 Type 1 oil pump revisit, For the last time |
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| Chad911sc |
 Feb 24 2026, 10:32 AM
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#1
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Member  Group: Members Posts: 320 Joined: 24-September 24 From: Florida Member No.: 28,374 Region Association: South East States  |
Finally put the short block back together this past weekend! (IMG:style_emoticons/default/beerchug.gif)
This is for the next guy who wants to put an o-ringed oil pump into their motor. I purchased one from low budget VW and it had the correct circumference, but sat too deep into the type 4 case. It bottomed out against the cam, and the o-ring groove was inside the case instead of the case bore ( Pic 1,2). So I dropped the idea of the o-ring pump and just ordered a CB performance pump built for the type 4 engine. I once again measured the circumference against the case and it was good. But, after looking at it closely in the case I noticed that the oil intake once again didn’t line up properly, and it only had a pubic hair’s worth of metal riding on the case. It was sure to suck air, even though it was the correct circumference (Pic 3). So I ended up going to the local water jet shop and took one of the oil pump gaskets with me for the shape. They cut out a spacer from 1/8 inch aluminum and it worked perfectly. Now the intake port lines up correctly and the o-ring sits inside the case bore as it should (Pic 4). Forgot to take a picture of the spacer, but it looks like this one from the German Supply kit.….(Pic5) Attached thumbnail(s)     
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| Jack Standz |
Feb 27 2026, 11:41 AM
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Senior Member Group: Members Posts: 793 Joined: 15-November 19 From: Happy Place (& surrounding area) Member No.: 23,644 Region Association: None 
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Photo shows a Type I oil pump with o-ring modified for a full flow system and use in a Type 1 motor (Gene Berg pump).
Shown here for illustration purposes only about how this Type 1 oil pump and o-ring fits in a Type IV "W" case. You'll note that the o-ring lines up just inside the case bore, which means a spacer (like the one water jetted by @Chad911SC for his project motor) might be needed to put the o-ring a little deeper into the case bore. It also shows how important it is to mock up your motor during the build process. Especially important when modifying things like using a modified Type 1 oil pump in a Type IV motor. There are many options and possibilities when doing so, including modified oil pumps with 1, 2 and even 3 o-rings. YMMV. Attached thumbnail(s) 
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Posts in this topic
Chad911sc Type 1 oil pump revisit Feb 24 2026, 10:32 AM
stownsen914 Thanks for sharing. I had this question about usin... Feb 26 2026, 11:12 AM Chad911sc No the CB performance one is not an o-ringed pump.... Feb 26 2026, 01:28 PM
stownsen914 Thanks. When you say the CB pump has a smaller sea... Feb 26 2026, 03:05 PM Chad911sc If you look at picture #3, you can see what I’m ... Feb 26 2026, 03:37 PM Jack Standz Photo shows a cut-in-half old Type 1 oil pump hous... Feb 27 2026, 11:40 AM Superhawk996 Love the thread title: Type 1 oil pump revisit, F... Feb 27 2026, 12:30 PM friethmiller I'm definitely going to be doing this type of ... Feb 27 2026, 01:58 PM cgnj Unearthing this post. This may be one stop shoppin... May 15 2026, 10:26 AM |
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