Cylinder Head Assembly: Specifications

CYLINDER HEAD






CYLINDER HEAD TORQUE AND SEQUENCE





1. The cylinder head bolts are torqued using the torque-angle method, they should be examined BEFORE reuse. If the threads are necked down, the bolts must be replaced.
2. 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.




3. Tighten the cylinder head bolts 1 - 8 in the sequence shown. Following the 4 step tightening method:
- Step 1: Bolts 1 - 8 to 61 Nm (45 ft. lbs.).
- Step 2: Bolts 1 - 8 to 88 Nm (65 ft. lbs.).
- Step 3: Bolts 1 - 8 (again) to 88 Nm (65 ft. lbs.).
- Step 4: Bolts 1 - 8 turn an additional 120°. (Do not use a torque wrench for this step.)

NOTE: Bolt torque after 120° turn should be over 122 Nm (90 ft. lbs.). If not, replace the bolt.

INTAKE MANIFOLD TORQUE AND SEQUENCE





1. Carefully install the new intake manifold gasket. Tighten end seal retainer screws to 12 Nm (105 in.lbs.).
2. Install lower intake manifold. Install the bolts and torque to 1 Nm (10 in lbs.). Then torque bolts to 22 Nm (200 in.lbs.) in sequence shown. Then torque again to 22 Nm (200 in.lbs.). After intake manifold is in place, inspect to make sure seals are in place.

EXHAUST MANIFOLD TORQUE





NOTE: New manifold to cylinder head fasteners are recommended.

1. Position exhaust manifold (5) on cylinder head and install bolts to center runner (cylinder #3) and initial tighten to 2.8 Nm (25 in. lbs.).




NOTE: Inspect crossover pipe fasteners for damage from heat and corrosion. The cross-over bolts are made of a special stainless steel alloy. If replacement is required, OEM bolts are highly recommended.

2. Using a new gasket, attach crossover pipe to exhaust manifold and tighten bolts (2) to 41 Nm (30 ft. lbs.).
3. Install the remaining manifold attaching bolts. Tighten all bolts to 28 Nm (250 in. lbs.).