Valve Lifter and Guide Cleaning and Inspection RPO LY2/LY6/L92
Valve Lifters
Important: Components that are to be used again must be marked, sorted or organized for assembly.
- Clean the components in cleaning solvent.
Caution: Refer to Safety Glasses and Compressed Air Caution in the Preface section.
- Dry the components with compressed air.
- Inspect the valve lifters for the following conditions:
| • | Bent or broken clip (1) |
| • | Worn pushrod socket (2) |
| • | Scuffed or worn sides (3) |
| • | If the valve lifter shows wear, inspect the engine block lifter bores for wear or damage. |
| • | Flat spots on the roller (4) |
| • | Loose or damaged pin (5) |
| • | Worn or damaged roller bearing |
| • | The roller should rotate freely with no binding or roughness. |
Valve Guides
Inspect the valve lifter guides for the following conditions:
| • | Excessive wear in the lifter mounting bores |
Valve Lifter and Guide Cleaning and Inspection RPO LC9/LY5/LMG/L76
Non Active Fuel Management Valve Lifters
Important: Components that are to be used again must be marked, sorted or organized for assembly.
- Clean the components in cleaning solvent.
Caution: Refer to Safety Glasses and Compressed Air Caution in the Preface section.
- Dry the components with compressed air.
- Inspect the valve lifters for the following conditions:
| • | Bent or broken clip (1) |
| • | Worn pushrod socket (2) |
| • | Scuffed or worn sides (3) |
| • | If the valve lifter shows wear, inspect the engine block lifter bores for wear or damage. |
| • | Flat spots on the roller (4) |
| • | Loose or damaged pin (5) |
| • | Worn or damaged roller bearing |
| • | The roller should rotate freely with no binding or roughness. |
Active Fuel Management Valve Lifters
Important: Components that are to be used again must be marked, sorted or organized for assembly.
- Clean the components in cleaning solvent.
Caution: Refer to Safety Glasses and Compressed Air Caution in the Preface section.
- 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) |
Valve Guides
Inspect the valve lifter guides for the following conditions:
| • | Excessive wear in the lifter mounting bores |
