 Unknown fastener, What is that? |
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| trojanhorsepower |
 Jan 4 2026, 08:51 AM
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Senior Member  Group: Members Posts: 1,020 Joined: 21-September 03 From: Marion, NC Member No.: 1,179 Region Association: None  |
My guess is the secondary oil pressure control. Is that correct? What fastener type/size is that?
 Its on this case  |
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| trojanhorsepower |
Jan 5 2026, 05:39 PM
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#2
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Senior Member Group: Members Posts: 1,020 Joined: 21-September 03 From: Marion, NC Member No.: 1,179 Region Association: None |
OK, so the reason to block it off is to get higher oil pressure when the motor is hot, I believe this is a common upgrade by performance engine builders.
I am going to leave it stock for now. It is a 1.7, your are correct there, but I think all original type 4 914 engines have this part. My reading indicates that the second oil pressure control valve was standard on type 4 engines until VW started to experiment with hydraulic lifters. At that point they stopped milling out the passage or taping the threads. Either way it is definitely present on my 1974 2.0l GA case. |
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Posts in this topic
trojanhorsepower Unknown fastener Jan 4 2026, 08:51 AM
bdstone914 I have been told a 3/8 extension fits. Or a triple... Jan 4 2026, 09:35 AM
friethmiller
I have been told a 3/8 extension fits. Or a tripl... Jan 4 2026, 09:46 AM bdstone914
I have been told a 3/8 extension fits. Or a trip... Jan 5 2026, 04:11 AM trojanhorsepower Thanks Guys,
Ill pick one up today. Is it the oil... Jan 4 2026, 10:16 AM mate914 Yes, looks like the spot. I think some have two an... Jan 4 2026, 10:30 AM trojanhorsepower OK got it out and it is the secondary oil control ... Jan 4 2026, 04:52 PM barefoot
OK got it out and it is the secondary oil control... Jan 4 2026, 08:54 PM 914sgofast2 That's the secondary oil pressure relief valve... Jan 5 2026, 12:23 PM trojanhorsepower Here is what the parts look like. Jan 5 2026, 05:41 PM |
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