Tools Required

1. Use the J 8089 in order to clean the carbon from the combustion chambers. Be careful not to scuff the chambers.

Caution: Wear safety glasses in order to avoid eye damage.

2. Clean the valve stems and heads of a buffing wheel.



3. Clean the following components in solvent:

•	Valve stem keys (1)

•	Valve spring cap (3)

•	Valve spring (4)

•	Cylinder head

Caution: Wear safety glasses in order to avoid eye damage.

4. Dry the components with compressed air.



5. Measure the cylinder head for warpage with a straight edge and feeler gauge.

5.1.	A cylinder head block deck with warpage in excess of 0.10 mm (0.004 in) within a 152.4 mm (6.0 in) area must be repaired or replaced.

5.2.	A cylinder head exhaust manifold deck with warpage in excess of 0.5 mm (0.002 in) within a 152.4 mm (6.0 in) area must be repaired or replaced.

5.3.	A cylinder head intake manifold deck with warpage in excess of 0.10 mm (0.004 in) within a 152.4 mm (6.0 in) area must be repaired or replaced.




6. Use the J 9666 in order to measure the valve spring.

Replace the valve spring if the spring tension is less than 338 N (76 lb) at 43.2 mm (1.70 in).




7. Inspect the valve springs for squareness.



8. Valve stems (1) with excessive guide (2) clearance must be repaired or replaced.



9. Measure the valve stem-to-guide clearance.

•	Excessive valve stem-to-guide clearance may cause excessive oil consumption and may also cause a valve to break. Insufficient clearance will result in noisy and sticky functioning of the valve and will disturb the engine assembly smoothness.

•	Clamp the J 8001 on the exhaust port side of the cylinder head.

•	Locate the indicator so that the movement of the valve stem from side to side (crosswise to the cylinder head) will cause a direct movement of the indicator stem.

•	The indicator stem must contact the side of the valve stem just above the valve guide.

•	Drop the valve head about 1.6 mm (0.0064 in) off the valve seat.

•	Use light pressure when moving the valve stem from side to side in order to obtain a clearance reading.