Cylinder Head Assembly
DIMENSIONSCombustion Chamber Volume: 59.7-67.7 cubic cm
Valve Guide Bore Diameter: 8.745-8.720 mm (0.3443-0.3433 inches)
Valve Seats
Width (Intake And Exhaust): 1.5-2.0 mm (0.06-0.08 in)
Angle: 44.75°
Runout (T.I.R.): 0.076 mm (0.003 in)
Bore Diameter (Insert Counterbore Diameter)
Intake (Max): 47.097 mm (1.8542 inches)
Intake (Min): 47.072 mm (1.8532 inches)
Exhaust (Max): 39.739 mm (1.5645 inches)
Exhaust (Min): 39.714 mm (1.5635 inches)
Gasket Surface Flatness: 0.018 mm (0.007 inch)
Valve Stem To Guide Clearance
Intake: 0.026-0.071 mm (0.001-0.0028 inch)
Exhaust: 0.038-0.083 mm (0.0015-0.0033 inch)
TORQUE SPECIFICATIONS
CAUTION: Always use new cylinder head bolts to make sure a leak-tight assembly. Torque retention with used bolts can vary, which may result in coolant or compression leakage at the cylinder head mating surface area.
1. Tighten cylinder head retaining bolts in sequence as follows:
a. 20 Nm (15 ft. lbs.)
b. 40 Nm (29 ft. lbs.)
c. 50 Nm (37 ft. lbs.)
NOTE: When cylinder head retaining bolts have been tightened using the recommended procedure, it is not necessary to retighten bolts after extended engine operation. However, bolts can be checked for tightness if desired.
2. In sequence, loosen retaining bolts two to three revolutions and retighten bolts-one at a time in the following manner:
a. Long bolts:
- 40-50 Nm (29-37 ft. lbs.).
- Tighten bolt an additional 175-185 degrees.
- Go to the next bolt in sequence.
b. Short bolts:
- 20-30 Nm (15-22 ft. lbs.).
- Tighten bolt an additional 175-185 degrees.
- Go to next bolt in sequence.
CAUTION: Do not loosen all of the bolts at the same time. Only work on-one bolt at a time or damage to engine or leakage may occur.