One more oil pump question: gasket or not |
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One more oil pump question: gasket or not |
bkrantz |
Jan 21 2023, 08:12 PM
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#1
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914 Guru Group: Members Posts: 8,066 Joined: 3-August 19 From: SW Colorado Member No.: 23,343 Region Association: Rocky Mountains |
I have a Shadek pump adapted for Type 4 (which I know some people don't like). The first time I installed the pump cover I did not use a gasket, just case-sealant. For the second time around, should I use a gasket under the cover?
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Superhawk996 |
Jan 24 2023, 08:25 AM
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#2
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914 Guru Group: Members Posts: 6,469 Joined: 25-August 18 From: Woods of N. Idaho Member No.: 22,428 Region Association: Galt's Gulch |
In my opinion, that is right on the cusp.
Desired end play is < 0.004” per tribal knowledge - Samba, Berg, VW Bentley manual, etc. In the case of the Bentley manual, that end play 0.004” tolerance is without the gasket. Of course, that was back when OEM gaskets would have been readily available. I’m not sure what OEM gasket thickness was on the Bug but I’m certain they were very, very, thin based on the Bug motors I’ve town down over the years. The gasket will compress slightly - 0.0005” ? (IMG:style_emoticons/default/confused24.gif) so I don’t think you’re far off with your gasket. Sure would be nice to come up with a gasket more like 0.003”. Better to see if you can come up with a thinner gasket. This is the sort of stuff that makes engine building a PITA but it is also where patience and parts sorting pays off. |
930cabman |
Jan 24 2023, 10:38 AM
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#3
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Advanced Member Group: Members Posts: 3,549 Joined: 12-November 20 From: Buffalo Member No.: 24,877 Region Association: North East States |
In my opinion, that is right on the cusp. Desired end play is < 0.004” per tribal knowledge - Samba, Berg, VW Bentley manual, etc. In the case of the Bentley manual, that end play 0.004” tolerance is without the gasket. Of course, that was back when OEM gaskets would have been readily available. I’m not sure what OEM gasket thickness was on the Bug but I’m certain they were very, very, thin based on the Bug motors I’ve town down over the years. The gasket will compress slightly - 0.0005” ? (IMG:style_emoticons/default/confused24.gif) so I don’t think you’re far off with your gasket. Sure would be nice to come up with a gasket more like 0.003”. Better to see if you can come up with a thinner gasket. This is the sort of stuff that makes engine building a PITA but it is also where patience and parts sorting pays off. It's either right or not right. https://aapistons.com/collections/oil-pumps...mp-cover-gasket Not sure of the thickness, but is sold as a "cover gasket" |
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