 One more oil pump question: gasket or not |
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| bkrantz |
 Jan 21 2023, 08:12 PM
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#1
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914 Guru  Group: Members Posts: 8,646 Joined: 3-August 19 From: SW Colorado Member No.: 23,343 Region Association: Rocky Mountains 
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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: 7,767 Joined: 25-August 18 From: Woods of N. Idaho Member No.: 22,428 Region Association: Galt's Gulch
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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. |
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| 930cabman |
Jan 24 2023, 10:38 AM
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#3
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Advanced Member Group: Members Posts: 4,572 Joined: 12-November 20 From: Buffalo Member No.: 24,877 Region Association: North East States
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QUOTE(Superhawk996 @ Jan 24 2023, 09:25 AM)  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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Posts in this topic
bkrantz One more oil pump question: gasket or not Jan 21 2023, 08:12 PM
Geezer914 Make sure cover is perfectly flat. Use a gasket, ... Jan 22 2023, 06:07 AM 930cabman
I have a Shadek pump adapted for Type 4 (which I ... Jan 22 2023, 07:53 AM Superhawk996 As above - I’m a believer in gaskets for somethi... Jan 22 2023, 11:56 AM bkrantz Thanks. I did lap the cover, which was not flat b... Jan 22 2023, 08:35 PM Geezer914 Gene Berg's book How to hot rod vw engines tel... Jan 23 2023, 03:58 AM bkrantz Let me check my understanding. Optimum gear clear... Jan 23 2023, 08:15 PM
930cabman
Let me check my understanding. Optimum gear clea... Jan 24 2023, 05:54 AM bkrantz I got out my micrometer, and remeasured the gasket... Jan 25 2023, 08:38 PM bkrantz With a moderate amount of pressure, I got a thick... Jan 25 2023, 08:44 PM 930cabman
With a moderate amount of pressure, I got a thic... Jan 26 2023, 06:00 AM ChrisFoley That gasket looks pretty sturdy, more like ones I ... Jan 26 2023, 05:39 AM Superhawk996
That gasket looks pretty sturdy, more like ones I... Jan 26 2023, 07:52 AM rudedude There are plenty of sources for gasket material in... Jan 26 2023, 08:59 AM Superhawk996
There are plenty of sources for gasket material i... Jan 26 2023, 10:51 AM ChrisFoley Now that I'm in the shop I measured what I hav... Jan 26 2023, 11:03 AM Superhawk996
Now that I'm in the shop I measured what I ha... Jan 26 2023, 01:16 PM dr914@autoatlanta.com aftermarket oil pumps for the 914 are hard to seal Jan 26 2023, 11:20 AM 930cabman Lets hope Bob can get er fixed Jan 26 2023, 02:41 PM bkrantz Hey, thanks everyone. I also looked for gasket ma... Jan 26 2023, 08:19 PM |
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