LMTV FMTV CAT3116 Engine Front Cover Failure & Cause

This is a common & expensive CAT 3116/3126 engine failure point, which is easily prevented by proper fastening of the air compressor bracket.

Fix/PM: before selling (ie GP) or driving your LMTV / FMTV roll under the truck's oil pan, driver's side, and look at the air compressor bracket-- confirm all the bolts are in & tight.

Pix: CAT 3116 Engine Front Cover Break & Missing/loose/improper-sized Air Compressor Bracket Bolts

Yep had the same issue, compressor brkt was loose/cracked and the front housing was cracked although not as bad as yours pictured. I installed a used front housing and cover and had to repair the compressor support bracket by welding.

I will definitely routinely check the bracket fasteners to make sure they are tight, when I put everything back together I used loctite.

Once the newer trucks get released with the C7 Cat, another failure point will be noted. There is lack of loctite or proper torque on the air compressor driving gear nut. It doesn't harm the cover but the truck will not build air or have power steering when it happens. Either way, it involves removing the front cover and that job is somewhat a pain.