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:
2.1. | Worn or loose valve seats (8 or 11) |
2.2. | The cylinder head for cracks in the exhaust ports and combustion
chambers |
2.3. | The cylinder head for external cracks in the water chambers |
2.4. | The gasket surfaces for excessive scratches or gouging |
Refer to
Replacing Engine Gaskets
.
2.5. | 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).