49. 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 Tools and Equipment.




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
Refer to Thread Repair 65. Thread Repair or Thread Repair Specifications Thread Repair Specifications.




3. Inspect the cylinder head for warpage. Refer to Engine Mechanical Specifications .




4. Use the J 9666 - tester in order to measure the valve spring tension. Refer to Engine Mechanical 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 48. Cylinder Head Disassemble.