Cylinder Head Assembly: Specifications

Cylinder Head Specifications

3.8L ENGINE

General Description:

Cylinder Block:

Cylinder Head:

Valves:

Valve Seat:

Valve Guide:

Valve Margin:

Valve Stem Diameter:

Valve Stem to Guide Clearance:

Valve Spring:

SPECIFICATIONS - TORQUE





The cylinder head bolts should be examined BEFORE reuse. If the threads are necked down, the bolts must be replaced.
Necking can be checked by holding a scale or straight edge (2) against the threads. If all the threads do not contact the scale (2) the bolt should be replaced.




Tighten the cylinder head bolts 1-8 in the following sequence. Using the 4 step torque turn method, tighten according to the following values:
- 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 1/4 Turn. (Do not use a torque wrench for this step.)

NOTE: Bolt torque after 1/4 turn should be over 122 Nm (90 ft. lbs.). If not, replace the bolt.




Lower Intake Torque Sequence




Upper Intake Torque Sequence

Exhaust Manifold

Tighten all bolts to 23 Nm (200 in. lbs.)