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Okay, how did the military work on these engines? It looks like you can't put a engine stand on the rear with the flywheel attached. And the flywheel is a bear to remove unless you pull the crank, as the fly wheel has studs that are bolted to the flange 0n the rear of the crank. I don't see how the military changes out flywheels- seems to be easier to replace the whole shooting match.....

I rebuilt any motor about two years ago, and the flywheel does not have pins. It is held on by special shallow-head bolts. As I recall, removed the bolts, then a few light raps on the flywheel, and it came right off. No need to mess with the crankshaft.

I bought a Harbor Freight engine stand, and was careful to use a chain and hoist to hold my motor up when I I bolted the motor to the stand so I did not break off a block "ear" before all the bolts were secure. I had to be a bit creative to secure it safely. I also built a wooden stand to hold my motor for remounting the trans and such.

NV
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EMD567 wrote: I don't see how the military changes out flywheels- seems to be easier to replace the whole shooting match.....

BINGO!

As NV said, the flywheel is held on with nuts and bolts. It's a bit of a pain compared to just bolts and a tapped crankshaft, but shouldn't be an issue.

You mentioned studs. If that's the case snap a photo and post it. I'm curious to know if someone did something a bit "different" to hold the flywheel on.

Here is an old Lakewood engine stand that I converted to 4 wheels. The 3 legs and tiny steel wheels would catch in any cement crack. Dumped an engine block over one time. No more. Made this one longer to accommodate inline 6 cylinder engines. put large wheels on it too. All wheels have a lock.

We had a stand years ago that had an adjustable support on the end opposite where it's bolted to the block.Basicly a pipe inside another with holes for a pin. Made it feel much more secure when torqueing the head bolts.

I use a steel table 28" high that the engine sits on. It is solid, at a comfortable height and safe.

Well, then, I have a story to tell. When the truck was owned by the City of Hampton Roads, they put a clutch in. When they installed the clutch, they put the disc in backwards, so that the shoulder was rubbing on said bolts. I had been driving the truck for about a year, and had no problems.

While at the Georgia rally, I was way back in the woods screwing around, and attempted a hill climb one time too many- I had made it up and down the hill twice, so three shouldn't be a problem, right? Well half way up, the clutch failed-big time. After a 3 mile walk, I came back with my buddy's M931a2, and towed the M37 back to the campground. Tried to adjust the clutch, but no go. Got on the phone to Vintage Powerwagon, and had the whole mess Next Day Aired to me in the woods.

Did a field change out, and discovered what had been done. The bolts(which I thought were studs), are so badly chewed up that they don't look like bolts. I basically buttoned it all back up(with the the clutch disc in correctly) and went on my merry way. 3 years later, and I am freshening up the motor( everything is looking good coming out) I now find out that they are bolts. I will try and upload photos of the flywheel, but I can be computer stupid sometimes.

So where can I find flywheel bolts?

Sorry guys, the photos are too large to post here. If you really want to see them, drop me an email. EMD567@atlanticbb.net

So basically the heads are ground off of the flywheel bolts and there is really nothing holding the flywheel on but the remnants on the bolts without the heads? Damn! You might want to order up a new flywheel while you are at it because I will bet those bolt holes are going to be oblong. Hopefully the holes in the crank aren't wallowed from not having and torque on the flywheel bolts and then the rotation pushing them side to side.

I got lucky. Finally removed the crank from the block, and removed the bolts off the back of the flywheel. Everything came out fine, and the bolts look to be okay- the clutch disc didn't do much damage to the bolts.

Flywheel bolts

Hell, you can use them over again!

You are lucky that the whole thing didn't go up like a grenade!
Gary