Valve Clearance: Service and Repair

VALVE-VALVE CLEARANCE, ADJUST

Removal
1. Remove the timing belt.





2. Remove the camshaft alignment tool.





Note:
^ Measure each valve's clearance at base circle with the lobe pointed away from the tappet, before removing the camshafts. Failure to measure all clearances prior to removing the camshafts will necessitate repeated removal and installation and wasted labor time.

3. Use a feeler gauge to measure each valve's clearance and record its location.

4. Remove the camshafts.





Caution:
^ If the camshaft and valve tappets are to be reused, mark the location of the valve tappets to make sure that they are assembled in their original positions.

5. Remove the valve tappets from the cylinder head.

Note:
^ A midrange clearance is the most desirable:
^ intake: 0.15 mm (0.006 inch)
^ exhaust: 0.3 mm (0.012 inch)

Note:
^ Select tappets using this formula: tappet thickness = measured clearance plus the base tappet thickness minus most desirable thickness.

6. Select tappets and mark installation location.

Installation





Note:
^ Lubricate the valve tappets with SAE 5W-20 Motor Oil.

1. Install the valve tappets.
2. Install the camshafts.





3. Confirm each valve's clearance at base circle with the lobe pointed away from the tappet.





4. Install the camshaft alignment tool.
5. Install the timing belt.