45. Cylinder Head Clean and Inspect

Cylinder Head Cleaning and Inspection

^ Tools Required
- J 8089 Carbon Removing Brush
- J 9666 Valve Spring Tester





1. CAUTION: Refer to Safety Glasses Caution in Service Precautions.

Important: When cleaning a cylinder head in a thermal type oven, do not exceed 204°C (400°F).

Clean the following components:

^ Important: Be careful not to scuff the chamber.

Use the J 8089 in order to remove the carbon from the combustion chambers.

^ Gasket surfaces
^ Valve stems and heads on a buffing wheel
^ Bolt hole threads Remove all dirt, debris, or threadlocking material from the bolt holes.





2. Inspect for the following conditions:
1 The cylinder head (218) for cracks in the exhaust ports and combustion chambers
2 The cylinder head for external cracks in the water chambers
3 The gasket surfaces for excessive scratches or gouging
4 The bolt hole threads for debris or damaged threads





3. Inspect the cylinder head for warpage.





4. Inspect the valve springs for squareness.





5. Use the J 9666 in order to measure the valve spring tension.
^ Replace the LS1 spring if the spring tension is less than 310 N (70 lbs.) at 45.75 mm (1.80 inch).
^ Replace the LS6 spring if the spring tension is less than 400 N (90 lbs.) at 45.75 mm (1.80 inch).