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Oil leak at high revs

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Old 07-01-2016, 05:21 PM   #1
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Default Oil leak at high revs

Hi there, I'm new to the 914 forum, though I've been a rennlister for other models for a while. I recently picked up a 75 914 that has a 1.7L engine. It's running good after a little work, but it has an odd oil leak. It can sit and idle without leaking any oil, even when hot, but when you rev it out to maybe 4K or higher, it starts spraying oil from the drivers side up near the block. I thought I'd ask here before I tear into it too much. It seems to be related to crankcase pressure. Any ideas to start looking for would be most appreciated. Cheers!
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Old 07-02-2016, 05:49 PM   #2
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Well, in lieu of better ideas, I think we'll go ahead and drop the motor and see if we can find the source of leak. I'll post if I have any revelatory observations.
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Old 07-07-2016, 10:55 AM   #3
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That's a tough one - there are so many places it can leak. As it only leaks at higher rpm when oil pressure rises I'd be looking at fittings in the block such as oil pressure sending unit that are subject to the pressurized oil. Look for an oil system diagram.
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Old 07-07-2016, 12:22 PM   #4
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Quote:
Originally Posted by Last930 View Post
That's a tough one - there are so many places it can leak. As it only leaks at higher rpm when oil pressure rises I'd be looking at fittings in the block such as oil pressure sending unit that are subject to the pressurized oil. Look for an oil system diagram.
Thanks for the input. We dropped the motor and resealed the oil pump. It's tricky to diagnose because the leak comes from the drivers front of the engine, opposite side of the oil cooler. Valve covers, push rod tubes, cam seal, oil cooler all look good, so the oil pump seemed like a possibility. I hate to put it back in car without being sure, but short of running the engine out of the car, I don't think we can duplicate it without installing it again.

I'll double check any fittings on the block and reinstall tomorrow. Hoping for the best!
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Old 07-15-2016, 11:50 AM   #5
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Any progress?
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Old 07-28-2016, 04:44 PM   #6
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two things in that area are the front breather on the head and the thermostat roller bolt
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