Note! New and remanufactured cylinder heads are available from both the manufacturer and engine overhaul/rebuilders. You should be aware that some special tools are required for disassembly and inspection and new items may not be available at any given time. Therefore, when doing repairs yourself, it may be more practical and economical to buy a remanufactured head rather than disassembling, inspecting and rebuilding the original head from your engine.
1. Remove the cylinder head as described in chapter 2B or 2B (whichever is applicable) or in paragraph 5 of this chapter (if applicable).
2. Remove intake and exhaust manifolds (see chapter 4B or 4B), if you haven't already done so.
3. Remove the camshaft (-s), valve levers and shims or hydraulic tappets (whichever is applicable), as described in chapter 2B or 2B.
4. Remove the glow plugs as described in chapter 5V, and injectors as described in chapter 4B or 4B.
5. Using a valve spring compressor, compress each valve spring in turn. This will remove the crackers. Release the tool and remove the spring plate and the spring itself. Using pliers, carefully remove the valve stem cap from the top of the valve guide, and then remove the lower spring plate (pic. 7.5, a-e).
Pic. 7.5, a. Compress the valve spring using an appropriate puller...
Pic. 7.5b....then remove the cotters and release the spring puller...
Pic. 7.5, c. Remove the upper spring plate...
Pic. 7.5, g.... and a spring
Pic. 7.5, d. Using pliers, remove the oil cap from the valve stem...
Pic. 7.5, e.... and then remove the lower spring plate
6. If, when the valve spring is compressed with a tool, the spring plate does not want to be released and does not open the crackers, gently tap with a light hammer on the top of the tool, directly above the plate. This will free the plate
7. Remove the valve through the combustion chamber.
8. Be sure to store each valve with its crackers, poppet, spring, and bottom poppet. In addition, the valves should be stored in the correct sequence, unless, of course, they are so badly worn that they need to be replaced. If they are to be stored and reused, place each valve and its components in a labeled plastic bag or similar small container (pic. 7.8). Keep in mind that valve #1 is the valve closest to the edge of the engine where the gearbox is located (flywheel).
Pic. 7.8. Place each valve and related items in a labeled bag