Removal Procedure

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

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-50792 Flywheel 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)
1. Install the EN-50792 Flywheel Holding Tool.
Camshaft - Remove Camshaft Position Actuator and Camshaft Replacement - Intake , Camshaft Position Actuator and Camshaft Replacement - Exhaust
Valve Rocker Arm - Remove Intake Valve Rocker Arm Replacement , Exhaust Valve Rocker Arm Replacement
Install the EN-50717 Valve Spring Compressor (1) to the front and rear of the cylinder head as shown.

Fig 1: Valve Spring Compressor
Courtesy of GENERAL MOTORS COMPANY

NOTE: When mounting the valve spring compressor to the cylinder head, a suitable large washer should be used as indicated by the arrow.
Install the cross bars and locks (2) of the EN-50717 Valve Spring Compressor to the valve spring compressor adaptors.
Spark Plug - Remove 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).
Valve Stem Key (1) - Remove

Fig 2: Valve Spring, Keepers And Retainer
Courtesy of GENERAL MOTORS COMPANY
Valve Spring Retainer (2) - Remove
Valve Spring (3) - Remove
Use the EN-37281-A Valve Guide Seal Remover to remove and DISCARD the valve seal.