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Join Date: Aug 2004
Location: Madison, WI
Posts: 331
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Torque head stud bolts after 500 miles

What torque spec should I be checking my head stud bolts at 500 miles after my rebuild? The studs on my '92 non-turbo 964 were torqued during the build to 11lbs, then +90 degrees. I can't find an answer in any of the Bentley books nor the Porsche Shop Manuals...
Old 04-15-2005, 06:02 AM
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That is a very good question Don. I am still in the midlle of my rebuild and scrubbing parts. I don't know when I will reach a stage to torque the head stud bolts.

When I get there, I will measure what is the peak torque value when you torque the bolt to 92 degrees.

I think the 500 miles check is to really insure than none have fallen off or loosen considerably rather than to reach the established torque value.

---anthony
Old 04-15-2005, 06:33 AM
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There's no reason to re-check the torque of the cylinder head bolts after rebuilding. You can always just put a wrench on them to make sure there are none loose. If any are loose something was done wrong during initial assembly. Porsche does not give any recomendation for checking torque after rebuild. On most, but not all, vehicles cylinder head nut torque or stretch-tightening (which ever applies) is only done during repairs or rebuild, not after the vehicle has been run.
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Old 04-16-2005, 05:43 AM
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