Guide for the latest oil filter housing leak repair?

Talk and Tech about turbocharged 924/944/968 cars
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blade7
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Where is it, Including pics of the water leak?

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Tom
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blade7 wrote: Sat Jul 04, 2026 9:16 am Where is it, Including pics of the water leak?
Do you mean this? viewtopic.php?t=4665&start=10#p52564

Or this? https://www.carpokes.com/viewtopic.php?t=376#p4800

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blade7
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The top one, thanks. :thumbup:

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blade7
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Was the water leaking more when the engine was running?

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blade7 wrote: Sun Jul 05, 2026 1:40 am Was the water leaking more when the engine was running?
I guess. It leaked most wine the coolant was under the most pressure, so the worst was right after shutting off the motor. Once the pressure neutralized, it wouldn't leak.

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blade7
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After rebuilding the engine, the previous owner of my turbo noticed it was regularly losing a small amount of water from the expansion tank. I saw some dampness on the undertray, and guessed it was coming from the oil filter housing, as I don't think he used any sealant on the gasket. Time to get the car on the quickjacks.

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blade7 wrote: Sun Jul 05, 2026 10:48 am After rebuilding the engine, the previous owner of my turbo noticed it was regularly losing a small amount of water from the expansion tank. I saw some dampness on the undertray, and guessed it was coming from the oil filter housing, as I don't think he used any sealant on the gasket. Time to get the car on the quickjacks.
From hard earned experience, I'd say to pressure test the system and find the exact point of the leak. It's sooo easy to be fooled into thinking x is leaking only to discover it's really y. Even with my latest leak, looking straight at the leak, I was fooled at first...

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blade7
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How do you recommend pressure testing the system, I've never had reason to do it. I don't have a compressor.

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blade7 wrote: Sun Jul 05, 2026 1:34 pm How do you recommend pressure testing the system, I've never had reason to do it. I don't have a compressor.
No compressor needed -- you pump it up using a cooling system pressure tester like the one shown below. I pump it to just under cap pressure and make sure it holds that pressure for at least 10 minutes, watching closely for any drips. If you do get drips, it's just a matter of tracking down exactly where they're coming from -- a task that is much easier with pressure on the system to ensure it just keeps dripping until you find it....

pressure-tester.jpg
pressure-tester.jpg (76.43 KiB) Viewed 20 times

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blade7
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Thanks, I'll have a search for one locally :thumbup: .

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