Devin's Silverado Repair Manual2008 Silverado 1500 LS
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50. Cylinder Head Cleaning and Inspection



Cylinder Head Cleaning and Inspection


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



Technical service diagram



Caution: Refer to Safety Glasses Caution .

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 the J 8089 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 (Overhaul) or Thread Repair Specifications (Specifications) .


Technical service diagram



3. Inspect the cylinder head for warpage. Refer to Engine Mechanical Specifications (RPO LY5 VIN J) (Specifications)Engine Mechanical Specifications (RPO LC9 VIN 3) (Specifications)Engine Mechanical Specifications (RPO LY2 VIN C) (Specifications)Engine Mechanical Specifications (RPO LH6 VIN M) (Specifications)Engine Mechanical Specifications (RPO LMG VIN 0) (Specifications)Engine Mechanical Specifications (RPO LY6 VIN K) (Specifications)Engine Mechanical Specifications (RPO L76 VIN Y) (Specifications)Engine Mechanical Specifications (RPO L92 VIN 8) (Specifications) .

Technical service diagram



4. Use the J 9666 in order to measure the valve spring tension. Refer to Engine Mechanical Specifications (RPO LY5 VIN J) (Specifications)Engine Mechanical Specifications (RPO LC9 VIN 3) (Specifications)Engine Mechanical Specifications (RPO LY2 VIN C) (Specifications)Engine Mechanical Specifications (RPO LH6 VIN M) (Specifications)Engine Mechanical Specifications (RPO LMG VIN 0) (Specifications)Engine Mechanical Specifications (RPO LY6 VIN K) (Specifications)Engine Mechanical Specifications (RPO L76 VIN Y) (Specifications)Engine Mechanical Specifications (RPO L92 VIN 8) (Specifications) .