Valve Clearance: Adjustments

NOTE: Special Tools Required:
5022, 5026.

Upper Engine View:

CHECK VALVE CLEARANCE
Remove ignition cables from spark plugs.
Remove valve cover.

Crankshaft Pulley Markings:

Position camshaft at TDC for cylinder 1:
- Cam lobes for cyl. 1 must point obliquely upwards.
- Pulley ignition mark must be at O°.

NOTE: Always use center bolt to rotate crankshaft.

Checking Valve Clearance:

Measure and note valve clearance for cyl. 1.

NOTE: Same clearance for intake and exhaust valves.

Clearance when checking:
Cold engine: 0.30-0.40 mm (0.012-0.016 in)
Hot engine: 0.35-0.45 mm (0.014-0.018 in)

Valve Adjustment Sequence:

Check and note valve clearance of remaining cylinders:
- Turn crankshaft 180 degrees clockwise and check cyl. 3
- Turn crankshaft 180 degrees clockwise and check cyl. 4
- Turn crankshaft 180 degrees clockwise and check cyl. 2






ADJUST VALVE CLEARANCE
Clearance when adjusting:
Cold engine: 0.35-0.40 mm (0.014-0.016 in)
Hot engine: 0.40-0.45 mm (0.016-0.018 in)

Turn camshaft to "clearance checking" position.
Remove adjustment washer:
- Rotate the tappets so that the groove is completely to side.
- Use press tool 5022 to depress tappets.
- Use pliers 5026 to remove washer.

Washer (Shim) Selection Example:

Valve Washer (Shim) Measurement:

Select adjustment washer of correct thickness:
- Washers are available in thicknesses of 3.30-4.50 mm (0.13-0.18 in) at increments of 0.05 mm (0.002 in).
- Only use new washers.
- Use micrometer to measure thickness of old washer.

Valve Washer (Shim) Installation:

Oil and install new washer:
- Turn washer with marking pointing downwards.
Remove press tool 5022

- Turn engine over a few times with starter motor.
- Then check clearance again.
- Adjust if necessary.

Valve Cover & Gasket:

REINSTALL:
Install valve cover:
- Use new gasket.

Upper Engine View:

Connect ignition cables.
Install parts, as applicable.

Check/adjust:
- ignition
- CO-content
- idle speed