Cylinder Head Assembly: Testing and Inspection

^ Tools Required
- J 9666 Valve Spring Tester
- J 8001 Dial Indicator
- J 8089 Carbon removing Brush
- Or Equivalents

1. Inspect the following areas:
a. The cylinder head for cracks in the exhaust ports and 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





2. Use the valve spring tester (J 9666) in order to measure the valve spring.
^ Replace the intake valve spring if the spring tension is less than 360 Nm (81 lbs.) at 45.2 mm (1.78 inch).
^ Replace the exhaust valve spring if the spring tension is less than 425 Nm (96 lbs.) at 45.2 mm (1.78 inch).





3. Measure the valve stem-to-bore clearance.
^ Excessive valve stem-to-bore clearance will cause an excessive oil consumption and may 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 dial indicator 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 inch) off the valve seat.
^ Use light pressure when moving the valve stem from side to side in order to obtain a clearance reading.