Silverado 2500 4WD V8-6.6L DSL Turbo (2010)
Valve Guide Seal: Service and Repair
Valve Stem Oil Seal and Valve Spring Replacement
Special Tools
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J 26999 Compression Gauge
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J 26999-20 Compression Gauge 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. Refer to Engine Coolant Fan Lower Shroud Replacement (Mechanical) (See: Cooling System/Fan
Shroud/Service and Repair) and Engine Coolant Fan Upper Shroud Replacement (LMM Diesel) (See: Cooling System/Fan Shroud/Service and
Repair)Engine Coolant Fan Upper Shroud Replacement (Mechanical) (See: Cooling System/Fan Shroud/Service and Repair).
2. Remove the valve rocker arm shaft, valve bridges, and pushrods for the cylinder head being serviced. Refer to Valve Rocker Arm, Shaft, and Push
Rod Replacement (See: Camshaft, Lifters and Push Rods/Rocker Arm Assembly/Service and Repair).
3. Remove the glow plug for the cylinder requiring service. Refer to Glow Plug Replacement - Bank 1 (See: Powertrain Management/Glow Plug
System/Glow Plug/Service and Repair/Glow Plug Replacement - Bank 1) or Glow Plug Replacement - Bank 2 (See: Powertrain
Management/Glow Plug System/Glow Plug/Service and Repair/Glow Plug Replacement - Bank 2).
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 .
Note: 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.
5. 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.
Warning
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.
7. Install J 44646 to the rocker arm bosses on the cylinder head.