Cylinder Head Assembly

CYLINDER HEAD






CYLINDER HEAD TORQUE AND SEQUENCE

The cylinder head bolts are tightened using a torque plus angle procedure. The bolts must 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 against the threads. If all the threads do not contact the scale the bolt must be replaced.





NOTE: Before installing the cylinder head bolts, lubricate the threads with engine oil.

1. Insert the front four cylinder head bolts into the cylinder head. Pull the bolts up to the top of their travel and retain with rubber bands.
2. Install the cylinder head over locating dowels and finger tighten the head bolts.
3. Tighten the cylinder head bolts in the sequence shown in. Using the 4 step torque-turn method, tighten according to the following torque values:
- Step 1: All to 61 Nm (45 ft. lbs.)
- Step 2: All to 88 Nm (65 ft. lbs.)
- Step 3: All (again) to 88 Nm (65 ft. lbs.)
- Step 4: + 90° Turn Do not use a torque wrench for this step.





4. Bolt torque after 90° turn should be over 122 Nm (90 ft. lbs.) in the tightening direction. If not, replace the bolt.
5. Install the inner timing cover to cylinder head bolts. Tighten bolts to 54 Nm (40 lbs.ft.).





Check cylinder head for flatness (1).

Cylinder head must be flat within:
- Standard dimension = less than 0.05 mm (0.002 inch.)
- Service Limit = 0.2 mm (0.008 inch.)
- Grinding Limit = Maximum of 0.2 mm (0.008 inch.) is permitted.

CAUTION: 0.20 mm (0.008 in.) MAX is a combined total dimension of the stock removal limit from cylinder head and block top surface (Deck) together.


INTAKE MANIFOLD TORQUE AND SEQUENCE





Install intake manifold bolts and gradually tighten in sequence shown until a torque of 28 Nm (250 in. lbs.) is obtained.

ARM-ROCKER / ADJUSTER LASH

Please refer to Cylinder Head Assembly/Rocker Arm Assembly/Service and Repair/Procedures

EXHAUST MANIFOLD TORQUE

Position the exhaust manifold and gasket. Install the retaining bolts. Tighten bolts starting at the center working outward to 23 N.m (200 in. lbs.).