Cylinder Head Torque Specifications

Fig. 11 Checking Bolts For Stretching (Necking):

NOTE: Since the Cylinder head bolts are torqued using a new procedure they should be examined BEFORE reuse. If the threads are necked down the bolts should be replaced Fig. 11. Necking can be checked by holding a scale or straight edge against the threads. If all the, threads do not contact the scale the bolt should be replaced.

TIGHTENING PROCEDURE
1. Install the rocker shaft assembly and the cylinder head bolts.

Fig. 12 Cylinder Head Bolt Tightening Sequence:

2. Tighten the cylinder head bolts in the sequence shown Fig. 12.
3. Starting with bolt No. 1, pre-tighten all bolts to 60 Nm (44 ft.lbs.) torque.

Fig. 13 Graduated Disc For Angular Tightening:

4. The following is performed on all bolts, one bolt at a time.
a Starting with bolt No. 1, loosen the bolt completely.
b Tighten bolt No. 1 to 40 N-m (30 ft.lbs.) torque.
c Place the graduated disc tool between the socket and the torque wrench Fig. 13.
d Turn the graduated disc clockwise until the locking stem rests against a solid object which will prevent the disc from turning.
e Angle tighten bolt No. 1 to 180° +/- 20°.
f Repeat the procedure for all bolts in the above sequence.

NOTE: Cylinder Head Bolt (Torque Verification) 70 Nm (52 ft.lbs.)