Disassemble

- Remove the cylinder head.
- Remove the inlet and exhaust manifolds from the cylinder head.
- Discard the gaskets and thoroughly clean the mating faces, taking great care not to damage the castings.

Cap ID Marks:

- Remove the four bearing caps from each camshaft. Note the mating marks (1) on each bearing cap.
- Lift out the camshafts.
- Withdraw the tappets and lay them out in order to ensure the correct replacement.
- Remove the adjusting pads from each valve stem and place them with their respective tappets.

Special Tool:

- Make up a wooden block to the dimensions given and use it to support the valves.

Valve Spring Tool:

- Compress the valve spring using service tool JD 61 18C, or equivalent, and extract the cotters.
- Remove the collars, valve springs, and spring seats.
- Remove the oil seal from the stem of the inlet valves before removing the spring seat.
- Number the valves as you remove them. They should be replaced in original locations, if re-used.
- Remove all traces of carbon from the combustion chambers and deposits from the intake and exhaust ports. Great care must be taken to avoid damaging the head.