M929A1 Belt question

[ecostruction]

Working on the 929 today and noticed a belt was not on. It is old, frail, and brittle. It was just laying next to pulleys. I put it back on where I think it should go. Seems like it should be for the water pump. We've used this truck a lot and never had a problem with it heating up. You can tell its been off a long time. The pulleys are rusty where it appears to go.

Other problem is that we had a fair amount of grease ooze out of both front hubs on the inside. Is there a boot or something to be checked or just a seal?

See pics and as always, thanks for any help.

 

[porkysplace]

Simply typing " M939 axle boot " into the search box at the top right corner of every page bought this thread up as the first thread.
[h=1]M939 Front Axle Boot replacement.....how I did it.....[/h] The belt numbers are in the 5 ton stickies.

 

[juanprado]

The water pump only uses one belt, that is why the other groove is rusty.

The water pump belt replacement is a bear. In a nut shell the water pump housing is round, the pump is eccentric in that housing, think egg shaped. You turn the water pump after loosening the ring around it to adjust the belt on/off. Pump is usually siezed and will leak all the coolant out after the seal is disturbed. Pump will need to be pulled to replace the copper crush gasket. It uses ~~ now hear this, grease to seal it. Craziest thing i have seen in 25 years of automotive aftermarket. Some have been able to rotate the pump without leaking but expect murphy to bite hard

My recommendation is just change the water pump while at it and that will buy you time probably for the life of the truck.

Other tid bit is that the front axle seals are prone to leak besides the boot. The axles leak gear oil, the boot leaks grease. If one leaks into the other they make quite a runny greasy mess.

Unfortunately the water pump and the axle seals are real jobs to tackle.

Boots can be solid or zipper. Many thoughts on that and I leave it to you to research and see what is best for your scenario.