Silverado 3500 2WD V8-6.6L DSL Turbo VIN 2 (2004)
Valve Spring: Service and Repair
Valve Stem Oil Seal and Valve Spring Replacement
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Tools Required
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J 26999 Compression Gage
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J 26999-20 Compression Gage Adapter
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J 44646 Valve Spring Compressor
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J 44640 Valve Stem Seal Installer
Removal Procedure
1. Remove the upper and lower fan shroud.
2. Remove the valve rocker arm shaft, valve bridges, and pushrods for the cylinder head being serviced.
3. Remove the glow plug for the cylinder requiring service.
4. In order to apply shop air to the cylinders use the following procedures to modify J 26999-20 (1) and J 26999 (2):
1. Remove the valve core from J 26999-20 to allow air to flow.
2. Remove the quick connect fitting from J 26999.
3. Adapt the quick connect fitting in order to use for shop air.
4. Connect the quick connect fitting to J 26999-20.
5. Important: Rotate the cylinder to be serviced to the bottom of the stroke. This is to ensure that the engine does not rotate when the compressed
air is applied to the cylinder being serviced.
Install J 26999-20 into the glow plug hole for the cylinder being serviced.
6. Apply compressed air to hold the valves in place. If the compressed air is released, the valves can drop into the cylinder.
7. Caution: Compressed valve springs have high tension against the valve spring compressor. Valve springs that are not properly
compressed by or released from the valve spring compressor can be ejected from the valve spring compressor with intense force. Use care
when compressing or releasing the valve spring with the valve spring compressor and when removing or installing the valve stem keys.
Failing to use care may cause personal injury.
Install J 44646 to the rocker arm bosses on the cylinder head. J 44646 should be installed in the rocker arm boss next to the cylinder being
serviced. The pivot pin can be removed from the stand to allow the stand to be installed. The lever has different locating holes for the pivot pin
depending on available clearance. The lever is also notched for different locations of the compressor.
8. Using J 44646 compress the valve spring.
