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Registered
Join Date: Mar 2002
Location: Oregon
Posts: 39
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Bottom Valve Covers leak through nuts....
Has anyone ever had their bottom valve covers leak through the nuts? I can see that oil is dripping from the threaded studs that the nuts screw onto to. The oil actually drips right off the nuts on to the heat exchangers. It is way more visible when the car is running....
Any thoughts on fixing this? Is this more than your average valve cover problem? By the way, I already have Turbo covers. thanks, John H |
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03-11-2002, 06:06 PM
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Registered
Join Date: Oct 2001
Location: Anderson, SC, USA
Posts: 128
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John,
Did you replace the nylock nuts when you did your last valve job? These usualy come in the gasket kit. HTH
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Ben in SC Looking for next project!!! South East SCWDP Region, President |
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03-11-2002, 06:14 PM
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Join Date: Mar 2002
Location: Oregon
Posts: 39
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yeap.....
Ben,
Nuts were replaced with nylock ones in the kit. The covers dont appear to be leaking from anywhere else. John |
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03-11-2002, 06:17 PM
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Join Date: Oct 2001
Location: Anderson, SC, USA
Posts: 128
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I figured I was stating the obvious, but thought I would start simple. I guess it is possible that the nuts are over torqued? This is the only other explanation I can come up with......
I am sure someone else will chime in any second......... Stay tuned.
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Ben in SC Looking for next project!!! South East SCWDP Region, President |
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03-11-2002, 06:24 PM
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John,
Same thing happens on my bottom valve cover nuts too, the oil collects there in a ball and then eventually drops on the floor. I bought a new gasket set with nuts/washer....I'll let you know if that works for me. good luck!
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www.swirlednews.com/article.asp?artID=501 The data in the CD-type disc decodes easily into ASCII computer text as follows, using 8 bit binary: * "Beware the bearers of FALSE gifts & their BROKEN PROMISES. Much PAIN but still time. (Damaged Word). There is GOOD out there. We OPpose DECEPTION. Conduit CLOSING (BELL SOUND)” * The damaged word would appear to be intended as “BELIEVE”. |
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03-11-2002, 06:54 PM
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Registered
Join Date: Dec 1999
Location: TX USA
Posts: 9,804
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1. Were the gaskets the type with the green silicone bead meandering around to match the ribs on the valve cover?
2. Did you use the proper lower torque specified in the '78 - '81 SC spec books on the nuts? If you used the 'normal' 18 lb-ft rating for M8 fasteners, then the lower gaskets are probably damaged, distorted, and the caus of your leak! Too high an applied torque can squish out the green silicone bead from the narrow ribs on the valve covers! If the silicone bead 'O-ring' around the lowest stud holes was damaged at installation ... the oil has a direct path to the Nylock nut, resulting in the leaks you describe! Please NOTE: The torque specified in the spec books is 8 N-m, which comes to 5.8 lb-ft ... less than the torque for the oil sump cover M6 (10 mm nuts) fasteners!!! A 'normal' 13 mm combination wrench -- gripped with one hand right next to the box-end can be used to assure that the torque won't be excessive ... but the preferred method of tightening those lower valve cover nuts would be a 1/4" drive torque wrench. No 3/8" or 1/2" drive torque wrench can make an accurate measurement of 5.8 lb-ft! That would be 70 in-lbs!
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Warren Hall, Jr. 1973 911S Targa ... 'Annie' 1968 340S Barracuda ... 'Rolling Thunder' |
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03-11-2002, 07:27 PM
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Join Date: May 2001
Location: Peoples Republic of Long Beach, NY
Posts: 21,140
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I routinely use some silicone sealer under washer to fix/prevent that drop that weeps from the threads
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Ronin LB '77 911s 2.7 PMO E 8.5 SSI Monty MSD JPI w x6 |
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03-11-2002, 07:52 PM
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1970, 1983 Porsche 911T, SC 2.2L, 3.0L 
