Cylinder Head Bolt Torque

CYLINDER HEAD BOLT TORQUE/SEQUENCE





Using the sequence shown, tighten bolts in the following steps:
a. Torque bolts to 80 Nm (59 ft. lbs.)
b. Torque bolts to 105 Nm (77 ft. lbs.)
c. Re-check all bolts to 105 Nm (77 ft. lbs.)
d. Tighten all bolts an additional 1/4 turn (90 °).

CYLINDER HEAD SURFACE VARIATION





Check the head distortion (Fig. 25). The distortion of the combustion deck face is not to exceed 0.010 mm (0.0004 inch) in any 50.8 mm (2.00 inch) diameter. Overall variation end to end or side to side 0.30 mm (0.012 inch).
DO NOT proceed with the in-chassis overhaul if the cylinder head or block surface is damaged or not flat (within specifications).
Visually inspect the cylinder head bolts for damaged threads, corroded/pitted surfaces, or a reduced diameter due to bolt stretching.

CYLINDER HEAD BOLT RE-USABILITY





If the bolts are not damaged, their "free length" should be measured using the cap screw stretch gauge provided with the replacement head gasket. Place the head of the bolt against the base of the slot and align the bolt with the straight edge of gauge (Fig. 26). If the end of the bolt touches the foot of the gauge, the bolt must be discarded, The maximum bolt free length is 132.1 mm (5.200 inch).