Engine Rebuild

[ogrove]

I am planning to do an engine rebuild (bent piston connecting rod). Engine is 6.2L. Has anyone done an engine rebuild, or even just accessed the cylinders, without pulling the body off the frame. I have searched YouTube, but only found videos of complete overhauls and ridiculous modifications.

 

[BLK HMMWV]

I am planning to do an engine rebuild (bent piston connecting rod). Engine is 6.2L. Has anyone done an engine rebuild, or even just accessed the cylinders, without pulling the body off the frame. I have searched YouTube, but only found videos of complete overhauls and ridiculous modifications.

You can take the entire power plant out (engine ,trans, transfer case, in one piece ) without removing the body.
If I had the motor out I'd replace it with a 6.5 NA before I put the 6.2 back in it.

 

[KS_Patriot]

It may not be the same with these motors, but with a lot of American trucks a person is money ahead by replacing the old engine with a new "crate" motor. Unless you can do it all yourself, that is. Good luck with it regardless.

 

[BKubu]

You can take the entire power plant out (engine ,trans, transfer case, in one piece ) without removing the body.
If I had the motor out I'd replace it with a 6.5 NA before I put the 6.2 back in it.

I was going to say the same thing. There are plenty of 6.5's out there. Nothing wrong with a good running 6.2, but I'd take a 6.5 over one. Contact TNJ Murrray in DE. John has some available.

 

[Mogman]

Unless the 6.5L is a GEP it has no real advantage over the 6.2L (unless you get one with the complete serpentine belt setup) having said that there are probably more 6.5L diesels available, if something broke inside your 6.2L then replacement engine would probably be much cheaper than a rebuild.

 

[ogrove]

You can take the entire power plant out (engine ,trans, transfer case, in one piece ) without removing the body.
If I had the motor out I'd replace it with a 6.5 NA before I put the 6.2 back in it.

Thank you for the straight forward answer, and the recommendation. When you upgrade to the 6.5 NA, do you also have to upgrade transmission to 4L80E, or is that only with the 6.5 turbo?

 

[Mogman]

Thank you for the straight forward answer, and the recommendation. When you upgrade to the 6.5 NA, do you also have to upgrade transmission to 4L80E, or is that only with the 6.5 turbo?

You can stick any Detroit in front of the TH400, turbo or not But if you are going to all that trouble you might go all in and do a transmission upgrade at the same time, BTW you do not have to pull the entire package out, you can just pull the engine.

 

[BLK HMMWV]

Thank you for the straight forward answer, and the recommendation. When you upgrade to the 6.5 NA, do you also have to upgrade transmission to 4L80E, or is that only with the 6.5 turbo?

No you don't have to upgrade the transmission to a 4L80E.
I would consider it if I were you however.

Like Mogman said. you don't have to take out everything at once. but you can.
Having a park position in your truck to me is a big plus .
You can add a park pawl to your existing transmission if you would like.

With the 6.5N.A. / 4L80E you will get park as well as overdrive.
If you do choose to also do the 4L80E up grade you will need to source a trans controller and a wiring harness.

Was your engine toast when you got it?
Did you have a chance to drive the truck much before ?

I'm not sure what Tennesse is like and what your plans are for the truck.
When I changed from a 6.2 to 6.5NA it was a night and day difference for me. but I also switch to the 4L80E when I made the change.

 

[mgFray]

Mine is a 6.5L connected to the 3 speed. I was told it was replaced by the Army in 2004. Works fine, but it would be nice to have an overdrive.

 

[Mogman]

Just a side note, if you go with a 4 speed (or 6 speed), you will also need a $500 shifter on top of the 4 speed conversion electronics and shafts if you go with the NP241 so make sure that is in the budget.
I have no idea what is any shaft issues you would have if you stay with the NP218

 

[ogrove]

Thank you everyone. All very helpful answer...and more things to consider.

 

[Action]

A 6.2 or 6.5 from a junkyard will cost a few hundred bucks and a weekend of work.
A 4-speed trans upgrade will cost thousands and lots more time.

 

[JetbikeAnt]

The 6.5 + OD Trans made a huge difference in drivability my opinion. Now I do have more weight as well with my M1045A2 versus my M988.

 

[frank8003]

US Engine Production! Manufacture Ford - Cummins - Marine - 6.5 Turbo Engine

Us Engine Production Inc- 6.2, 6.5 turbo Diesel, Hummer, hummve and Duramax 6600 6.6L GM Chevrolet CK and GMC diesel GM marine

www.65engineparts.com

So I bought a HMMWV 6.2...Now what?

www.dieselplace.com

 

[Mogman]

US Engine Production! Manufacture Ford - Cummins - Marine - 6.5 Turbo Engine

Us Engine Production Inc- 6.2, 6.5 turbo Diesel, Hummer, hummve and Duramax 6600 6.6L GM Chevrolet CK and GMC diesel GM marine

www.65engineparts.com

Since the only engine I see that is a P400 (this is what civilians call the GEP) is 14K I would assume the rest are all import blocks and heads or rebuilt early blocks only. Also the claim "OEM spec" leads me to think possibly all the parts are import