Cylinder Head Assembly: Specifications

NOTE: The Cylinder head bolts should be examined BEFORE reuse. If the threads are necked down, the bolts must be replaced (Fig. 15).





Cylinder Head-Bolts
On Non-PZEV equipped engines tighten the cylinder head bolts in the sequence shown in (Fig. 16). Using the 4 step torque turn method, tighten according to the following values:
^ First: All to 34 Nm (25 ft. lbs.)
^ Second: All to 82 Nm (60 ft. lbs.)
^ Third: All to 82 Nm (60 ft. lbs.)

CAUTION: Do not use a torque wrench for the Fourth step.

^ Fourth: Turn all bolts an additional 1/4 Turn

On PZEV equipped engines tighten the cylinder head bolts in the sequence shown in (Fig. 16). Using the 4 step torque turn method, tighten according to the following values:
^ First: All to 34 Nm (25 ft. lbs.)
^ Second: All to 82 Nm (60 ft. lbs.)
^ Third: All to 82 Nm (60 ft. lbs.)

CAUTION: Do not use a torque wrench for the Fourth step.

^ Fourth: Turn all bolts an additional 1/4 Turn

Cylinder Head Cover-Bolts 12 Nm (105 inch lbs.)





Camshaft Bearing Caps
Install right and left No. 2 - 5 and right No. 6. in sequence shown in (Fig. 25).
Tighten M6 fasteners to 12 Nm (105 inch lbs.)

Camshaft Sprocket-Bolt 115 Nm (85 ft. lbs.)
Check Valve to Exhaust Manifold 12 Nm (105 inch lbs.)





Exhaust Manifold to Cylinder Head-Bolts
Tighten fasteners in sequence shown in (Fig. 108)
Non-PZEV engines to 23 Nm (200 inch lbs.).
Repeat this procedure until all fasteners are at specified torque.





Exhaust Manifold to Cylinder Head-Bolts
Tighten fasteners in sequence shown in (Fig. 109)
PZEV engines tighten bolts to 23 Nm (200 inch lbs.).
Repeat this procedure until all fasteners are at specified torque.

Exhaust Manifold Heat Shield-Bolts 12 Nm (105 inch lbs.)





Intake Manifold-Bolts
Gradually tighten fasteners to 28 Nm (250 inch lbs.) in sequence shown in (Fig. 104).

CYLINDER HEAD CAMSHAFT BEARING BORE DIAMETER
Journals No.1 -6 26.020 - 26.041 mm (1.024 - 1.025 in.)

CAMSHAFT
Journal Diameter No. 1-6 25.976 - 25.995 mm (1.022 - 1.023 in.)
Bearing Clearance -Diametrical 0.025 - 0.065 mm (0.0009 - 0.0025 in.)
End Play 0.05 - 0.17 mm (0.0019 - 0.0066 in.)
Lift (Zero Lash)
Intake 8.25 mm (0.324 in.)
Exhaust 6.60 mm (0.259 mm)
Intake Valve Timing*
Closes (ABDC) 44.3°
Opens (ATDC) 6.2°
Duration 218°
Exhaust Valve Timing*
Closes (ATDC) 0.8°
Opens (BBDC) 39.9°
Duration 220.7°
Valve Overlap 5.4°

* All reading in crankshaft degrees at 0.5 mm (0.019 in.) valve lift.

CYLINDER HEAD
Gasket Thickness (Compressed) 0.71 mm (0.028 in.)

VALVE GUIDE
Diameter I.D. 5.975 - 6.000 mm (0.235 - 0.236 in.)
Guide Bore Diameter 11.0 - 11.02 mm (0.4330 - 0.4338 in.)
Guide Height (spring seat to guide tip) 13.25 - 13.75 mm (0.521 - 0.541 in.)