Removal Procedure

NOTE:

Prevent the crankshaft from rotating clockwise or counterclockwise before using compressed air in the cylinder. Rotation of the crankshaft may cause damage to EN-43653 holding tool.

If equipped with a manual transmission, leave the transmission in first gear with the vehicle on the ground and the parking brake set.
If equipped with an automatic transmission, remove the starter. Refer to Starter Replacement (LTG) , Starter Replacement (LKW) .
Install EN-43653 holding tool.
Remove the camshaft. Refer to Intake Camshaft Replacement (LKW) , or Camshaft Position Actuator and Camshaft Replacement - Exhaust (LTG) , Camshaft Position Actuator and Camshaft Replacement - Exhaust (LKW) .

Fig 1: View Of Valve Spring Compressor Adaptor Set

Courtesy of GENERAL MOTORS COMPANY

Install the EN-43649-10 adaptor set (1) to the front and rear of the cylinder head.
Install the cross bars and locks (2) of the EN-43649 compressor to the valve spring compressor adaptors.
Remove the spark plugs. Refer to Spark Plug Replacement .
Install an air hose adapter into the spark plug hole.
Attach an air hose to the adapter and pressurize the cylinder to 690 kPa (100 psi).
Compress the valve spring using the valve spring compressor (3).

Fig 2: View Of Valve Spring, Keepers & Retainer

Courtesy of GENERAL MOTORS COMPANY

Remove the valve spring keepers (1).
Remove the valve spring (3) and retainer (2).

Fig 3: View Of Valve Guide Seal Remover/Installer

Courtesy of GENERAL MOTORS COMPANY

Use the EN-36017 seal remover (1) to remove the valve seal.