911 Carrera Model

This technical information replaces all previous instructions in repair publications concerning the tightening of cylinder heads on the 911 Carrera.

Torque angle tightening method is used for all 911 Carrera cylinder heads from Model Year 1984 in conjunction with new cylinder head nuts, Part Number 901 104 382 02 (yellow color).



Nuts must be replaced in each repair (not reusable) .

Work Sequence:

Step 1: Torque all nuts to 15 N-m (11 ft. lbs.) in proper order.
Step 2: Torque all nuts an additional 90 degrees in proper order (see sketch).

The bearing surface of the cylinder head nuts and the threads must be coated lightly with Optimoly HT. Never use lubricants between washer and bearing surface on the cylinder head.

Washers must not turn while tightening. Create a reference mark if necessary.

Previous tightening method is still valid for 911 cylinder heads up to 1983 Model Year and all 911 Turbos even when using the new type nuts.

Step 1: Torque to 10 N-m (7 ft. lbs.) in correct order.
Step 2: Final torque to 32 N-m (23 ft. lbs.) in correct order (see sketch).