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Maybe this thread gets you motivated enough to modify a set of stock wheels, by flipping the center plates? Safer than spacers? Anytime!

https://www.steelsoldiers.com/threads/tm-9-2320-279-24p1-m977-hemtt-parts-2-of-2.117532/ https://www.steelsoldiers.com/threads/tm-9-2320-279-24p1-m977-hemtt-parts-1-of-2.117531/

OP is right: no exploded views of this, in the 5-ton parts TMs... I did - and don't recall having had any issues, at all. The upper end of the column & all the parts are identical to the Deuces: see TM 9-2320-361-34P, Fig. 115 For the 5-ton column, after removing the horn contact (pic...

All RFs have channels and/or holes and are designed to never block the air valve, no matter what position. I would leave that first wheel as is.

Exactly, that! (Oh, and give your pan a good paint, because now it will rust... ;-) ) Each- and every HMMWV 6.5L engine (of the dozens I have disassembled) had the valve covers and oil pan "glued" in place, and all bone-dry, there...!

Sorry, my pic was generic and only intended to show you the correct bearing number... #12 is just a flat washer (NSN 5340-850-3997), used as spacer for the early production shafts (NSN 5315-143-6399), which were straight pins. Later engines had shouldered shafts, thus eliminating the washer.

Before anything, please take a minute to re-read our Classifieds Rules....

Not the gear, just the bearing.

Maybe time to replace that bearing? It's a double row, angular contact ball bearing (#5204KD).

Those are much better tires but you will need 20x11 (MPT) wheels for them. (like what comes on the M35A3). Your stock wheels are not compatible: different bead style, slightly larger diameter (specs attached), besides being way too narrow.

OK, but it's.........

I'm missing where you say all injector(nozzles) cleaned and working properly... or did you?

Now, someone please explain those other two non-std options....:? Those numbers don't make any sense to me because: 1) In the real world there are only two oversize pistons available for these engines: +0.50mm and +0.75mm. (equivalent to 0.02" and 0.03", respectively). And AFAIK the military...

Absolutely yes, 100%, as sure as day follows night.... :wink: Ah, we are getting closer now... (to explain your shifted axle)

If the valves are found to be OK and the motor turns, check that shear pin (#7)... (I know you said no sounds, but anything is possible...)

That's interesting...! Still, I believe these must be custom made - long years after 1950. And that whoever did it, took the time to weld-shut & grind all the holes. Because in those years all of the wheels were riveted construction, even for the M35. The good thing is that for these, the...

Certainly not stock M135 (or M34) wheels.... See specs below. I can't see any rivet heads on the rim. So if the center is welded to the rim it could well be a modified M34 wheel (?)

In addition to that, blocking the air intake also helps.

Just to clarify: that locating pin actually goes into a second, separate hole, off-center & towards the rear of vehicle. You- and prob. Mullaney may have missed what the OP said in post #4: So the pin in question is there, and even if that "nub" and/or seat was worn out, it would not explain...