Porsche 924 Turbo Model

924 Turbo Model

This technical information replaces all previous instructions concerning the tightening of cylinder heads on 924 Turbo vehicles produced from 1980 to 1982. The following parts are valid for repairs.

Cylinder Head Gasket.Part Number 931 104 337 03
Cylinder Head Bolt.....Part Number N 014 731 2
Washer.......................Part Number 059 103 377 A

Tightening is done in 5 steps but not to the torque angle method:

Step 1:  Tighten head bolts to 29 ft/lbs. following sequence.
Step 2:  Tighten head bolts to 59 ft/lbs. following sequence.
Step 3:  Tighten head bolts to 81 ft/lbs. following sequence.
Step 4:  After at least 60 minutes, retighten cylinder head bolts by first loosening
No. 1 bolt (see sequence) by 1/2 turn and then retightening to 81 ft./ lbs.
Apply procedure to remaining bolts in sequence.

Run engine to operating temperature.
Step 5: Let engine cool down and tighten cylinder head bolts as in Step 4.

Note: Cylinder head bolts do not have to be retorqued. Threads and bearing surfaces of bolts must be lightly lubricated with oil prior to installation. Washers must not turn while tightening. Create a reference mark if necessary. Cylinder head bolts of this type can be reused.

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