Swapping engine from different vehicles

[NormB]

Specifically, installing a 6.2L NA from a 1985 M1009 into a 1992 M1038 HMMWV.

Anything I need to know about whether this engine will match the fittings/transmission (TH400/3L80) in mine? Bolt-ups/frame mount locations, oil hoses, etc?

I admit I don't know much about these things, but it would SEEM to me the basic block shouldn't have changed much which is exactly why I think it COULD.

Looking into picking up a "spare" as insurance.

Thanks in advance.

Norm

 

[Bulldogger]

A quick Google check says that they should both be 6.2l's, so shouldn't be too hard. I have seen multiple references that say stepping up from the 6.2L to the 6.5L involves having to get a new wiring harness (several hundred $, apparently).

Doesn't mean I'm not thinking about it myself, since the recyclers have been letting 6.5's w/ trans go cheap these days out in places like Wilmington.

Bulldogger

 

[NormB]

Reason I ask, like I said, is it SEEMS like it would work.

I've also read several posts about swapping engines - I know about the wiring harness bit.

I'll stay with the 6.2L for that and other reasons, mostly because the price is right for the one I'm looking at and I can take some time with it to check/replace seals/water jacket plugs/gaskets before I DO use it (if I ever need to).

 

[NormB]

Interesting, while looking for something else I found this:

http://www.steelsoldiers.com/showth...vs-CUCV-M108-6-2L&highlight=harmonic+balancer

From a decade ago.

Looks doable.

New GPs, maybe use same IP for a while (or sell as rebuilt), change oil pan/gaskets. If flywheel matches, just plug and play - mostly.

Anyone care to chime in who's actually done this?

 

[infidel got me]

I changed a 6.5 to a 6.2 l. The customer purchased the motor before he knew what he had. Went right in with no problem. Basically the same as far as I know.

 

[Wire Fox]

In terms of bolt patterns and it having the right form, fit, and function, they should be cross compatible. Great evidence for this is the fact that when replacing a no-longer-produced 6.2L engine, the Army orders a new 6.5L GEP engine, but has it shipped with a de-tuned injection pump that's meant to match the power output of the original 6.2L engine. Some things will be different on the individual components that are on each engine, but the major assemblies are interchangeable and you can certainly swap a whole engine and be able to bolt on everything driven by the drive belts, the transmission, and all of the wiring. The 6.5L wiring harness should only come into play when you actually have a "true" 6.5L setup, meaning you have various extra sensors installed on the engine to support a 4L80E transmission and you have the matching A2 body harness that it can couple with.