Engine body - Service procedures
2 The height of the cylinder head after surface grinding must not be less than minimun value specified in Workshop Manual, Technical Data for each engine concerned. The flame edge groove does not require machining.
The height of the cylinder head, and distance between the valve disk plane and the cylinder head plane, must not be less than the dimensions given in the specifications. Check also that the valve guides are not worn, since the guiding of the grooving tool is fixed with guide pins through the valve guides.
3 12 ltr engines: New sealing grooves has to be milled in the head as per the following instructions.
Setting of cutting depth of the tool 1 Set up the tool in a vice with the cutting tools facing upwards.
Cylinder head, milling of sealing grooves, 12 ltr engines Special tool: 9531 Before milling new grooves the cylinder head must be surface grinded so that the previous sealing grooves are completely removed.
2 Fit a dial indicator in the holder 2479 and place holder over the shoulder of the ring-shaped grooving tool. 3 Set the dial test indicator to zero to the shoulder.
4 Push the holder with the indicator sideways so that the indicator tip rests on the highest point on one of the cutting tools. Correct cutting depth (tool height): 0.20 mm (0.0079").
1. Nut
5. Spindle
2. Turning handle
6. Milling head
3. Guide plate
7. Steel holder
4. Guide pins
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