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Old 07-25-2013, 05:07 PM
OM617YOTA OM617YOTA is offline
Mad Scientist
Join Date: Dec 2012
Location: Oregon
Posts: 1,546
Originally Posted by Stretch View Post
Bearings worn?

Copper PTFE piston ring deed?

Did you use a gasket between the pump body and the block / did you RTV it?
Bearings were replaced, both the intermediate shaft bearing and the bearings in the pump. Made no difference.

Copper PTFE piston ring might be toast, though it wasn't knocking before I removed it and I didn't remove it from the vacuum pump when I removed the VP from the engine, just removed the pump and reinstalled. I did R&R it when I replaced the VP bearings. No difference in knocking.

I did use a gasket between the block and pump. Figured the thickness of the gap between block and pump was pretty critical for clearance inside the pump and drive mechanism and wanted to get it right.

I wish most people's guesses were as vague as your "guess" about necessary cfm for an electric vacuum pump to replace our mechanical one.
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