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Old 10-28-2006, 10:27 AM
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deniss deniss is offline
'84 300SD W126/OM617
 
Join Date: Apr 2006
Location: Central NJ, USA
Posts: 452
Quote:
Originally Posted by Matt L View Post
Here's a wild guess, but check your vacuum pump.
I did listen to it with the stethoscope, and it did sound like it had a bit of knocking going on, but so did the water pump as well... And it made me wonder if I was listening to a local noise or the noise that could have been transmitted from the main engineblock housing...

What sort of sounds would a vacuum pump make when it's starting to go bad? So far, I don't have a problem with vacuum and did not yet notice oil in the vacuum lines... Just out of curiosity, I saw a rebuild kit for the vacuum pump and it was pretty cheap - how easy or hard is it to rebuild?
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84 300SD - bought in April '06 with 237,000 mi
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