Military 6.2 Cam

[jel1990]

A friend of mine has had several ex-military 6.2 engines, and he told me that he compared a cam from a standard civilian 6.2 to a cam from a military 6.2, and the military cam measured .010" bigger than the standard 6.2 cam. Has anyone here heard of this?

[millwrightjesse]

That's a first for me

[JohnC]

the military cam measured .010" bigger than the standard 6.2 cam.
bigger where? If it's the journals, could it be a repair (oversized) part?

[Robyn]

According to everything I have ever seen and any of the info I have available, the cams are all the same for the 6.2 and 6.5 engines.

I have never seen any ODD ducks anywhere inside a 6.2

The differences on a 6.2 MIL as compared to the Civy version is the intake manifolds, exhaust manifolds (HMMWV), the IP and some of the other accessories/drives and such.

Internally these engines are identical.

There is one set of cam bearings offered for the 6.2/6.5 and thats it.

I want to see this ODD duckling, as mentioned, maybe a repair, but that makes no senses to make a journal larger. A welded up journal would be remachined back to specs.

The cam journals are largest at the front one and progressively get smaller as you go towards the rear of the shaft.

More info please.

Missy

[Kennedy]

Oh yeah the military were special and increased HP by 100% as evidenced by the lack of smoke.

OK I'm being sarcastic. Lots of BS claims like marine this and military that. Most of this leads to claims of being better, yet nothing to back it up just claims by a fly by night...

[JohnC]

Now that I think about it, since there are cam bearing inserts, an oversized cam makes no sense. (Aircraft experience coloring my judgment...)

'Course, we still don't know what it was that was .010 larger...

[NH2112]

AFAIK the only internal difference on a military 6.2l or 6.5l engine is that the injector pump has hardened internals because of the low-lubricity JP8 used as fuel.

[jel1990]

My friend claimed that the lobes were .010" bigger. He is the only person that i have ever heard that from though and I was a bit skeptical, so I thought I would ask everyone here. As far as I knew there were no internal differences between the mil. & civ. versions, just a few different bolt-on components as Robyn stated.

Thanks for all the replies,
Justin

[Robyn]

The cam has been the same in the 6.2/6.5 since 1982
Even the turbo versions use the same cam.


Missy