Checking and adjusting valve clearance (Discovery 3)

Examination

1. Disconnect the ground cable from the battery.

2. Remove the cooling fan. Cooling Fan (26.25.19)

3. Remove the left cylinder head cover. Left valve cover (12.29.43)

4. Remove the right cylinder head cover. Right valve cover (12.29.44)

5.

CAUTION: The camshaft lobes must be rotated 180 degrees from the corresponding valve lifters, otherwise the valve clearance will be incorrect.

Turn the engine crankshaft clockwise until the camshaft lobe moves away from the valve lifter.

6. Using a feeler gauge, measure the clearance between the camshaft and the valve lifter.



7. Repeat the above procedure for the remaining 31 valve lifters.

8. Adjust the gap if necessary.

9. For cylinder head parameters, see technical specifications.

10. Install the right cylinder head cover. Right valve cover (12.29.44)

11. Install the left cylinder head cover. Left valve cover (12.29.43)

12. Install the cooling fan. Cooling Fan (26.25.19)

13. Connect the ground cable to the battery. Specification.

Adjustment

NOTE: Adjusting the valve clearances is part of the camshaft removal and installation procedure.

1. Remove the camshafts. Right camshafts (12.13.20)

2. Install the camshafts. Right camshafts (12.13.20)