Cylinder Head Assembly: Testing and Inspection

- Tools Required
- J 9666 Valve Spring Tester
- J 8001 Dial Indicator
- J 8089 Carbon Removal Brush





1. Use the J 8089 in order to clean the carbon from the combustion chambers and the valve parts. Be careful not to scuff the chamber.
2. Clean the following areas:
a. The carbon and the sludge from the valve pushrods and the valve rocker arms
b. The valve stems and heads on a buffing wheel
c. The cylinder head and engine block gasket surfaces
d. The bolt hole threads in the cylinder heads and the engine block
3. Inspect the following areas:
a. The cylinder head for cracks in the exhaust ports end combustion chambers
b. The cylinder head for external cracks in: the water chamber
c. The valves for burned heads, cracked faces, or damaged stems
d. The valve springs for squareness





4. Use the J 9666 in order to measure the valve spring.
- Replace the spring if the spring tension is less than 338 N (76 lb) at 43.2 mm (1.70 inch).





5. Measure the valve stem-to-bore clearance.
- Excessive valve stem-to-bore clearance will cause an excessive oil consumption and may case 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 contract the side of the valve stem just above the valve guide.
- Drop the valve head about 1.6 mm (0.0064 inch) off the valve seat.
- Use light pressure when moving the valve stem from side to side in order to obtain a clearance reading.