 Unknown fastener, What is that? |
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| trojanhorsepower |
 Jan 4 2026, 08:51 AM
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#1
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Senior Member  Group: Members Posts: 1,019 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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| bdstone914 |
Jan 4 2026, 09:35 AM
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#2
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bdstone914 Group: Members Posts: 5,228 Joined: 8-November 03 From: Riverside CA Member No.: 1,319 |
I have been told a 3/8 extension fits. Or a triple square. Probably a 12 or 14mm.
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| friethmiller |
Jan 4 2026, 09:46 AM
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#3
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Senior Member Group: Members Posts: 1,129 Joined: 10-February 19 From: Austin, TX Member No.: 22,863 Region Association: Southwest Region 
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QUOTE(bdstone914 @ Jan 4 2026, 09:35 AM)  I have been told a 3/8 extension fits. Or a triple square. Probably a 12 or 14mm. Bruce, I've always used a triple square on that bolt. Forget the size. Update: Based on the wear on my triple square set, I bet it's a 14. |
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| trojanhorsepower |
Jan 4 2026, 10:16 AM
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#4
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Senior Member Group: Members Posts: 1,019 Joined: 21-September 03 From: Marion, NC Member No.: 1,179 Region Association: None |
Thanks Guys,
Ill pick one up today. Is it the oil control thingy? Peter |
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| mate914 |
Jan 4 2026, 10:30 AM
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#5
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Matt Group: Members Posts: 923 Joined: 27-February 09 From: Eagles mere, PA Member No.: 10,102 Region Association: North East States
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Yes, looks like the spot. I think some have two and some have one, but I am not sure on that part.
Matt QUOTE(trojanhorsepower @ Jan 4 2026, 11:16 AM) Thanks Guys, Ill pick one up today. Is it the oil control thingy? Peter |
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| trojanhorsepower |
Jan 4 2026, 04:52 PM
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#6
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Senior Member Group: Members Posts: 1,019 Joined: 21-September 03 From: Marion, NC Member No.: 1,179 Region Association: None |
OK got it out and it is the secondary oil control valve. So now the question is is there a block off part for this? Or something like the Tangerine upgrade?
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| barefoot |
Jan 4 2026, 08:54 PM
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#7
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Senior Member Group: Members Posts: 1,454 Joined: 19-March 13 From: Charleston SC Member No.: 15,673 Region Association: South East States
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QUOTE(trojanhorsepower @ Jan 4 2026, 05:52 PM) OK got it out and it is the secondary oil control valve. So now the question is is there a block off part for this? Or something like the Tangerine upgrade? It's a 2ndary oil pressure relief valve, why do you want to block it off ? think it was standard on later years cars |
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| bdstone914 |
Jan 5 2026, 04:11 AM
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#8
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bdstone914 Group: Members Posts: 5,228 Joined: 8-November 03 From: Riverside CA Member No.: 1,319 |
QUOTE(friethmiller @ Jan 4 2026, 09:46 AM) QUOTE(bdstone914 @ Jan 4 2026, 09:35 AM) I have been told a 3/8 extension fits. Or a triple square. Probably a 12 or 14mm. Bruce, I've always used a triple square on that bolt. Forget the size. Update: Based on the wear on my triple square set, I bet it's a 14. Yup Attached thumbnail(s) 
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| 914sgofast2 |
Jan 5 2026, 12:23 PM
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#9
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Senior Member Group: Members Posts: 784 Joined: 10-May 13 From: El Dorado Hills, CA Member No.: 15,855 Region Association: None |
That's the secondary oil pressure relief valve. Only the early 1.7 liter cases had them. That case is an "EC", which means it is a 1.7 liter case.
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| trojanhorsepower |
Jan 5 2026, 05:39 PM
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#10
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Senior Member Group: Members Posts: 1,019 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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| trojanhorsepower |
Jan 5 2026, 05:41 PM
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#11
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Senior Member Group: Members Posts: 1,019 Joined: 21-September 03 From: Marion, NC Member No.: 1,179 Region Association: None |
Here is what the parts look like.
Attached image(s) 
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