How To Make Your Cat C7, 3126, or C9 Bulletproof. HEUI System Upgrade.

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The Cat HEUI engines work great, until they don't. This video describes how to increase the reliability of these engines.
Donations to the Adept Ape Channel can be made at [e-mail]. Thank you for watching.

[@speedandmarine9066]

If you do have a HEUI pump failure it's a good idea to pull the end plugs out of the oil rail in the head and clean it out so you don't get any metal into the injectors. Usually, if there is even a hint of flake in the oil when I drain the head, I do injectors and the pump as a set to prevent any future failures. Seen a lot of HEUI pump's replaced and few weeks or months later it's back getting injectors. Excellent videos, not many people take the time to thoroughly explain some of this stuff and even a lot of dealer mechanics don't fully understand them!

[@FILTHY-MANGO]

And another great KZbin clip. Thankyou from a Cat technician here in Australia. Keep up the good work.

[@kylegriffis7636]

I work on school buses with c7s we just started getting the Heui pumps with the inline filters now. Sucks every heui oil line has to be changed over now. But hopefully we won’t be changing out pumps as much anymore. Great video

[@ancientsage8852]

I have a 2006 Thomas Freightliner School Bus with the C7 ACERT Diesel. This gentleman is a LIFE SAVER. Phenomenal insight and impeccable delivery. Thank you! 🙏🙌🫡🤝

[@bospze12]

Josh just want to thank you for this great information.... so often lots of videos are done by hacks simply because they want something up on you tube.... your a professional and that makes a huge difference....

[@AdeptApe]

Thank you, I get a lot of comments saying I'm a hack or not even a mechanic actually, so I appreciate the kind words. I never claim to be the best mechanic, but I'm a decent Cat mechanic.

[@bospze12]

As a Chief Engineer (unlimited) marine engineer working ships for nearly 25 years.. Ive worked with many different engineers... some can talk the job and know all the specs, capacities, flow rates etc... but when you hand them some wrenches and say go fix... they fall apart... You have to do the job and realize you dont know everything... this way we learn our lessons... so screw others opinion

[@davidwells9342]

Thanks for the added detail and part numbers this is been a big help

[@MiguelGarcia-nl3ci]

I've replaced that oil supply lime with just removing the power steering pump and the power steering adapter to the air compressor

[@alexdisla253]

yo adept ape thanks for all the education i,m a diesel tech and all that info has helped me one way or another

[@redman2751]

Thanks for the video. I've worked on these as a tech but not a lot. Now I'm looking at buying an old RV with one so doing some research and found your videos. Appreciate your info. Will help me and possibly some of my customers as well.

[@cwj9202]

Great info Josh. I will alert my foreman about the issue, as we have a 12M2 motor grader powered by a C9 and a Sterling emulsion sprayer truck powered by a 3126. Thanks!

[@jeralddegraw6069]

This Guy is WAY Good ! I will do the Amazon thing, but also contribute directly :-)

[@leroykees1170]

Just love.the info on the 3126E motor.

[@mrnobody8540]

I was just thinking of that oil filter mod... Great!

[@eriks836]

Great video! Thank you for this valuable information, i own a C7 and will be conducting this upgrade

[@benlong1591]

Very well put together! I am a new fan!

[@billhowe4863]

Great video, I have an 05 mandalay bus freightliner chassis with a c7 that has a failing heui pump to fix, it'll be getting the updated kit with the filter

[@TA1199]

MY oil cooler was leaking back in 06'. Had it rebuilt no issues with the HEUI pump, thankfully. I have 621,000 miles on a 2000 Freightliner FL80 with the orginal 3126 motor.

[@AdeptApe]

+TA1199 That is almost 3 times the recommended run life of that engine. You must be keeping up on maintenance and not mistreating it.

[@thethomasj1795]

Adept Ape I baby it and, the loads I pull normally aren't heavy. However when I have a heavy load on it 12000 to 15000 pounds it pulls it fine. It seems to run better after it works out. I am the only one who drives it.It doesn't burn oil. Very little smoke on a cold start. I keep it plugged in when the temp get below 40*. Oil changes every 6500 miles and I run Howes fuel injector cleaner nearly every fillup. Speaking of fuel. I get over 10 miles to the gallon.

[@stevebellows7314]

@@thethomasj1795 what type of transmision? 6 speed

[@thethomasj1795]

@@stevebellows7314 yes.

[@stevebellows7314]

@@thethomasj1795 I just bought one runs like a top... changed the oil with rotella today. 285 k in Engine 6 speed Spicer tranny Need to clean rail injectors just to know there ok... what's your secret

[@jhananut]

the most important thing to do is replace the oil and filter every year. It is very hard to work on the 3126 in my RV (I just replaced the exhaust manifold gaskets) - there is no room. A school bus would be a lot easier. So I'm not tackling either of these job unless CAT announces a recall.

[@Agislife1960]

Maybe use a piece of glass with some very fine sand paper, put a little solvent on the sand paper and push the face of the oil cooler adaptor plate back and forth on the sand paper until it's flat.

[@Ratkill9000]

Surprised International got these right with the T444E/Ford 7.3L PowerStroke.

[@softfinesse9673]

Thank you Sir for your great videos.

[@jeremyeaker7362]

Great video! I really liked the advice you gave jpaydirt on his C15. I was wondering why there is no engine brake for the 3126B? Keep the great videos coming.

[@johnricciojr.5324]

I have all 3 & thankyou because caterpillar won't call to tell this

[@Tregaskis47]

Our 'new to us' 2007 Cheetah is powered by a 2006 Cat C7 350hp ACERT engine. Cat recommends their branded 15-40w oil for warmer climates and 10-30w for cooler. We just purchased the coach and are concerned about the HEUI pump issue so are making the mods Cat recommends to 'solve' the failure issues. My question involves people's experience with the newer tech synthetic oils...specifically Valvoline premium blue 5w-40 and Rotella T6 5w-40. They are less expensive than Cat and would seem to offer a solution to all climate needs. I am going to change the HEUI pump and add the inline filter and reseal the oil cooler just for precaution and am inclined to use either of the above oils but would like some historical reference to work from.

[@glk1djs]

Thanks!

[@lolman-vv7mw]

Hello from pon equipment sweden

[@turbopumpen1031]

lolman321 NEIN IS ZEPPELIN NOW

[@deddie4645]

I've done this many times in my life for such situations I get a big piece of Emory 600 maybe 8 by 11 and put it on a piece of glass..... this is the important part find a nice television show have a 12 pack of beer beside you and just keep beer sending it.... you will know when it's done when you sand it and it all turns out correctly no high spots no low spot...... I've done this so many times when I can't shim a gear or I can't get shims 1 -3 hours on glass in a thousands thinner........

[@AaronBeihl]

I would appreciate it you would do a video along the same lines for the cat 3116. I own a truck with a 3116 and want to make sure I am doing the best I can for it.

[@lanceroark6386]

There should be an adapter for the injection pump from 3306 to be bolted in place of the HUEI.

[@mikehael6852]

We have 2 dump trucks with c7s and Allison 6 speeds one is night and day difference power wise. So we did huei pump on my slug no difference. No engine codes runs perfect just has half the power.

[@johnnyd1557]

Thank you

[@ProgressWithEveryStep]

Hello. I really enjoy your videos! I have a 3126B in my small dump truck. I’ve had it for a number of years, and have always wanted it to have an engine brake. It looks like there are pac brake and Jacobs exhaust brakes. Do you know if there is also an engine brake for theses engines. Can you speak to the pros and cons of theses options? Thanks again for taking the time to make and post all the great videos!

[@JonesALB]

Hello brother congratulations for the videos of the channel. I am Brazilian and work with heavy machinery mechanics. I've got a c11 cat, which is losing power. This engine has no fault, except for one related to the atmospheric pressure sensor, but has already been corrected. We're analyzing the turbocharger,but apparently there's no problem with it either. You should know that the injection system is THE MEUI. What problems can this engine present?

[@gonzaloperez3501]

can oil sludge on the heui pump cause the internal solenoid to stop working? is it possible to clean it and re-install it?

[@RandomsFandom]

Get a really nice double cut fine file and gently rub it across the surface to plane it better. A thicker file from a top grade company will true up that face... that or a sheet of glass with sandpaper superglued to it... these are both rather planar surfaces that are very abrasive

[@AdeptApe]

My Technical Communicator at Cat does this with the file and recommends it as well. Glad to hear he isn't the only one.

[@RandomsFandom]

Adept Ape rub the file in circles/8’s gently. You can get a tempered glass strip from printers/fax machines. I can’t remember

[@ivanfontaine8855]

Hey guy.I see there is a filter sysem that goes between the huei and the injectors. Im wondering if that would be a good idea or is that just more wear on the huei,by adding more back preasure to the huei?

[@mandiocapowergp]

Please do same video for c12

[@jonodevambez4400]

Hey man I really appreciate all your videos. I have a cat 3126 in my freight liner water cart truck and I have just done a fair bit of replacing old parts with new like water pump, radiator, rebuild the turbo... I found that the waste gate actuator was not working, I tested it and air was coming out without pushing the rod. My question is at what psi should the waste gate open so I can replace it with an aftermarket one.

[@michaelmcfarlin14]

Can you put that filter on the 3126???

[@rodrigopacheco6864]

good morning. I would like to know what the difference is between a C9 engine for vehicular use and one for heavy machinery.

[@matts_.4494]

How much does it typically cost to get the high pressure oil line replaced and an in-line filter for the HEUI installed?

[@gilbertozelaya7621]

Gracias buddy

[@AdeptApe]

Thank you for watching.

[@johndoe-nk4op]

cost from cat for mod parts is $328.62

[@ricosbladeify]

Hey sir been following your videos (best videos out there)I have a 04 KAL30004 C7 I started by reading the flash code (learned on your video) I got the following 3-9. 5-8. 1-5 Called cat And they lectured me on using Flash codes and that I should just use cat ET but I think the Flash Code are just fine. Based off the codes I decided to get the IAP SENSOR And the Fuel pressure regulator. Tried cranking it crank crank but no start check the fuel pressure where the fuel filter is read well over 50 psi. So then I pulled the valve cover didn't see any of the injectors abnormally leaking pulled the injectors inspect the O rings O rings still look new ( replaced 2 months ago) So now I wanted to drop the oil Pan to inspect if cooling is leaking into the oil so I drained the Pan didn't get all the oil out So I check the dipstick and the dipstick is still Reading full. So confused at this point the oil on the dip stick looks new and smells funny (like coolant ) while the oil that was drained from the pan black....still very confused please help I will donate if given guidance Thanks Rico

[@btlandscapingmowing1778]

What the part number for the filter line kit for c7 thank you

[@benlong1591]

I am a snow cat mechanic and have a c9 that bogs down going uphill under a load. No codes insystem. What are the best ways to test the turbo? Or any other suggestions?

[@utoobrandomness7197]

Dunno if you'd need to do another whole video, but Yea... any remarks on the 3116 & its pinch points? =)

[@deant876]

Is there any symptoms to look for if you have a warped oil cooler besides tossing HUIE pump/injectors?

[@WorldsOkayestFarmer]

*Thanks for the info I have two of these engines in my dump trucks just had to replace a Huey pump* #WorldsOkayestFarmer

[@zpwslayer9719]

Who came here from Deboss Garage!?

[@camoking5059]

I know I did 😂

[@DalePGatorcq]

I wish, he would at least reply to some of the questions posted. Then maybe this would then be a better quality Video / Instruction.

[@Tregaskis47]

He replies to a lot of them...if the 'REPLY' below the question is as dark as the text in the question, there is a reply. Just click on the REPLY and the answer will appear.

[@njlarry100]

What year was video made? Would be great to see video showing filter uppgrade installation.

[@Lucky4wd4840]

Enjoy your video's! Will the update filter kit work on a 2003 Peterbilt 330 with 3126 that has the sq HEUI pump?

[@Rprecision]

This is a pretty old video, is there any updates for the 3126?

[@kennethbullins445]

The oil filter level (CAT-1808) on my HEUI C9 engine was 4 inches below the top of the filter on the last oil change. I reinstalled empty and removed again after a 180 mile round trip. Again the level was 4 inches below the top of the filter. Oil start-up pressure is 125 PSI, sequentially I've installed an oil heater for cold days. The HEUI pump doesn't like high or moderately high oil pressure under a high load. Until the engine coolant is 205 F and oil temperature/pressure is below 40 PSI is the HEUI pump is in its operating parameters. What's the pressure for the oil bypass valves to open? And why two bypass valves, top and bottom? Thank you for your channel.

[@daltonshaw3317]

Is it possible to get (only) the updated huey hose with the inline filter ? Without buying the new pump ? Preventative maintenance only !! Thanks 👍

[@alexspurling7238]

Hey adept ape... I love learning new things about cat engines on your channel! I myself am a certified tech at a freightliner dealer so I work on mainly Detroit and cummins engines. Although my favorite engines a cat! I was wondering if there is still a way to get certified to work on cats without working for a cat dealer. Maybe online? There are only a couple techs at our shop that are certified on cats so I think it would be an advantage for a younger tech like me to get certified on them. Please let me know, thanks!

[@cwj9202]

Go online to individual CAT dealerships and inspect their class catalogs offered to outside techs. There are classes you can attend. Not cheap though - about $350 a day.

[@unknowtin1621]

U are Number 1

[@ericholbrook7723]

My mechanic didn't understand the media number.... Is there a part number or anything of the sort I could provide instead?

[@manuelserrano9857]

I was wondering if the government cat Diesel engines found in a Lmtv 1079 military trucks benefit from the same information you give about a civilian version cat engine? I purchased one to convert into a expedition style rv. I would appreciate it if you could answer my question so that I can pass this great information to a mechanic. You see, I am a disabled veteran and my goal is to take my wife and I cross country in this vehicle.

[@cwj9202]

That would be Yes, because that CAT engine is a C7.

[@ovidiofs1]

I asked to my dealer but this number doesn't exist, is there any other thanks great video...

[@jeffreymazurowski8166]

So I just installed this inline filter today How often am I supposed to replace the filter? It seems like it will be almost impossible to change it with the air compressor installed.

[@MrLangosta18]

The filter go inside the supply line ? Where go ?

[@rriquelmy3522]

More pictures please

[@fuelsquezzer2000]

Iv got a 99 Tiffin Allegro Bus with a 3126B with a Bullydog inline tuner... I love it but I bought a 2004 Newmar with a C7 Acert... Will it inter change?? 9:02

[@LuckyBullet77]

Ape, what if I have a c7 that has boost issues and suspect waste gate problems. Does Cat have replacement waste gate? Or do I really have to buy a new turbo? Because I'm a Cat parts guy that used to have you working in the building that misses you like crazy! Best regards your former truck shop parts guy!

[@Franklinchigumba1989]

I also have problem with c9 cranking but not starting

[@a.b.5925]

Hello, don't know if you still respond to these posts but I will try as I need some knowledge about my c7. I bought a 2006 f650 , 26' box truck with a c7 motor in it. I do not know how to service it. I don't even know if the large plastic reservoir is for antifreeze or if it is some kind of fluid for the smog crap on a diesel. I had a stalling problem that turned out to be a low on oil problem when I first got the truck that cost me 2000 to find out and 3 mechanics ( so-called ). I never thought to check the oil as it had just been serviced before I bought it by the PO but that was the problem all along. So after having a new injector pump put on for no reason among other things, I would like to have a better understanding of the motor so that I can avoid this kind of problem in the future. I am suddenly leaking fluid from the bottom of the ac condenser ( I think) that I had thought was just condensation and I also found a puddle under the truck that may or may not be antifreeze but has no real odor but has a slight oily feel but is not oil. I need to familiarize myself with how to service this truck before I destroy it. A little help would be great! thanks---

[@scarter176]

Gonna have to lap the oil cooler ?

[@86Lebowski]

Those dogs look 😁. Was it walk time? Peace

[@robertritchie1216]

Just a suggestion after telling you I appreciate your videos. When you give a part number or bulletin number could you repeat it so we get it right. Keep up the good work.

[@AdeptApe]

+Robert Ritchie That is a good idea, I should just put it on the video description as well.

[@giovannyl5p433]

Awesome video thank you for sharing your knowledge and DD. I just bought a 06 gmc 6500 with a c7 and 17,600 original miles. Do you think I'll face any of these issues with this low mileage? Should I address them?

[@dmotorparts2940]

How's it run 2 years later?

[@sebialex2228]

Thanks I found the video! Could I get some part numbers or can you check if this is the right one, just the kit without the huie pump Elbow 439-1889 Hose 503-7469 Filter 503-7470 Also is it a good idea to instal a oil heater inside the oil pan, where I live, winter nights are pretty cold, it could dip below -35*C or -31^F Thanks!

[@GrandSport340]

Would it be possible to post copies of the documents you mentioned or is that not allowed by cat? If you need someone to host them let me know.

[@robertkeelor2078]

Is there a way I can ask you a question? I am in dire need of a second opinion.

[@bobwhite3777]

I think cat should jump back into the tractor market. I know they make a few that I know of but I think they should try to compete with John Deere like they did in the good ol days

[@adamtheheavyequipmentmechanic]

they would but there is just not much money to be made in the agriculture market. construction is more company owned equipment compared to farming being individual owned machines.

[@phtevenmolz5030]

TheOtherWhiteBread0 read through the earnings reports for the equipment manufacturers. Construction equipment makes a disgusting amount more. They sell world-wide and don't forget there's whole countries with little to no agriculture and only construction. Just because a few states have a mainstay in agriculture doesn't mean ag reigns supreme. Also, those states with massive ag industries still have construction. You always have construction, but you don't always have ag.

[@MickGallJr]

Stephen Molzer if it matters Stephen. Is right. You don't think Cat has looked at Ag? They are a large company out to make money. If they thought they could they would.

[@SkyHifilms281]

How’s it going Adept Ape? I just started watching your videos and they are very helpful. I’m from Houston Texas and I own a C6500 with a 3126 CAT engine. I put a few gallons of gas in my truck. It didn’t make it out the gas station. As soon as it started losing power I turn the truck off. I drained all the fuel and refilled it back up with fresh diesel. It cranked right up and I left back to the warehouse . The truck doesn’t go past 30mph and it starts hesitating and blowing white smoke when I start pushing past 35 mph. I been driving it like that for about a week now trying to push out that bad fuel. Now I’m starting to worry. What do you thing from your experience?

[@Tregaskis47]

Just purchased a 2007 C7 powered Safari (2006 chassis). I have been reading horror stories about fan bearing failures on these engines mounted with rear radiators (like mine). Have you done a video on changing the bearing?

[@AdeptApe]

+Greg Yancey The fan bearings did fail a lot on the C7S serial number range, but you probably have a WAX, SAP, or KAL serial number and theirs rarely failed. You can change the bearing out on some models or the whole fan hub out. Some have grease fittings you can grease as well.

[@Tregaskis47]

Thank you...yes, I have a WAX serial number....whew. I will check for a grease fitting on the hub too. My coach has a maintenance record that shows oil and filter changes about every 9k miles....we just did a 2300 mile run from the dealer in Houston to our home in Redding, Ca and the oil still seems to be clean and we didn't use any...in your opinion, should we change the HEUI pump and install the inline filter kit for precaution or did Cat make enough changes to the WAX series that just the filter kit is necessary (or not?).

[@hakunamatataadventurebus5944]

Mr. Adept Ape, I'm looking at buying a 2002 school bus with a cat 3126 with 220,000 miles to convert to an RV. The engine fired right up and idled smoothly. With a cold engine (Miami FL 80 degree day), there's some blow by at idle visible with the oil fill cap removed. I'd call it mild amount of smoke/vapor with no force. With my palm over the opening, I could not feel any pressure or pulsation. Can I get your opinion on the condition on this engine based on this little information please? I really appreciate all comments on this. Thank you!

[@AdeptApe]

+Steven Vaccarello With that much information, I can't give any sort of opinion. When it comes to blowby, you need to measure the volume not the pressure, without a Blowby meter there isn't a good way to tell. There is obviously too much visible blowby on some engines, but if it looks like a similar amount to other engines it might be okay.

[@mikegamer6104]

To test the heui high pressure on a 3126, do you take out the iap sensor and use that port? What should pressure be while cranking? I have a crank no start issue 99 freightliner . Changed timing sensors already. No codes, tach reads zero while cranking also when on either no tach, check engine light comes on with key so assume ecu is getting 12v. iap solenoid may also be bad is there a way to ohm it? Thx for videos you’re a genius!

[@gunks_getaway]

20R6642 is the inline hose AND the pump. Do you have to replace the whole pump?

[@ManuelGarcia-y9k]

Hi I purchased a1998 GMC T7500 with a 3116 cat it dose have a HEUI system on it I was watching your video on some of your stuff. I ran the truck was worklng good but now it won't start can I call you and pick your brain?

[@dominicg1237]

Hey Adept Ape, can u make a video on how to get a job at caterpillar?

[@joshseigel]

easy go to school get a diesel certification and apply all shops are looking for new techs

[@tommylillie9622]

I followed the instructions and got a job at cat to 👌

[@thetowndrunk988]

I know this is an old video, but just out of curiosity- were the injectors in these systems prone to stiction, like the 6.0 Ford Powerstrokes?

[@markgarn1843]

I have my own small business that we own several diesel trucks. Cat 3126, C11 international Dt 466E and 1 Cummins. Ca Can 1 scanner commicate with all my trucks? 7:13

[@radiatahiri6011]

Where can i buy like those please

[@StevePhillips76]

Did they make that filter/line kit for the c9 as well?

[@scarter176]

Maybe cut an oring channel and Oring it ?

[@scarter176]

Josh, how do you order just the supply line filter hose with filter sans the HEUI pump ?

[@dakotatilley4108]

Hay man

[@parexc07]

But how does the chrome come off the pump... from dirty oil? Or moisture?

[@classiccarsbreaking]

I'm about to fit a HEUI pump to a C9 engine, I plan to fit a remote Oil filter on the intake Pipe to the HEUI pump, am I right in thinking this is a good move?

[@satpreetsingh1780]

I have freightliner M2 with Cat C7, it was smoking bad and low power when I bought, all injectors were bad so got those changed. Power is OK now but smokes a lot when start up, runs rough till water temperature hits 150, once water hits 150 on temperature,smokes reduces a lot and runs smooth. While running sometimes exhaust gives blue smoke puffs, startup has mixed smoke white and bluish. Please suggest what can be cause to this!

[@GDTRUCKREPAIR1]

Can I pay you for your knowledge? I'm stuck on my 3116 not starting. Heui pump only putting out 3200 psi and not starting. New iap valve new iap harness and still not fixed.

[@DA-ig8cy]

Hey what are your thoughts on aftermarket turbos for these c7 engines???

[@butchcassidy5398]

ADEPT APE what would be a good replacement engine to replace a 2002 3126, in an F650 what would have higher rev line more power an be more durable then an 3126

[@asokanarajun1859]

C a t c15 engine.no starte engine.. jame no moving after one round moving and starte after exaust manifol outside water also coming why?

[@Ricedad]

any updates on the huei inline filter for the 3126 yet?

[@robotricks8787]

Cat c9 I installed new actuation pressure sensor after installing it started normal but after 15 minutes it stopped and now it won't start and no error codes are there but maintenance light comes on Also i removed the actuation pressure sensor and cranked but there is no oil pressure

[@leroykees1170]

Have a question about the oil.xooler on a 3126. Can someone build.a.rote.oil.filter system with external oil cooling radiator?