Quote:
Originally Posted by FratBoy
I rebuilt my vacuum pump just 300 miles ago with sealed bearings.
I started to hear a noise so I popped it off. The bearings are gone and the pump is toast. Bearing races are still in the piston arm and on the roller axle
I haven’t dropped the oil pan yet to look for additional damage. Engine was still running when I parked it…
I’m trying to figure out how this happened. The pump was clean and dry inside. Is it supposed to be lubricated with oil pressure?
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For anyone reading it need year and model of the vehicle.
You are not saying why you rebuilt the vacuum pump to begin with. There is a bushing behind the timer gear if that wear is stressing the vacuum pump and ruins even a new vacuum pump.
You check that by using a dial indicator and pushing the timer gear to the read and pulling it forward and looking at the end play.
"with sealed bearings"; The bearings need to be open for engine oil to lube them. Another issue is that if the bearing cage inside of the bearings is plastic the plastic falls apart. So, you need open bearings with steel bearing cages.