Cylinder Head Assemblies
NOTE:
A Cylinder Head Assembly is a cylinder head fitted with valves, associated springs, retainers, and on overhead camshaft cylinder heads (ORC), camshaft, camshaft bearings, lash adjusters, tappets and rockers.
| Condition | Code | Procedure |
|---|---|---|
| Adjustable valve lash is out of specification | B | Require repair |
| Combustion efficiency is reduced due to carbon deposits in the combustion chamber | 2 | Suggest repair |
| Combustion efficiency is reduced due to carbon deposits on the intake valve | 2 | Suggest repair |
| Internal component failure (any component) | A | Require repair or replacement of cylinder head assembly |
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NOTE:
It is Required that all other failure-related components be inspected for cause and condition. Additional components or assemblies may be Suggested for repair or replacement, such as a water pump on a short block ( reason code 4, technician's recommendation based on substantial and informed experience ). For example: If there is a failed head gasket with an external coolant leak, in addition to Requiring replacement of the head gasket, inspection of the following for cause and condition is Required: Block, Cooling System, Cylinder Head. It may be suggested that additional inspections be performed, such as the other head gasket on a V -type engine.
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