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Join Date: Nov 2001
Location: Central Kentucky
Posts: 729
oil pressure relief springs

I just noticed tonight that my 78SC has equal spring size for both of the oil pressure releif pistons. It also has no sleeve/guide on the one from the bottom of the case. I thought that the cases after 77 had the oil pressure modification and used the different springs as shown in Waynes book.
Should I just replace them with same springs?
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Richard Lane
1978 911SC
1973 "Clean" RS clone
Old 02-16-2006, 06:54 PM
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Doesn't want/need a 3.6L
 
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Re: oil pressure relief springs

Quote:
Originally posted by rlane
I just noticed tonight that my 78SC has equal spring size for both of the oil pressure releif pistons. It also has no sleeve/guide on the one from the bottom of the case. I thought that the cases after 77 had the oil pressure modification and used the different springs as shown in Waynes book.
Should I just replace them with same springs?
Another motor originally built on a Friday afternoon during Oktoberfest! When I tore down my 3.2L motor, I discovered that I was missing the guide for the long spring that mounts vertically in the case. Apparently this is not exactly groundbreaking or cause for alarm as quite a few engines seem to have been missing the guide.

Your 3.0L SC is the same as a 3.2L Carrera & 3.3L 930. The pressure relief pistons used for the horizontal and vertical assemblies are the same pieces, but you should have a shorter spring for the horizontal assembly.

I would replace with what it is supposed to have, as they are dirt cheap. Part numbers are as follows to make it easier:

911 107 512 00 Relief Piston(s)

901 107 531 00 Spring (short)

930 107 531 01 Spring (long)

930 107 533 00 Guide

Good luck!

Ralph
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Old 02-16-2006, 09:46 PM
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Thanks Ralph, BIG help having all the part numbers!
Will call Pelican today.
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Richard Lane
1978 911SC
1973 "Clean" RS clone
Old 02-17-2006, 05:40 AM
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Join Date: Jun 2005
Location: NJ
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Mine was missing the guide and equal springs too. Just replace witht he proper equipment.
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-Brian
Old 02-17-2006, 07:02 AM
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