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Old 07-12-2003, 06:33 PM
Matt Petty Matt Petty is offline
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Join Date: Jul 2003
Location: San Mateo, CA
Posts: 36
Question Vacuum pump mechanical wheel & drive track questions. ORIGINAL TOPIC!

Hello,
I have looked at all 625 posts found on searching "vacuum pump" and still have some specific questions. This is in regards to my '79 300td.

1. How big is the wheel in the vacuum pump which rides on the "hill and valley" track. My motor appears to to have had a previous vacuum pump lose its bearings in the past (I found them in my oil pump). The "hill and valley" confirms this because of the marks worn into it. My current pump is intact but the wheel is almost the same size as the bearing carriers on either side of the wheel. I am concerned that the worn track from the previous pump failure is now causing premature wear of my current pump's little wheel. My little wheel only protrudes a millimeter or two from its carrier and has a rounded profile. So... how far out of the bearing carriers should the wheel protrude?

2. If indeed the wheel has worn out due to scrubbing on the rough "hill and valley" track, is the track easily replaced or do I have to remove the injection pump and drive?

Thanks in advance!
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1985 300td 150k
1982 300sd (from 150-265k totally unconverted on wvo/diesel blend then stolen and crushed/recovered by a falling tree in a storm)
1980 528i 80k (currently recieving no love)
1985 Toyota 4x4 EFI 120k
1985 524td 90k (totalled on the SF bay bridge; a true crime)
1979 300td 188k
1979 240d 4spd 190k
1989 4runner 4x4
1989 325is
1991 Subaru Legacy
1985 Subaru Wagon
1972 Alfa Romeo GTV2000
1967 VW Bus
1996 XR600
1976 CB750k
1974 CB400f SuperSport
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