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 - Refer to Thread Repair Thread Repair or Thread Repair Specifications Thread Repair Specifications.





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





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





5. Inspect for a leaking plug. Second design applications use a rivet-type 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 Cylinder Head Disassemble.