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79 911 sc
Join Date: Oct 2007
Location: NH
Posts: 138
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Loose Head Bolts????
Looking for some input on why my head bolts wont stay tight. 79 sc, fresh rebuild upper and lower, ge60 cams, je piston with 9.5 cr, weber 40s. Studs are new dilivar by previous owner. This is the 2nd time they have come loose. Any thoughts would be appreciated. Thanks Bill
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10-09-2010, 06:32 AM
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Threads stripped or pulled in the case?
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Pete 79 911SC RoW "Tornadoes come out of frikkin nowhere. One minute everything is all sunshine and puppies the next thing you know you've got flying cows".- Stomachmonkey |
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10-09-2010, 07:11 AM
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Registered
Join Date: Jul 2001
Location: Portland Oregon
Posts: 7,007
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Bill,
Just to be clear, are you referring to loose head nuts or the studs??? Are you sure they used Dilavars in the rebuild?
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Steve Weiner Rennsport Systems Portland Oregon (503) 244-0990 porsche@rennsportsystems.com www.rennsportsystems.com |
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10-09-2010, 08:11 AM
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Registered
Join Date: Aug 2009
Location: Ottawa, Ontario
Posts: 289
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The solander should have been replaced with steel. Hopefully the threads in the case haven't been stripped. Are you setting them to the roper torque
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10-09-2010, 08:47 AM
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Join Date: Aug 2009
Location: Ottawa, Ontario
Posts: 289
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Stupid auto correct. Solander Should say dilavar
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10-09-2010, 08:49 AM
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Registered
Join Date: Jan 2006
Location: Santa Barbara, CA
Posts: 2,307
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Mine loosened three times I think before finally staying tight. Check them frequently over the next year, they may fix themselves.
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jhtaylor santa barbara 74 911 coupe. 2.7 motor by Schneider Auto Santa Barbara. Case blueprinted, shuffle-pinned, boat-tailed by Competition Engineering. Elgin mod-S cams. J&E 9.5's. PMO's. 73 Targa (gone but not forgotten) |
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10-09-2010, 11:58 AM
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Registered
Join Date: Jul 2001
Location: Portland Oregon
Posts: 7,007
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Quote:
ARP's and Raceware's do loosen over time as they do not expand at the same rate as the rest of the engine.
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Steve Weiner Rennsport Systems Portland Oregon (503) 244-0990 porsche@rennsportsystems.com www.rennsportsystems.com |
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10-09-2010, 01:00 PM
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79 911 sc
Join Date: Oct 2007
Location: NH
Posts: 138
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They are dilavars and they seemed to be anchored correctly. I am attending a DE mon and tues I will check them after that and see if they are still at 24ft lbs. Thanks fot the input! Much appreciated.
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10-10-2010, 05:26 AM
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1979 Porsche 911SC
