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Join Date: Apr 2003
Location: Carnation, WA
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Head Studs re-torque?
I seem to remember reading somewhere that the head studs should be re-torqued after the first few thousand miles, I did this once already.
The engine is now at 16,000mi after a full rebuild, I have the engine out for a new clutch, and a valve adjustment. Should I re-torque the head studs again? if so do you loosen first then torque or just torque. (the engine has no issues, no signs of leakage or seepage at the cylinders or heads)
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David |
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09-14-2009, 07:38 PM
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Do not loosen them, just set your torque wrench and check. They will turn a little after a rebuild, but should hold torque after a few times.
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09-14-2009, 07:52 PM
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Join Date: Apr 2006
Location: Charleston, SC
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Good question. I retorqued at 1k. I am at 8k now and was wondering the same thing b/c I will be adjusting the valves at 10k.
What about the cam tower nuts? Do those need to be checked as well? You are lucky to have the opportunity to recheck everything with the engine out. Checking head studs with the engine in the car is no easy task ... at least it wasn't for me.
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09-15-2009, 06:18 AM
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it is an easy check to do when doing the valves.
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09-15-2009, 07:28 AM
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Also, at the same time, make sure your rocker shafts are not moving sideways off location.
Bruce |
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09-15-2009, 10:56 AM
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This has always bothered me. Waynes book states 23.5 ft-lbs, retorque after 500 miles. The Clymer book states 23 ft-lbs. No mention of retightening. Haynes book states 21 ft-lbs, no mention of retightening. Andersons Porsche 911 Performance Handbook states 25 ft-lbs for steel studs and 29 ft-lbs for Dilavar, no mention of retightening. The factory manual states 11 ft-lbs, then 90* turn, no mention of retightening. The local dealership tech believes Porsche manual should be followed, no retightening of nuts. I believe Porsche used some intelligent engineers over the years and might be the best route to take. Perhaps it is different for built engines pushed hard with higher horsepower, but can anyone give me a reason on a standard rebuild to use a different method than the factory manual?
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09-15-2009, 04:03 PM
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It seems to depend on the engine and it's use as to if you need to retorque. My rece engine with steel studs needed to be retorqued after a few hours because the nuts loosened. They have held since the retorque. I'm certain that most engines don't need to be retorqued but it doesn't hurt anything to check.
-Andy
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09-15-2009, 04:48 PM
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The Other Woman
