Valve Clearance Adjustment
- Disconnect accelerator linkage and remove valve cover. Turn crankshaft so that both cam lobes of cylinder to be adjusted point upward. Check valve clearances between cam and follower in firing order (1-2-4-5-3). If clearance is greater than 0.002" (0.05 mm) from specifications, select thicker or thinner disc.
- To replace valve adjusting discs, use follower depressor tool (2078) to press follower down, then remove adjusting disc with tool (10-208 or US4476). Insert appropriate disc and recheck clearance. Discs are available in 0.0019" (0.05 mm) increments from 0.1181" (3.0 mm) to 0.1673" (4.25 mm). Thickness is etched on bottom of disc; discs should be assembled with etched mark toward follower.
VALVE CLEARANCES
| Application | Hot In. (mm) | Cold In. (mm) |
|---|---|---|
| Intake | .008-.012 (.20-.30) | .006-.010 (.15-.25) |
| Exhaust | .016-.020 (.40-.50) | .014-.018 (.35-.45) |
NOTE:
Cold settings are given for reference as initial setting after engine rework. Final adjustments are to be made after engine is warm (at least 95°F or 35°C), and checked again after 1000 miles.