Diesel In The Coolant? What Are Injector Cups And Sleeves? Fuel In The Coolant?

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Does your Diesel Engine have fuel in the coolant or coolant in the fuel? The most common cause of this is Injector Cups. What are Injector Cups? This video describes what Injector Cups are, how to replace them, and why there is fuel in you coolant.
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[@fastinradfordable]

I've been a top notch -car- mechanic for a decade now- and I would come work FOR you. learning how to fix big trucks is highly renjoyable

[@galenbowman6247]

We have a 1998 3406 in a freightliner, been losing coolant sporadically for several weeks now. Also ran rough for a few minutes at startup a couple times. Just today discovered coolant in the fuel return line. Thanks for steering me in the right direction. Great video!

[@geo.sackett8154]

this guy is good, very knowledgeable. thanks.

[@adamscott5175]

Brilliant videos man. I really appreciate you sharing your knowledge and expertise.

[@cedrickody1189]

instaBlaster.

[@Finnamakeausername]

Awesome video again Adept!

[@jeffsmith8066]

You need a flex head ratcheting wrench! I love it for doing Volvo/Mack injector cups.

[@louismallios6780]

Great videos. You are very informative. I am having problem, 3126 oil in diesel fuel. What are you thoughts? I have changed injector o rings?

[@sayokargbo2915]

Prefect & satisfied video,Cat ,,,keep it up

[@kerrygleeson4409]

Great work thanks for sharing

[@alexj1773]

Hey!! adept good to see you again buddy.

[@1973riyadh]

very good job and I learn from all your videos. thank you soo much... REGARDS

[@wolfgangkohler2508]

Great video. Very interesting. One question however; after you have pulled the cup and you use die grinder to clean area where cup goes, how do you avoid contaminants going into the cylinder? Also you said to clean the cylinder. That would be hard to because you have a small opening. Only way would be a small vacuum hose ? I’m fairly new to this kind of stuff so forgive my ignorance. Thanks.

[@orozcorob69]

Good info! What about when engine oil gets in the fuel tank? Could that be due to bad injector orings or seats? Engine is an isx cm870 tia!

[@ronihrke2867]

great videos, I have a CAT C7 in my motor home, I had a complete HEUI pump injectors replaced 6 months ago. Took in for a Preventive Maintenance. Went to pick up check engine, display said ECU low coolant. Coolant full but fuel in coolant, no leaking of coolant though to my knowledge. thoughts?

[@al-mubdizahir8704]

Love your videos man. I'm a aspiring diesel mechanic

[@torres6021]

Keep making videos so i learn a lot from them i love caterpillar engines 👏👏👏👏👏👌👌👌👌👌👌👌

[@edwinrecinos4478]

Tks I have head ache with my freightliner but now you help me, and I trade to fix the problem only looking for tool to remove the cup inyectors,

[@lubasiuriel1134]

Very educative information.Thanks Bro

[@jairedheinrichs2295]

Thanks for the video my 95 7.3 has coolant in the fuel and it only has it on start up when cold so I'm thinking I will have to replace all the cups

[@PoliticalGangster]

how did ya cups replacement go?

[@dustinh8952]

How hard is it to remove the spacer under the valve cover for more working room?

[@tonycastelli3350]

Awesome video👍🏼

[@madratter]

Excellent video. Thank you. I'm not a mechanic but I do need this info when talking with my very skilled diesel mechanic.

[@edwinfuchs3887]

What’s the easiest and best way to plug the injector tip hole to prevent debris from falling into piston? Working on a 3406

[@arisali9814]

thanks .good job

[@stevosprojects7123]

Do you have to reprogram the injectors I recently replaced the cups thanks to youre video but now it is missing not sure if you have to program them or something

[@BlakeMerckleTrucking]

Was just quoted 3500 plus tax to do injector cups on my c7 is there something I'm missing I expected cat to be a little more expensive but that sounds crazy high

[@codystewart2575]

So is it possible to get fuel into the coolant through bad injector cups on a mechanicaly injected dt466... the injectors have no o rings just the copper washers I have no compression gasses coming out from the injector body on the outside of the block.. just wondering if it could still be injector cups or would you lean more toward a cracked head or something

[@michelreineking8284]

I have a C7 with a 94-1 code. Low fuel pressure. Shows about 4 psi at idle, I've hooked a guage to it and can confirm the low pressure so it's not a sensor problem. Bypassed the truck completely with a jumper line and same thing. Changed the filters and lift pump. No fuel leaking from injectors from what i can tell. I'm surprised the engine even runs on 4 psi. Any idea what may be causing this?

[@arthurvilla898]

I have a cat 3406b engine that's leaking water around the spraying nuzzle have any idea of what can that be ? THANKS

[@garycarroll9447]

I wonted to see the o ring do the o ring go in before the cup or after ? Video is grate

[@robertfournier3549]

I have coolant in the primary fuel filter but no fuel at all in the coolant recovery tank. Could anything else possibly be putting coolant in the fuel filter? 1998 C-12. Coincidentally I turned on the faucets for the heater core and one day later I had coolant in the filter.

[@marcusmcnutt891]

I've got a C-15 6NZ fuel coming out of the blowby tube is this injector cups ?

[@forsakenfewful]

Great video!

[@hermantoofa1868]

Thank you for this vidéo , i have same problem some diesel in my radiator on my volvo genset TAD734 GE.i think the problem is the injector sleeve or o-ring. What do you think?

[@josephfeoranz1029]

Hi I have a 1994 3116 and it dumped my entire tank of fuel out of the coolant overflow I can’t find a tool to pull the injector sleeves for the mechanical injectors can you tell me what tool I need? Thank you

[@kjkalm2198]

u and your videos are great ,keep going.what causing fuel mixing with oil, and oil mixing with fuel thanx a lot

[@AdeptApe]

+Kjk Alm I've got a video on fuel contamination also known as fuel dilution. It is usually an injector.

[@corybell1255]

Thank you for your video

[@vcmedia2970]

hello the 3125 marine engine does it cary a orange inside the chamber for the injector sleeve cup .need your help here ASAP my coolant is mixing with oil I replace the sleeve but it still leak

[@80sriceman]

This just happened to my 2002 GMC 6500 with CAT 3126. Truck had a hard time starting, once it did, I noticed the overflow bottle filling up. Waiting for mechanic, hopefully just the injector seals blew.

[@derrickvail4110]

First off great videos. You've helped me a ton. I had this exact issue on my western star 3406. I did every per your video. Mine differed a little in the sense that it has two nuts to be remove from the jake housing and there's two connects that run on top the top of the jake housing and clip in and says torque to 10lbs and had a snap ring. But my issue is after replacing the cups and flush/new coolant, my driver went to start the truck this morning and it attempted to start just once. I just got here and it made no attempt to turn over, the only thing it did was a loud audible Thud or slam.

[@derrickvail4110]

Correction. The driver said it never attempted to turn over. It was only a loud thud or slam sound

[@AdeptApe]

+Derrick Vail Sounds like you have fluid in the cylinders. Did you evacuate the cylinders with a vacuum pump? If you didn't it is okay you'll just have to slowly turn the engine by hand until the fluid is pushed past the rings. Did the engine run after changing the cups?

[@derrickvail4110]

I did not try to run it because it was late and didn't know if the sealing compound needed time to set up before running

[@andireimer]

i dont know how people can dislike ANY of his Videos!😠

[@AdeptApe]

+Chess tradamus I've got a few dislikes, but overall people are pretty positive on here.

[@adriana.garciabustos4609]

Amigo en español

[@adriana.garciabustos4609]

Esta interesante

[@mdbadalmiah6808]

Thank you sir

[@ninotexas]

I just had mine done and it seems there is a little residue or there is more fuel in my tank. Is it possible to have a small amount of fuel residue? They just drained it and refilled. Didn’t flush system

[@workingclass6750]

How do you ensure all the debris is out aside from compressed air?

[@vcmedia2970]

hello the 3125 marine engine does it cary a Oring inside the chamber for the injector sleeve cup .need your help here ASAP my coolant is mixing with oil await your reply thanks

[@aldomack4963]

Great video

[@patrickfraney6832]

I am getting fuel in coolant. White smoking a lot and smells like raw fuel. Loosing about 3 gal of coolant a week. I pulled all injectors. #2 looks discolored from heat. The bottom injector cup o-ring is mostly missing from #1&2, I haven't pulled the rest of the cups yet? Can missing o-rings cause my problems? I'm thinking I may replace #2 injector and all injector o-rings. Thank you

[@isofwssam5300]

Thank you good job

[@arturliepins9821]

Just strated to repair CAT D5N with same issue, at the start I thought crack in head, then remebered bad cold start on CAT 962gII - and bingo we got bad sleeves and O-rings.

[@Inspironator]

Great info. I wish I had a C7 in my F250! :))

[@AdeptApe]

+Inspironator They are a simple engine but are quite expensive.

[@thatoneguy7416]

Im doing this job on a c-15 acert right now. Does anyone know the part numbers to the tools that pulls and installs the cups?

[@user-us4bu4uq5s]

Thanks

[@tonyschroeder5881]

So I'm getting some coolent in the cylinder but no compresson inton coolant system could a failed cup be the issue? 3406e 5ek

[@jaarryifleshblood315]

Do 2 stroke desiels have cups?

[@falarinc5165]

Where do I get the tools from

[@MrBigR928]

Always so calm and cool you are! I like my Mechanic to be mellow. I dont want my mechanic sweaty and looking side to side shifty eyed and fidgety when i come to pick up my W9...lmao. Good stuff Adept as always 😎

[@AdeptApe]

+Big R Phillips lol, you can pay in cash or meth, I mean cash, I mean aaahhhhhhh.

[@cortransport]

Adept Ape lol

[@MrBigR928]

@@AdeptApe 😂

[@westtexastll1978]

@@AdeptApe 🤣🤣🤣🤣🤣🤣

[@westtexastll1978]

@@AdeptApe I know this is an old video BUUUUUT I am just seeing it... Could anything else cause fuel in coolant besides injector cups?? I don't see anything looking like a heat exchanger type "fuel heater" (similar to the oil cooler) for a leak to happen... My bet is the mechanic being in a hurry sliced an O-ring when installing new injector cups. 👀🤫🤣😭🧐

[@00Blqze]

Can you please make a video on electrical troubleshooting

[@parradobusiness]

Good video.

[@tjdup3082]

i don't understand how coolent couldn't get into the oil also if the orings were bad?coolent coukd push out up top then into the oiling system?

[@delvincuffy4142]

does the c10 injector cup carry o-rings?

[@robburton8690]

Where do you get that style puller

[@dowingfaith]

Is the c12 the same? Great vid .Keep them coming.

[@Jerzeyguy]

dowingfaith yes.

[@melvin1276]

Numero de herramientas para extracción del cover injecctor

[@user-iw4cm5pt1g]

What tool are you using I can’t find one that expands inside of the cup anywhere just tap in

[@onionpeeling5822]

Hard head if you got regen engine then he stop there !! Why ?? Can u pls explain ? It was the best part tho.

[@robertohernandez4385]

My fuel return line is so hot. My engine is giving a hot temp sensor read. Can the heat be related to the injection cups needing replacement? I'm in a blind here. Dont just wanna do r&r service. Can anyone help

[@edbemica]

Great, in my case it was coolant in the diesel system, but the same problem. 3126 Engine

[@darkoilievski4015]

I have a problem with my audi a3 2005 2.0 tdi 140ps BKD engine 16v. Its loosing coolant no leaking, people tell me that the problem is the head gasket or the head engine, i have oil in my coolant system, please help ? Fast as you can... thanks

[@amirshaikh2303]

Hi facing same issue in skoda Fabia, what can be the solution

[@Ecoscienceczar]

I'm getting coolant in my diesel. Will injector cups fix this?

[@sahjadaahmad8109]

Our benz tipper water separator filtre lower portion coolant show please resons damage of parts

[@nulinetransport12]

Great Video Thanks ! I Think my 3126 might need those done after it overheated,do u recommend to do the injector o rings as well?

[@StephenCoxfixit]

NuLine it's good practice to always replace the injector o-rings any time you pull the injector out.

[@nulinetransport12]

Thanks i will Do

[@hamadhoucinecaterpillar6164]

Awesome

[@malachij7026]

I have 97 freightliner century with a 3406E. I just replaced my injector cups and injector rings. Flushed the cooling system, filled with 50/50, crank the engine, turned on my lights and it was running great. Then the engine just stop. Turned off the ignition, turn ignition back on and noticed that the gauges did not cycle. Turn the key to start and the engine fired up just fine, but none of my electrical gauges are working. No wipers, no ac, engine fan running constantly, windows won’t roll down. When I turn on the headlights it kills the engine. Also noticed when I try to roll down the windows it cuts the engine. Please help! Any idea what’s going on?

[@makincash3337]

Is there a test to determine this?

[@williamsveliz6529]

hi my name is jose and i have a problem with my 2005 dt466e international because i change all 6 injector but now my ICP sensor and my IPR sensor are going bad all the time and i see that the oil in the engine is too light is like diesel in going to the oil can you help me please

[@joelgonzalez6941]

Very good work helping driver and mechanic how i can send a donation

[@user-jt8yx9ik5e]

I have a cat 3114 engine when accelerate like circle smoke coming from exhaust what is the problem?

[@jamsatsolutions4479]

💯💯💯💯…..where can I Purchase the Tools that are Needed?

[@trubz360]

Thanks for the video. I have to do this to a Detroit 60 series 14 L engine is it pretty much the same process or do I have to remove the cylinder head for that specific engine

[@carmello000jp]

I'm doing mine tomorrow

[@johnberry9669]

Depending the year older truck where not removable replace head unless you got a great local machine shop

[@asafegous]

Francisco amaya just did a replacement sleeve video on dd engine. Very similar

[@user-mz5dd8lp9e]

it's helpful.

[@FCM1klk]

Can a bad injector cup cause fuel mixing with oil?

[@mzee5533]

awesome

[@NitishKumar-wd9hm]

Munchies

[@ephraimpalces4336]

please post a video on CAT 3412 engine

[@Johnwilliams-yi9xc]

just a question after doing a job like this is alright to start it up or is their something special you have to make sure you do before start up?

[@firstname6208]

make sure there is NO liquid on top of the piston before you install the injector. law of physics you cannot compress liquid. the weakest link will give out- bend a rod- lift an injector- blow a head gasket..

[@michelleguerrero2516]

where can i get that tool

[@andersonbarbosa1990]

Hello, it is possible for a company to hire a mechanic with h2b visa I await your reply

[@842Cwalker]

what are the part numbers for the removal and instillation tools? or where can I get them?

[@elperrolos1]

Did you ever find the part number ??

[@jasonvos3956]

I have a 1995. 3116 in a topkick. It's got a miss also and hard cold start with a bad miss and really heavy fuel smell and white smoke on start up. Runs better cold but develops the miss as it gets warmer under load. Is the cups a culprit?

[@user-jp7rk1uf2n]

It is hell on your body.

[@maximooropeza7580]

6nz that the engine shuts down while driving and loaded. Any ideas on what can cause it to shut down.? Does not have any codes.

[@AdeptApe]

+maximo oropeza Check the key switch voltage going to the ECM or possibility the ECM itself.

[@blackbulletdiesel4742]

On my c15 6nz I got fuel in the coolant in the radiator but I have a lot of pressure in the radiator I open the cap fuel and coolant everywhere is it possible the head is cracked

[@samuelaboli7364]

Probably caused pressure leaking in between the cylinder head, remove for pressure testing to abstain the issue

[@davidstojkovic3546]

what if youre getting oil in the coolant ?

[@racquishb]

hi what is the name of the removal tool for the cups or where can i find this tool please thanks

[@covid-19ispsychologicalwar10]

racquishb riffraffdiesel makes a tool you can rent

[@alserrano5140]

Hi I just replaced the cups on my injectors. Now when I start the engine has no power and black smoke out the exhaust. My original problem was that it mixed diesel into the cooling system. Any thoughts on what could be happening??? Thanks Al

[@berkley9437]

Al did you ever find out what caused the no power and black smoke out the exhaust. I'm having the same issue with my truck after changing the cups.

[@alejandroyonet2010]

Hi, where can I buy these tools?

[@1HSYURIDIA]

How do you know the diference when diesel in coolant or oil in coolant ? Mine looks like has some of that but very few little like black points

[@Jeremy-iv9bc]

Smell inside your surge tank. If there is diesel in there you will be able to smell it.

[@eddietorres4005]

Good afternoon, I’m a local mechanic down in Houston TX. I have a 2005 Twin Turbo C15 CAT. I want to know if it’s possible to replace the injector cups without having to remove the heads ? Any information would help. Thanks

[@AdeptApe]

Yes, you can definitely replace the cups without removing the cylinder head, unless the cup is broken in the head.

[@donmunro144]

On the 3406 these will cause coolant in the oil, as these Don have a common rail fuel system

[@michaeldominiquez7253]

What with this cost to fix on a 350 Ford