Removal Procedure

WARNING: This page is about a different car, the 2019 GMC Savana 3500, 2019 GMC Savana 2500, 2019 Chevrolet Express 3500, and 2019 Chevrolet Express 2500. However, it is still accessible from the selected car via links, so may be relevant.

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Remove the valve rocker arm. Refer to Valve Rocker Arm and Push Rod Replacement .
Disconnect the spark plug wire at the spark plug.
- Twist each plug wire boot 1/2 turn.
- Pull only on the boot in order to remove the wire from the spark plug.
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NOTE:
Remove the spark plugs from the cylinder head with the engine at room temperature.

Loosen the spark plug 1 or 2 turns.
Brush or air blast away any dirt or debris from around the spark plug.
Remove the spark plug.
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Install J 22794 Spark Plug Port Adapter into the spark plug hole.
Attach an air hose to J 22794 Spark Plug Port Adapter.
Apply compressed air to J 22794 Spark Plug Port Adapter in order to hold the valves in place.
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Use J 38606 Valve Spring Compressor in order to compress the valve spring.
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Remove the valve stem keys (2).
Carefully release the valve spring tension.
Remove the J 38606 Valve Spring Compressor.
Remove the valve spring cap (3).
Remove the valve spring (4).
Remove the valve stem oil seal and shim (1, 5).