 Another Oil Leak Question, Oil leak from cylinder head studs??? |
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| PDXBob |
 Jun 21 2021, 08:44 PM
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#1
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Newbie  Group: Members Posts: 32 Joined: 16-May 20 From: Portland Oregon Member No.: 24,272 Region Association: Pacific Northwest 
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My first question as a relatively new 914 owner. Bought a 1975 1.8L last summer (2020). At that time leaked just about as much oil as the Exxon Valdez. During the winter I dropped engine and fixed all of the usual suspects- rear main seal, oil cooler sealers, pushrod seals, etc.
After finally getting engine back in car I still have an oil leak I can’t find. It is on the right side of engine and it drips down onto pushrod tubes from above. Kind of runs off from the tin piece above pushrod tubes. Looks like it’s coming from near the case, so I’m thinking it may be leaking from a cylinder head stud. First question is: is that possible? Second: What can I do to fix if the stud is leaking from the case? Also, is it likely that the case-piston head seal has developed a leak? BTW, great website. Thanks for your help. PDXBob |
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| bdstone914 |
Jun 21 2021, 09:05 PM
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#2
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bdstone914 Group: Members Posts: 4,522 Joined: 8-November 03 From: Riverside CA Member No.: 1,319 |
QUOTE(PDXBob @ Jun 21 2021, 07:44 PM)  My first question as a relatively new 914 owner. Bought a 1975 1.8L last summer (2020). At that time leaked just about as much oil as the Exxon Valdez. During the winter I dropped engine and fixed all of the usual suspects- rear main seal, oil cooler sealers, pushrod seals, etc. After finally getting engine back in car I still have an oil leak I can’t find. It is on the right side of engine and it drips down onto pushrod tubes from above. Kind of runs off from the tin piece above pushrod tubes. Looks like it’s coming from near the case, so I’m thinking it may be leaking from a cylinder head stud. First question is: is that possible? Second: What can I do to fix if the stud is leaking from the case? Also, is it likely that the case-piston head seal has developed a leak? BTW, great website. Thanks for your help. PDXBob Did you check the oil pressure switch? I doubt a cylinder stud would leak. They are above the oil level. |
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| Shivers |
Jun 21 2021, 09:12 PM
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#3
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Senior Member Group: Members Posts: 2,378 Joined: 19-October 20 From: La Quinta, CA Member No.: 24,781 Region Association: Southern California |
A couple places I have found that ended up there was the pressure sensor up on top of the case on the right side front. Another is the oil filter that seeped and blew back.
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| djway |
Jun 21 2021, 09:24 PM
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#4
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Senior Member Group: Members Posts: 787 Joined: 16-October 15 From: Riverside Member No.: 19,266 Region Association: Southern California |
Where studs go into the case they can leak when open to internals.
Where they go through the heads they can leak. Base of the pistons can leak, piston to head can leak. I am having the same trouble on the 3/4 side. Motor was just out and the only trace of oil I could find was at the ends of the barrels. I retorqued the heads and it has slowed. The case was decked, heads were rebuilt, cut....it still can happen. |
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| PDXBob |
Jun 22 2021, 09:06 PM
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#5
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Newbie Group: Members Posts: 32 Joined: 16-May 20 From: Portland Oregon Member No.: 24,272 Region Association: Pacific Northwest
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Thanks for suggestions. I have an endoscope and I’ll check out oil pressure switch and studs this weekend.
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