37. Cylinder Head Clean and Inspect

^ Tools Required
- J 9666 Valve Spring Tester
- J 8001 Dial Indicator
- J 8089 Wire 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:
^ The carbon and the sludge from the valve pushrods and the valve rocker arms.
^ The valve stems and heads on a buffing wheel.
^ The cylinder head and engine block gasket surfaces.
^ The bolt hole threads in the cylinder heads and the engine block.
3. Inspect the following areas:
^ The cylinder head for cracks in the exhaust ports and combustion chambers.
^ The cylinder head for external cracks in the water chamber.
^ The valves for burned heads, cracked faces, or damaged stems.
^ 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 321 - 361 Nm (72.8 - 81.2 lbs.) at 40.64 mm (1.600 inch).





5. Measure the valve stem-to-guide clearance.
^ Excessive valve stem-to-guide 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.
^ Ream the intake valve guides for oversize valves if the clearance exceeds 0.053 mm (0.0020 inch) on the intake valve.
^ Ream the exhaust valve guides for oversize valves if the clearance exceeds 0.076 mm (0.0029 inch).