Cylinder Head Assemble

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.

Special Tools

J-8062 Valve Spring Compressor
J-9666 Valve Spring Tester
EN-50031 Valve Spring Compressor (off-vehicle)
EN-50723 Valve Seal Installer

Equivalent regional tools: Special Tools

Courtesy of GENERAL MOTORS COMPANY

Install NEW cylinder head plugs. Coat the plugs with sealer GM P/N 12345382 (Canadian P/N 10953489) or equivalent.
Tighten plugs to 60 N. m (44 lb ft)
Courtesy of GENERAL MOTORS COMPANY

Assemble the valves.
Use the following steps to measure valve runout:
1. Apply a dab of Prussian blue on the entire valve face. Seat the valve but do not rotate it. The Prussian blue traces transferred to the valve seat are an indication of concentricity of the valve seat.
2. Clean all traces of Prussian blue.
3. Apply a dab of Prussian blue on the valve seat and repeat the check. The traces of Prussian blue transferred to the valve face indicates valve face concentricity.
Courtesy of GENERAL MOTORS COMPANY

Replace the valves, if required.
Courtesy of GENERAL MOTORS COMPANY

Install the NEW valve seals using the EN-50723 installer. Fully seat the seals on the valve guides.
Install the spring (1).
Courtesy of GENERAL MOTORS COMPANY

Install the retainer.
Using the J-8062 compressor and the EN-50031 compressor, compress the valve spring.
Install the valve keys.
Slowly release the J-8062 compressor and the EN-50031 compressor from the valve/spring assembly.
Inspect for proper valve key seating.
Install the remaining valves, springs, and other components.