911 turbo head stud trque?
 

Hi, I have an '87 911 turbo that has stock smooth dilivar head studs in it.

The previous owner had the top end done around 40,000 miles ago and he replaced the bottom row dilivar studs according to the receipts I have and there is some oil leaking out between some of the heads and cylinders.

Today I adjusted the valves with the motor in the car and I would like to try retorqueing the head studs because of the oil leakage. It doesn't look easy but I could lower the back of the motor down around 7 inches on to a jack stand and remove the engine tins for better access.

I've heard so many things regarding doing this and I am undecided at the moment. I've also read and heard different torque values between 24 foot pounds and up to 36 ft lbs for the stock smooth finish dilivar head studs.

Is this a good or bad idea?

If I do it should I spray a little WD40 on the barrel nuts, wait a little while and then loosen them just a tiny bit to break the barrel nuts loose and then retorque them or just torque them without loosening them at all first and see if they turn and tighten a little?

I have Wayne's engine rebuilding book with the diagram showing the head nut torque sequence.

And most of all, how much maximum torque should 1987 stock dilivar head studs in a 930 motor running up to 1.1 bar boost on 93 octane be torqued too?

There are no sealing rings between the heads and cylinders on this 3.3 liter motor.

Thanks in advance for any helpful information on this

Jim

Spec calls for 37#ft
I dont trust torquing dilivar after the original torque.
Bruce