REVIEW: Everything Wrong With A 7.2 CAT 3126 Diesel

What could possibly be wrong with the 7.2 Caterpillar 3126 diesel engine?

Cat Diesel Engine Explained! Here's everything you want to know about the Heui pump 3126, 3126e, 3126b CAT series diesel engines that came after the 3116 and before the C7. #RichReviews #EWWengines

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[AdeptApe]

Thanks for the shout out sir. Pretty in depth video you made here on the good old 3126.

[nomebear]

We used them for onboard generators for light ship duty. A caveat: When a ship is totally dead, no juice in the batteries, we used a hand started single cylinder air cooled diesel to charge the 24 v batteries. Once charged we could start this small cat to run the compressors, thus the large diesels were started with compressed air. Once this little Cat was running we had lights and ventilation. To hear it start up was pure music to some hot sweaty engineers.

[Sarphendon]

I don't think I've seen that much energy from Rich as I did in that intro.

[alexanderjohnson]

When I worked at international if you wanted to enable the 6th gear in the allison you would have to bring the truck in and fill out a request form with all the specs on the engine and drivetrain to check the calculations to ensure driveline speed wouldn't be exceeded by the addition of the 6th gear as well as adding a max speed limiter. Once it was approved by engineering the request would be sent to allison to create the program and reflash the tcm enabling the 6th gear. Was around a $600 charge here in Canada.

[thesilkymitten]

This has to be your best engine review yet!

[lernwithgern]

Got one of these on my wood chipper. Think I'll change the oil tomorrow.

[daveerald]

Gotta love that the "everything wrong" list is only two items, change one line and change your oil. I got a 250 horse round top 3126 and MD3060 sitting on my frame at home waiting to be finished. Great video as always man!

[OhcoChildPlease]

3126 are really great engines. The only common issues we had in our massive fleet of school buses that had these were the injector cups.

[Vanbulance]

Man! Not 30 seconds into the video and laughed out loud twice!
Rich, thank you for sharing your experience, knowledge and sense of humor with us. Keep up the awesome work.👍

[Badassbowtie]

Millions of HEUI engines out there. Not ideal for people who arent religious with the service intervals. Fleets generally have very little problems with HEUI engines.

[dangravano]

Love the 3126! Round HEUI better then the square. I have one with 400k miles . Keep your engine oil clean. Mine doesn't leak or burn any oil. Good info! Thanks for posting this!

[kennoland]

I helped put a 3126 Cat and Allison trans in a 93 GMC 3500 HD. The truck was featured in Diesel Power a few years ago. Also won Best Custom at Scheid Diesel Extravaganza. It is a full custom show truck that the owner uses to pull his airstream camper all over the country.

[jesseblanchard]

I once saw a mechanic rebuild a DT466 in the frame in less than 12 hours, and he even stopped and took me to lunch. That time is from the time he got to the shop till I drove the truck to its next appointment. LOVE that motor.

[Jack-txve]

What is good about inline 6 s when it comes to plant engines is you can make a modular engine with fewer or more cylinders but using a common architecture. It is more complicated making a V8 and a V6 and a v4. Plus inline engines are simple and 6s are smooth, but those long cranks can be expensive to make well. Great video Rich. That oil pressure driven injector system sounds interesting.

[charlesduncan]

To unlock 5th and 6th or just 6th you need to replace the tcm and replace the valve body it's about $1600 usd

[cheapmoto]

My bus driver who was driving me all throughout elementary school was named Gary😂

[fuzzfire]

Have worked on countless 3126's and c7's at my shop and you hit every point dead on, love the motors because they are so easy to work on and diagnose

[ChristopherPaulBacon-ml]

I like how you give solutions to the engine problems instead of saying "This thing is a POS don't get it." It would be cool to review the 3406 Cat.

[superbigkev]

love the angry school bus driver impression!

[FlyOnAlbatross]

This is the reason I love this channel! You don't shy away from giving your opinions in a well educated, respectful and hilarious manner.

Keep it up, whatever choice of powerplant you go with I for one will be following along regardless of being a Cummins fan!