Fastener Tightening Specifications

TIGHTENING SPECIFICATIONS
1. Cylinder head bolts should be carefully examined before reuse. If the threads are necked down, the bolts should be replaced.

NOTE: 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.

2. Before installing the bolts, the threads should be oiled with clean engine oil.





3. Tighten the cylinder head bolts in the sequence shown in the illustration. Using the 4 step torque turn method, tighten according to the following values.
a. Tighten center fasteners 1 thru 6 to 33 Nm (25 ft. lbs.). Then outer fasteners 7 thru 10 to 27 Nm (20 ft. lbs.).
b. Tighten center fasteners 1 thru 6 to 67 Nm (50 ft. lbs.). Then outer fasteners 7 thru 10 to 27 Nm (20 ft. lbs.).
c. Tighten center fasteners 1 thru 6 to 67 Nm (50 ft. lbs.). Then outer fasteners 7 thru 10 to 27 Nm (20 ft. lbs.).





d. Turn all fasteners 1 thru 10 90° clockwise. Do not use a torque wrench for this step.

CAUTION:
- Always make a tightening angle just 90°. If it is less than 90°, the head bolt will be loosened.
- If it is more than 90°, remove the head bolt and repeat the procedure.





DIMENSIONS
Flatness Limit [1] 0.1 mm (0.004 inch)

[1] Use a straightedge and feeler gauge.


Semi-Circular Plug Sealant 3M ATD Part No. 8660, Or Equivalent