Tools Required
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 the Preface section.
| Important: Be careful not to scuff the chamber.
|
• | Use the
J 8089
in order to remove the carbon from the combustion chambers. |
• | Valve stems and heads on a buffing wheel |
• | Remove all dirt, debris, or threadlocking material from the bolt holes. |
- Inspect the following components:
2.1. | The cylinder head (218) for cracks in the exhaust ports and combustion chambers |
2.2. | The cylinder head for external cracks in the water chambers |
2.3. | The gasket surfaces for excessive scratches or gouging |
Refer to
Replacing Engine Gaskets
.
2.4. | The bolt hole threads for debris or damaged threads |
Refer to
Thread Repair
or
Thread Repair Specifications
.
- Inspect the cylinder head for warpage. Refer to
Engine Mechanical Specifications
.
- Inspect the valve springs for squareness.
- 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 in).