Cylinder Head Clean and Inspect
^ Tools Required- J 8001 Dial Indicator
- J 8089 Carbon Removal Brush
- J 9666 Valve Spring Tester
1. Use the J 8089 in order to clean the carbon from the combustion chambers. Be careful not to scuff the chambers.
2. Clean the valve stems and heads of a buffing wheel.
CAUTION: Wear safety glasses in order to avoid eye damage.
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 inch) within a 152.4 mm (6.0 inch) area must be repaired or replaced.
5.2. A cylinder head exhaust manifold deck with warpage in excess of 0.5 mm (0.002 inch) within a 152.4 mm (6.0 inch) area must be repaired or replaced.
5.3. A cylinder head intake manifold deck with warpage in excess of 0.10 mm (0.004 inch) within a 152.4 mm (6.0 inch) 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 Nm (76 lbs.) at 43.2 mm (1.70 inch).
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 inch) off the valve seat.
^ Use light pressure when moving the valve stem from side to side in order to obtain a clearance reading.