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Registered
Join Date: Mar 2022
Posts: 28
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Oil Pressure Relief Valve Spring Length
In the 964 Technical Data Without Guesswork book the Oil Pressure Relief Valve Springs are spec'd at 70mm and 89mm length. I measured the lengths at 66mm and 85mm, respectively.
First, is the shortened length an issue? If yes, is there a method to lengthen them or should they be purchased new? |
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08-12-2023, 04:03 PM
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It's a 914 ...
Join Date: Jan 2008
Location: Ossining, NY
Posts: 4,742
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4 mm isn't terrible, but personally I'd buy new since they are out of spec. Not expensive, I believe.
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08-13-2023, 05:57 PM
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PCA Member since 1988
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I had low oil pressure in my engine at first, topping out in the 50 psi range at 6000 RPM. I didn't measure the pressure relief spring before I put it back in--after all, it's just an oil pressure spring, what can go wrong? So then I pulled it out and measured it: 87.9mm. That's not far off the spec, not enough to account for the slightly low oil pressure. So I shimmed it up using a spare m6 nut in the bottom of the cap. That brought it up to 60psi. I suppose my oil pressure gauge or sender are out of spec, but I haven't got around to measuring those yet. Yes, it's on my do list. Too many other things to do.
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1973.5 911T with RoW 1980 SC CIS stroked to 3.2, 10:1 Mahle Sport p/c's, TBC exhaust ports, M1 cams, SSI's. RSR bushings & adj spring plates, Koni Sports, 21/26mm T-bars, stock swaybars, 16x7 Fuchs w Michelin Pilot Sport A/S 3+, 205/55-16 at all 4 corners. Cars are for driving. If you want art, get something you can hang on the wall! |
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08-15-2023, 10:39 AM
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