Renew

Cylinder Head Casting, Renew

- Remove the cylinder head, see Cylinder Head Gasket Service and Repair.

- Place the cylinder head on suitable blocks on a bench.

- Remove the spark plugs.

- Remove the intake valve camshaft cap securing bolts.

- Remove the camshaft caps.

- Remove the camshaft.

- Repeat the procedure for the exhaust camshaft.

- Remove the cam followers and shims, noting the positions for reassembly.

- Remove the valves using Service Tool MS 1519A valve spring compressor.

- Remove the seals from the intake and exhaust valve guides.

- Remove the rear blanking plate.

- Clean all components and examine for wear and damage.

- Renew any worn or damaged parts as necessary.

- Clean thoroughly the new cylinder head casting.

- Refit the rear blanking plate to the new cylinder head.

- Smear fine grinding compound on to the face of one valve. Oil the valve stem. Fit the valve to the head. Lightly lap the valves into the seats, leaving a smooth finish to both surfaces. Clean the valve and seat. Repeat the procedure for the remaining valves.

Note: Excessive lapping will groove the valve face, resulting in poor seating when hot.

- Fit a new seal to one valve guide. Lubricate the valve stem. Fit the valve to the guide. Fit the spring seat, spring and collar. Fit Service Tool MS 1519A spring compressor to the valve. Compress the valve spring, fit and seat the collets, and release the clamp. Repeat the procedure for the remaining valves.

- Refit the shims.

- Ensure that the shims are seated correctly.




- Lubricate and fit the cam followers (Fig. 1).

- Lubricate the camshafts and bearings.

- Fit the camshafts.

- Fit the camshaft caps.

- Fit and torque tighten the camshaft cap securing bolts.




- Measure the valve clearance between the heel of the cam and the cam follower (Fig. 2), turning the camshaft as necessary to measure all the clearances, see Valve Clearance Adjustment.

Note: A final check of the valve clearances should be done when the cylinder head is fitted and torque tightened to the cylinder block.

- Clean the cylinder head thoroughly and check the cylinder head and cylinder block for warping, bowing or cracks. Renew if necessary.

- Fit a new cylinder head gasket and fit the cylinder head assembly to the cylinder block see Cylinder Head Gasket Service and Repair.