Cleaning & Inspection Procedure

WARNING: This page is about a different car, the 2009 GMC Sierra, 2009 GMC Cab & Chassis Sierra, 2009 Chevrolet Silverado, and 2009 Chevrolet Cab & Chassis Silverado. However, it is still accessible from the selected car via links, so may be relevant.

Fig 1: View Of Carbon Removal Using J 8089

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WARNING: Refer to Safety Glasses Warning .

NOTE:

When cleaning a cylinder head in a thermal type oven, do not exceed 204°C (400°F).
Be careful not to scuff the chamber.

Clean the following components:
- Use the J 8089: brush in order to remove the carbon from the combustion chambers.
- Gasket surfaces
  Refer to 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.
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 .
4. Bolt hole threads for debris or damaged threads
  Refer to Thread Repair or Thread Repair Specifications .

Fig 2: Inspecting Cylinder Head For Warpage

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Inspect the cylinder head for warpage. Refer to Engine Mechanical Specifications (RPO LY5 VIN J) , Engine Mechanical Specifications (RPO LC9 VIN 3) , Engine Mechanical Specifications (RPO LY2 VIN C) , Engine Mechanical Specifications (RPO LH6 VIN M) , Engine Mechanical Specifications (RPO LMG VIN 0) , Engine Mechanical Specifications (RPO LY6 VIN K) , Engine Mechanical Specifications (RPO L76 VIN Y) or Engine Mechanical Specifications (RPO L9H) .

Fig 3: Measuring Valve Spring Tension

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Use the J 9666: tester in order to measure the valve spring tension. Refer to Engine Mechanical Specifications (RPO LY5 VIN J) , Engine Mechanical Specifications (RPO LC9 VIN 3) , Engine Mechanical Specifications (RPO LY2 VIN C) , Engine Mechanical Specifications (RPO LH6 VIN M) , Engine Mechanical Specifications (RPO LMG VIN 0) , Engine Mechanical Specifications (RPO LY6 VIN K) , Engine Mechanical Specifications (RPO L76 VIN Y) or Engine Mechanical Specifications (RPO L9H) .

Fig 4: Identifying Core Plug

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Inspect for a leaking plug (1) at the top rear coolant passage of each cylinder head. If service of a leaking plug is required, it is necessary to remove the cylinder head from the engine to properly remove the plug. Refer to Cylinder Head Disassemble .