Note: To adjust the valve clearances the camshafts must be removed. Follow the camshaft removal procedure.
1. Remove the camshafts (see Camshaft - removal).
2. Remove the tappet bucket from the cylinder head.
3. Remove the shim from the valve head.
1. Tappet bucket; 2. Shim
Note: The shim may withdraw with the tappet bucket.
4. Measure the original shim, using a micrometer and select the appropriate new shim as required.
- Clearance too small: fit a thinner shim.
- Clearance too large: fit a thicker shim.
Note: Shims are available ranging from 1.70 mm to 3.00 mm in increments of 0.025 mm.
5. Fit the new shim to the valve head.
6. Lubricate the tappet bucket(s) with a 50/50 solution of engine oil and molybdenum disulphide grease.
7. Refit the tappet bucket.
8. Refit the camshafts (see Camshaft - installation and timing).
9. Re-check all valve clearances.
10. Repeat the procedure if the valves require further adjustment.
11. Fit the camshaft cover (see Camshaft cover - installation).