Cylinder Head Disassemble - Off Vehicle

WARNING: This page is about a different variant/trim than selected.

Tools Required

J 8062 Valve Spring Compressor
J 38820 Valve Stem Seal Installer. See Special Tools .
J 38821 Valve Spring Compressor Adapter. See Special Tools .
J-43059-A Valve Retainer Remover/Installer. See Special Tools .

Fig 1: Loosening Valve Keepers

Courtesy of GENERAL MOTORS CORP.

Using an appropriately sized deep socket and a plastic hammer, lightly tap on the valve spring retainer in order to loosen the valve keepers.

Fig 2: Compressing Valve Spring

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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.

NOTE: Do not compress the valve springs less than 24.0 mm (0.943 in). Contact between the valve spring retainer and the valve stem oil seal can cause potential valve stem oil seal damage.

Compress the valve spring with the J 8062 (2) and the J 38821 (1). See Special Tools .

Fig 3: Removing Valve Keepers Using J 43059

Courtesy of GENERAL MOTORS CORP.

Use the magnet of the J-43059-A in order to remove the valve keepers. See Special Tools .
Remove the J 8062 and the J 38821 . See Special Tools .

Fig 4: View Of Valve Spring

Courtesy of GENERAL MOTORS CORP.

Remove the valve spring.

Fig 5: Removing/Installing Valve Seal

Courtesy of GENERAL MOTORS CORP.

Remove the valve seal with the J 38820 . See Special Tools . Discard the valve seal, NEVER re-use the valve seal.
Remove the valve.
Repeat the procedure for the remaining valves.

Fig 6: Engine Coolant Expansion Plug

Courtesy of GENERAL MOTORS CORP.

Remove and discard the engine coolant expansion plugs.

Fig 7: Inspecting Engine Coolant Expansion Plug Bore

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Inspect the engine coolant expansion plug bore of the cylinder head. Ensure the hole is concentric, within specifications (1) and not damaged/corroded (2). Replace the cylinder head if necessary.

Fig 8: Identifying Oil Gallery Threaded Plugs

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Remove the oil gallery threaded plugs.

Fig 9: Oil Gallery Threaded Plug Holes

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Inspect the oil gallery threaded plug hole threads of the cylinder head. Ensure the threads (1) are serviceable and the washer sealing surface (2) is flat and free of defects. Repair the threads in the cylinder head if necessary.

Fig 10: View Of Oil Gallery Threaded Plug

Courtesy of GENERAL MOTORS CORP.

Inspect the oil gallery threaded plugs. Ensure the threads (1) are serviceable and the washer sealing ring surface (2) is flat and free of defects. Replace the oil gallery threaded plugs if necessary.

Fig 11: Identifying Core Hole Threaded Plugs

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Remove the core hole threaded plugs.

Fig 12: Identifying Washer Sealing Surface

Courtesy of GENERAL MOTORS CORP.

Inspect the core hole threads of the cylinder head. Ensure the threads (1) are serviceable and the washer sealing surface (2) is flat and free of defects. Repair the threads in the cylinder head if necessary.

Fig 13: View Of Core Hole Threaded Plug

Courtesy of GENERAL MOTORS CORP.

Inspect the core hole threaded plugs. Ensure the threads (1) are serviceable and the washer sealing ring surface (2) is flat and free of defects. Replace the core hole threaded plugs if necessary.