Removal Procedure

WARNING: This page is about a different car, the 2019 Buick Cascada, 2018 Buick Cascada, and 2017 Buick Cascada. However, it is still accessible from the selected car via links, so may be relevant.

Spark Plug - Remove - Spark Plug Replacement .
Hydraulic Valve Lash Adjuster Arm - Remove - Hydraulic Valve Lash Adjuster Arm Replacement .
Install EN-51511 plug (1) to the fuel injector bore of cylinder 1.
Tighten the bolt (2) of EN-51511 plug.
Install the EN-49074 valve spring compressor (1) including the EN-49155 demounting piece (2) to the cylinder head.
Install the EN-51150 compression / pressure adapter (1) into the spark plug thread from cylinder 1.

NOTE:

Make sure that the crankshaft is in the ignition top dead center (TDC) position of cylinder 1.

Attach a compression air hose to the EN-51150 compression/pressure adapter.
Apply compressed air to cylinder 1.
Tap all valve spring retainers, only from cylinder 1, with a soft hammer hit. Use a rubber mallet and EN-6171 release tool (1).
NOTE:
The demounting piece must be applied parallel to the valve spring retainers to prevent damage to the tools or the valve train components.

Scale the valve spring (3), including the upper valve spring retainers (2) down and the upper valve spring retainers until the valve keys are discharged from spring load. Use a suitable tool and a bit of grease to remove the valve keys (1).
NOTE:
Mind the installation position of valve springs, valve spring retainers and valve keys.

Remove the exhaust valve spring (1) or the intake valve spring (3) and a upper valve spring retainer (2). Which valve spring is removed, depends on the removal progress.
Remove and DISCARD the valve stem oil seal. Use EN-840 pliers (1).
Repeat the procedure for the other 3 valves form cylinder 1.
Transfer the special tools as needed.