45. Cylinder Head Cleaning and Inspection

Cylinder Head Cleaning and Inspection


Tools Required
* J 8089 Carbon Removal Brush
* J 9666 Valve Spring Tester






Caution: Refer to Safety Glasses Caution (Safety Glasses Warning) .

Important:
* 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 a commercially available rotary wire 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 above acceptable scratches or gouging.
Refer to Replacing Engine Gaskets (Replacing Engine Gaskets) .
4. Bolt hole threads for debris or damaged threads
Refer to Thread Repair (Overhaul) and Thread Repair Specifications (Specifications) .





3. Check the cylinder head deck and the inlet and exhaust manifold mating surfaces for distortion. Use a set of feeler gauges (1) and a straight edge (2). Check along the length (A), laterally (B) and diagonally (C).
4. Check the flatness of the cylinder block and cylinder head deck surfaces. If the measurement is not within specification, the cylinder block must be replaced. machining is not recommended. Refer to Engine Mechanical Specifications (L76) (Specifications) .




5. Measure the overall height of the cylinder head (A) and ensure it is within the specified limit. Refer to Engine Mechanical Specifications (L76) (Specifications) .