Active Fuel Management Valve Lifters
WARNING: This page does not describe the selected car, but rather 6 other vehicles, including the 2018 GMC Yukon XL, 2018 GMC Yukon, 2018 Chevrolet Tahoe, 2018 Chevrolet Suburban, and 2018 Cadillac Escalade ESV. However, it is still accessible from the selected car via links, so may be relevant.
- Clean the components in cleaning solvent.
- Dry the components with compressed air.
- Inspect the valve lifters for the following conditions:
- Broken or collapsed spring (1)
- Worn pushrod socket (2)
- Plugged lubrication hole (3)
- Plugged lifter oil-switching hole (4)
- Flat spots on the roller (5)
- Worn or damaged roller bearing (6)
The roller should rotate freely with no binding or roughness.
- Scuffed or worn sides (7)
NOTE:
Components that are to be used again must be marked, sorted or organized for assembly.
WARNING:
Refer to Safety Glasses and Compressed Air Warning .