Cylinder Head Assembly: Service and Repair

Removal
1. Rocker arm cover and gasket
2. Oil seals
3. Blind cover

Note:
After removing the blind cover, install the chain adjuster guide (49 3953 260) to prevent the slipper head of the chain adjuster from popping out.

4. Lock nut (distributor drive gear) Use the brake (49 0118 271A)
5. Camshaft spacer
6. Bolt (cylinder head to cylinder block)
7. Cylinder head bolts

Note:
To avoid the cylinder head distortion, loosen the bolts a few turns at a time until they are all loose.

8. Rocker arm assembly
9. Camshaft and bearings
10. Camshaft sprocket





11. Cylinder head and gasket

Note:
When removing only the camshaft or the cylinder head, the timing chain should be lifted upward to prevent the slipper head of the chain adjuster from flying out and causing a difficulty in adjusting the timing chain.





Checking Cylinder Head
Check to see the water passages are open. Inspect the tapped openings. Repair or replace any damaged threads or broken studs.

Check for cylinder head distortion by placing a straight edge on the cylinder head surface. Measure the clearance between the straight edge and the cylinder head surface with a feeler gauge.

If the distortion exceeds 0.15 mm (0.006 in), grind with a surface grinder or replace the head.

Cylinder head height 109 +/- 0.05 mm (4.291 +/- 0.002 in)
Grinding Limit 0.20 mm (0.008 in)

Installation
1. Hold the camshaft sprocket and chain securely with a hand and rotate the cylinder block upside down.
2. Place the sprocket and the chain on the top of the chain guide strip and vibration damper.

Note:
Ensure that the tally marks of both the camshaft sprocket and the chain are engaged properly.

3. Place a new gasket on the cylinder block.
4. Position the cylinder head on the cylinder block, aligning the dowels.