44. Cylinder Head Cleaning and Inspection

Cylinder Head Cleaning and Inspection
Tools Required
^ J 8089 Carbon Removal Brush
^ J 9666 Valve Spring Tester





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

Clean the following components:

^ Caution: Refer to Safety Glasses Caution in Service Precautions.

Important: Be careful not to scuff the chamber.

Use the J 8089 in order to remove the carbon from the combustion chambers.
^ Gasket surfaces Refer to Replacing Engine Gaskets.
^ Valve stems and heads on a buffing wheel
^ Bolt hole threads Remove all dirt, debris, or threadlocking material from the bolt holes.





2. Inspect the following components:
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 Refer to Replacing Engine Gaskets.
4 The bolt hole threads for debris or damaged threads Refer to Thread Repair or Thread Repair Specifications.





3. Inspect the cylinder head for warpage. Engine Mechanical Specifications (LR4 VIN V) Engine Mechanical Specifications (LM7 VIN T) Engine Mechanical Specifications (L33 VIN B) Engine Mechanical Specifications (L59 VIN Z) Engine Mechanical Specifications (LQ4 VIN U) Engine Mechanical Specifications (LQ9 VIN N).





4. Inspect the valve springs for squareness.





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