they aren't directly related, but if the glow plugs aren't operating then there could certainly be a bit more black soot clogging up the combustion chamber every time you do a cold start, which might end up in the fuel injector tips.

[@nateryan7041]

Man that's a great video 👌👌👌 I've learned alot today I've got the BMW m57 engine in my range rover and I think she's got a bad injector or 2 !! At least I have a great know how to guide on how to test them

[@StevenBTuner]

I hope it helps you get your Range Rover back to full health!

[@nateryan7041]

@@StevenBTuner me too I'm not sure if it's a turbo issue or an injector issue or both ?? 😂😂

[@StevenBTuner]

...or as it usually goes: both of those plus a couple of more things!

[@nateryan7041]

@@StevenBTuner I'm Gona check the EGR valve aswell but I'm Gona do away with it to be honest !! Is there anything else you would recommend checking ??

[@StevenBTuner]

Hi, a full health check would start with error codes and then move on to a quick check of everything from the turbo (shaft movement/excess oil) to the intercooler (leaking hoses), and if you are removing the EGR then it could be the right time to make sure that the intake manifold starts of nice and clean, so that it can stay that way going forward.

[@mpgalhenage]

Thank you very useful 😊

[@yunuscoban4899]

Nice video, thanks man.

[@StevenBTuner]

Glad you liked it!

[@zaida500]

You need this!!!

[@waleedkhalid6021]

So helpfull vedio thank you

[@StevenBTuner]

Most welcome 😊

[@THEDIESELCHANNEL]

Great video. Thank you.

[@StevenBTuner]

Thanks for watching!

[@richardtaylor6322]

Excellent video thanks

[@StevenBTuner]

Glad you enjoyed it!

[@mahdi487]

Perfect. Mate! I learnt from you🙏😇🥳🥰❤️

[@StevenBTuner]

Super! :-)

[@danilosakovic8243]

Nice video, done this few times... Exact, good, and right procedure. Just one very very important note: Never ever ever never under no circumstance EVER REUSE!!!!!!! copper washer!!!!! Always buy NEW and ORiGINAL washers before this procedure. And don't forget to clean injector hole like shown in this video. Especially bottom part where your Cooper washer sits... Good joob man, liked, subscribed. I am glad you got rid of, mouth sounds from your earlier videos... Good job jebeno mljackanje :)

[@StevenBTuner]

Thanks for watching, and for noticing the improvements!

[@asimturkiye1453]

Tesekkur ederim Steven , ellerine saglik , guzel bir calisma olmus

[@StevenBTuner]

Rica ederim!

[@asimturkiye1453]

@@StevenBTuner je vais acheter la meme machine ultrason que toi est-ce une 40w ou 100w ? Faut il acheter son liquide aussi ? Enfin dois je reprogrammer mes injecteurs ? Merci d'avance

[@JOSEF7011]

The copper washers must be annealed before installation, otherwise there is a risk of exhaust fumes around the injector. Good job sir!

[@StevenBTuner]

Hi, the washers you get direct from Bosch are ready to use as far as I know, but if you were handling a lot of injector rebuilds then it would definitely be cost effective to buy bulk washers and treat them yourself.

[@mirkovickovic7059]

Excellent job thank you

[@StevenBTuner]

You're welcome!

[@julesviolin]

Excellent work. I tried using injector cleaner directly on the nozzles but it is not effective. The only way is your dismantling method 👍👍

[@StevenBTuner]

They are stubborn little carbon deposits for sure!

[@fiksefant]

Thanks alot for a easily understandable DIY video about these injectors. I've some Bosch injectors for a PSA DV6 engine, I belive they are pretty identical, who need a cleanup after 16 years and 292.000KM :-)

[@StevenBTuner]

Hi, at those kms there is guaranteed to be a few blocked holes!

[@fiksefant]

@@StevenBTuner Hehe, yes I guess you're right. Still I've used some diesel booster last couple of years, so it runs pretty clean. I just did the job with new copper gaskets and sealings on this car. Unfortunately the ones who did this job before me has done a left-hand job, so I had quite some struggles to do it properly. Now one injector are not working properly at low rpm / low load, ok at load, so I'll do the cleanup on all 4 and see if it helps..

[@fiksefant]

@@StevenBTuner Feedback: All 4 had perfect spread. Surprise! No blocking, not even a slight hint of anything but a nice spray! I guess that diesel-booster I always use is doing the job. These injectors have been sat for at least 150.000KMs since a local Ford garage had the job with cleaning and replacing the copper shims... I'm quite sure they did not do anything but that job, no cleaning like you showed in video here. But... One of the injectors has been beaten quite alot, both by Ford garage (who gave up extracting that one) and now me when I after hours with heat, solvents and force finally managed to pull it out. I also found broken treads in one of the clamp bolts for that specific injector, so now Im starting the fun job with Time-Sert and see if that works fine. Hmm... Another reason never leave the job to "proffesionals", hehe.

[@StevenBTuner]

@@fiksefant All the best with the job!

[@AndrewBrowner]

good stuff just pulled mine i have about 6mm of carbon on the tips.. might be why it was smoking (12v cummins ppump mechanical injectors) , you must moonlight as a radio DJ with that voice hahah

[@StevenBTuner]

Hi, good work! It could be a good idea to check the rest of the intake system for nasty buildups too.

[@davidelliott5843]

The sleeve nut on the bottom of the engine can be EXTREMELY tight. I used an 15mm AF deep six-point socket and 600mm breaker bar. The extra length gives better control but it was glad of it.

[@StevenBTuner]

Certainly is!

[@leonsletterbox2013]

Hi just noticed, the part of the injector with the o-ring, is this shaft/ sleeve suppose to move/slide 10-15mm up or down thanks much appreciate

[@emilioguitart3754]

Wow what a perfectly detailed job !!! Do you need to recode it? They definitely going to spray more than before...or at least clear adaptations?

[@StevenBTuner]

Hi, thanks for watching, and glad you appreciate the detail :-) There is no need to re-code as this job takes the injectors back to match the calibration that is written on them. If the top end is disassembled then they will need to be re-calibrated. Clearing any fuel trim adaptations isn't a bad idea though.

[@brendenmoldy]

Nice! THanks!

[@StevenBTuner]

Welcome!

[@AlishanKhwaja]

Good work

[@StevenBTuner]

:-)

[@AsiAzzy]

One thing to say about cleaning injector holes in the head. DO NOT REAM if not necessary! PLUG THE HOLE while cleaning! So there is injector plugs ( a bronze/copper tip shaped like the injector tip with a threaded hole in the back). You push the plug deep in the hole and un-thread the rod leaving the plug in the injector hole. Then there is a fine brass wirebrush with a sleeve. Yo insert the wirebrush with the sleeve covering the bristles, then retract part of the sleeve to expose the bristles inside the injector hole on the flat surface and give it some twists to wirebrush the hole. Then with compressed air an a long tip you blow out all the gunk from the wirebrushing (the brass plug will still be seated and prevent any gunk entering the engine). Remove the plug by threading the rod on the back of the plug and pull the plug. Repeat for every cylinder. Reaming is needed if after wirebrushing there is pitting and score marks that could not be sealed by the copper washer. Reaming is quite bad, but as last resort may work. By reaming the injector will seat deeper in the chamber and can create a LOT of side effects. One of the worst side effects will be cracking the piston head because the diesel spray may wet the top of the piston causing a sharp cooling before ignition because the injector tip is much closer to the piston. I have a whole set of iveco truck pistons all of them have 5 cracks in the omega chamber of the piston aligning with the 5hole injection pattern. That truck head was reamed several times and the injector was sitting 3mm deeper than intended. those 3mm made this cracking possible. And by cracking i mean deep cracks and in several pistons even blown chunks of the omega chamber with huge loss of pressure under the piston creating major problems in the oiling system and PCV leading to runaway diesel engines and may blow up the turbo from improper oiling with contaminated oil and aerated oil from the huge crank pressure. All of this for 3mm of ream in a 120mm bore engine for a truck. In a passenger car tolerances are much higher (for the much smaller bore and stroke) and 1mm might create similar problems. So do not ream! and if you do, compensate with a thicker copper washer to sit the injector tip at precisely the right height!

[@StevenBTuner]

Excellent points - thankyou for taking the time to write such a detailed comment!

[@AsiAzzy]

@@StevenBTuner you're welcome. Congrats on all the content you do. I will actually clean my dpf based on your content. I actually am very close to the field of automotive beeing phd automotive enginer working at a prestigious automotive engineering university with many colaboration including Bosch diesel injection training center, zf, castrol and plenty others. I say this not to boast myself, but just to have a bit of perspective about my background as it do matters sometimes where the information is coming from.

[@automotiverepairviet8733]

Thank for your video

[@StevenBTuner]

You are welcome!

[@anektritrong3026]

Good job.

[@StevenBTuner]

Thanks!

[@anitarabar6291]

Do you have to use new o rings when you re-install , as well as silicone grease ?

[@orckaso6513]

gr8 information. tnx

[@StevenBTuner]

Most welcome!

[@MrQisar]

Thanks Steven

[@StevenBTuner]

You're welcome!

[@albiondream]

Nice vid, bud! I was wondering what brand of carburettor cleaner u used as reviews on sum I’ve seen have been questionable.

[@StevenBTuner]

Thanks! For the vid I used "Carburettor Ultrasonic Cleaning Solution" from Allendale-Ultrasonics.co.uk mixed 1:10 with water.

[@jrodri14ii]

Thanks!

[@StevenBTuner]

You are most welcome!

[@barry6873]

cool steven thank you

[@StevenBTuner]

Welcome!

[@pro-powerflushing]

@@StevenBTuner yea it’s a great video I’ve put one new injector in mine focus1.6dtci after it showing uo a daily code and going into limp mode - but it’s still not runing as it shoud so I’ve ordered a leak down kit n de what it says results - I’m gona clean all the injectors anywsy n see if it makes a difference I got an ultrasonic Bath also definetly worth a try 👍

[@StevenBTuner]

@@pro-powerflushing Be great to hear how it goes!

[@barry6873]

@@StevenBTuner ile let you know when i done it :}

[@patrickmaritano3802]

Thank you very much

[@StevenBTuner]

You're welcome!

[@brentsmith5647]

Brilliant video thank u 👍👍👍👍👍👍👍👍👍👍👍👍👍👍👍👍👍👍👍👍👍👍👍👍👍👍👍👍👍👍👍👍👍👍👍👍👍👍👍👍👍👍👍👍👍👍👍👍👍👍👍👍👍👍👍👍👍👍👍👍👍👍👍👍👍👍👍👍👍

[@StevenBTuner]

You are most welcome!

[@jonphillips5119]

Good info as normal

[@StevenBTuner]

Hi, thanks for watching and glad you think so!

[@cristiana3355]

It will be similar operation on a mk7 golf? Great video.

[@StevenBTuner]

Hi, you will have to look up the part numbers for your car to see if the injectors are of a similar type.

[@madmikemakes3056]

Hi Steven. Thanks for a great video. My Opel Vivaro is very laggy/underpowered (also heavy on fuel) and I was thinking it could be the injectors. Going to give them a clean now that I'm feeling more confident thanks to the video.

[@StevenBTuner]

Good luck with the job - I hope you'll report back on how it goes!

[@madmikemakes3056]

Hi Steven. I just pulled injector no:4 and the needle looks very discolored (High heat) and also had carbon on the stem. The previous injector was silver with no discoloration and no carbon. Any idea what could cause that? Thanks

[@erkanisik1441]

@@madmikemakes3056 enjektör işeme yapıyor bir tamrcide ayar yapdır

[@StevenBTuner]

@@madmikemakes3056 Hi, it could be that the needle in that injector has been completely stuck at some point. What sort of results did you get with the leak-off test?

[@madmikemakes3056]

@@StevenBTuner Hi Steven I didn't do a leak off test. Need to buy a kit. It's next on my list to do.

[@trashtrash4417]

Hi Steven, awesome video! You encouraged me to give my injectors a nice cleaning too after 320.000km and some beginning „smoke issues“ But before: how was the result of your work? All injectors still running?

[@StevenBTuner]

Hi, it is now coming up to 100,000 kms since I did that job - so I probably should do another leak off test to make sure everything is still good.

[@timkimone]

Hi there Can you help and show me where EGR valve location on 2015 ml 250 Bluetec Thank you so much

[@geppiemockingbird1489]

Thank you! Very instructive. But I don't think I will be refurbishing my injectors myself.

[@StevenBTuner]

I understand, it's not for everyone...

[@skatepark02]

Thanks for the amazing video! Question: only 2 of the 4 injectors I stripped down had the magnet in them. Is this normal? Perhaps the magnet was added in a revision?

[@StevenBTuner]

Hi, not all variants have the shim, but you would usually expect to have all the type in the same engine. Just make sure it didn't escape to the workshop floor if it was there!

[@mortenrune87]

Hi. Fantastic video 😊 Do you have a video on dismantling the top? I had to take the top off to loosen a stuck injector. No i dont get fuel out of HP pump. I am thinking this injector is not correct, so the system does not get pressurized.

[@StevenBTuner]

Not yet! All the best in getting to the bottom of the issue!

[@Escygt]

Very useful video. If you can't avoid removing the top off the injector in order to pull it out, how do you calibrate it? I had to do it and my engine doesn't idle nicely now.

[@StevenBTuner]

Hi, getting the calibration numbers is something that needs specialist equipment, so is not a DIY job unfortunately.

[@mikethompson3191]

Great video! If the leak off test shows excessive amounts coming out of 1 or more injectors can the top of the injector be stuck open? I ask because after running bad fuel with sediment I only get good fuel pressure when I cap off the injectors. Thanks

[@StevenBTuner]

Hi, it could certainly have something jammed in there causing the issue.

[@thespiderkelly9589]

Hi, very useful tutorial thanks for making. Just one question, did you have to remove the intake manifold to get to the fuel line nut on cylinders 2, 3 and 4. Cheers.

[@StevenBTuner]

Hi, thanks! The intake manifold wasn't removed as far as I can remember. Another update to the video is that most of the time it should be possible to get the nozzle holes clean by suspending the injectors in an ultrasonic cleaner without taking them apart (first block up the fuel and electrical connections).

[@caerwynpearce8527]

Superb video, very clear. Thanks. I do have a couple of questions... I thought this leak off pipe was a one way thing for recycling"unused" fuel back to the pump. If that's the case why is there so much fuel coming back down that line and into your white canister.

[@StevenBTuner]

Hi, the leak off fuel is used to cool the injectors.

[@jack504]

Short version: the low pressure fuel tank pump is pushing fuel out of the disconnected fuel bleed off lines. Long version: There's a low pressure fuel pump in the fuel tank that sends fuel to the engine bay. This pump moves more fuel than the engine needs even at full throttle, and most goes in a loop back to the tank. There is a T piece that sends a line off this loop to the high pressure fuel pump, so that it has a little positive inlet pressure and doesn't have to suck fuel from the tank. The injector bleed lines go back to the loop and bled fuel returns to the fuel tank. The bleed off pressure easily overcomes the low pressure in the fuel tank to engine loop and returns to the fuel tank. However when the bleed lines are entirely disconnected there is nothing to stop the low pressure pump pushing fuel out of the open lines, this is why his catch tank filled up so much.

[@caerwynpearce8527]

@@jack504 Thanks....

[@ismetmolaahmed8336]

Hi Steven, really great explanation!! Do you know if Mercedes CDI Injectors are similar?

[@StevenBTuner]

Hi, thanks for watching! They are very similar - the leak off test and nozzle clean should work essentially the same way.

[@ona2621]

Thank you perfect video I will try.. Over the weekend, I'm trying to make a extractor tool, any chance to find out the OD of the injector so I could make attachment to take the injector out, also does 40hz ultrasonic cleaner will be good enough? You could pick them up for £30 on ebay?

[@StevenBTuner]

Hi, thanks for the kind comment! If you made a tool that had two flat claws that were spaced 26.1mm apart, it might be quite good at grabbing the injector under the metal head section. A 40 Kilohertz ultrasonic cleaner is perfect, and for injector parts as they don't need to be very large. All the best with the job!

[@funitoo]

At the start you removed the electrical connector from the 1st injector only. Any reason why only from the first one?

[@frikkice]

Awesome video! Do you know the size of the return line fittings and what size hose i will need to make a homemade leak off tester ?

[@StevenBTuner]

Thanks! It might be worth getting a few different sizes of fishtank air hose, and seeing which size squeezes in and on. I'd love to hear how it goes!

[@frikkice]

I still need to do this😅 but you talked about switching out the plastic T fittings for brass or something like that.. do you know the size of the T fitting ? I have a 1st gen m57d30/29. Or do i have to remove mine and go looking ?

[@vtecminileon]

fantastic video. Do you know if the injectors are similar on the N57 engine too?

[@StevenBTuner]

Hi, they are completely different as the top end is piezo instead of electro- mechanical - but the nozzle end is similar.

[@gledy2]

Thanks for the video, learnt a lot as away to do it on an Audi, just waiting on my ultrasonic cleaner to arrive. Can I please ask what solution did you use in the bath? Thanks allan 🏴󠁧󠁢󠁳󠁣󠁴󠁿

[@StevenBTuner]

Hi, I bought 'carburettor cleaner' specifically designed for ultrasonic cleaners. If you mix your own chemicals it is important to make sure that no volatile gases are released that can cause an explosion risk.

[@cesarjorgemurillobarientos1813]

exellent

[@StevenBTuner]

Hi, thanks for watching!