48. Cylinder Head Cleaning and Inspection

Cylinder Head Cleaning and Inspection

Special Tools

* J 8089 - Carbon Removal Brush

* J 9666 - Valve Spring Tester

For equivalent regional tools, refer to Special Tools Special Tools.





Warning:
Refer to Safety Glasses Warning Safety Glasses Warning.


Note:

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

* Be careful not to scuff the chamber.

1. Clean the following components:

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

* Gasket surfaces

Refer to Replacing Engine Gaskets 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 cylinder head for the following conditions:

1. Cracks in the exhaust ports and combustion chambers

2. External cracks in the water chambers

3. Gasket surfaces for excessive scratches or gouging

Refer to Replacing Engine Gaskets Replacing Engine Gaskets.

4. Bolt hole threads for debris or damaged threads






3. Inspect the cylinder head for warpage. Refer to Engine Mechanical Specifications (L77) Service Limits & General Specifications.





4. Use the J 9666 - tester in order to measure the valve spring tension. Refer to Engine Mechanical Specifications (L77) Service Limits & General Specifications.





5. Inspect for a leaking plug (1) at the top rear coolant passage of each cylinder head. If service of a leaking plug is required, it is necessary to remove the cylinder head from the engine to properly remove the plug. Refer to Cylinder Head Disassemble 47. Cylinder Head Disassemble.