SECTION 6 - GENERAL MECHANICAL OVERHAUL
51
CURSOR SERIES
Print P4D32C006 E Base - 03/2015
Checking the planarity of the head on the
cylinder block
Figure 112
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Check the supporting surface (1) of the head on the cylinder
assembly with a rule (2) and a feeler gauge (3).
If you find any deformation, level the head on a surface grinder;
maximum amount of material that can be removed 0.2 mm.
NOTE After this operation, check valve recessing and
injector protrusion.
Valve descale and check
Figure 113
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Remove all carbon deposits from the valves using a wire brush.
Figure 114
A B
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* = Value to be obtained after driving in the valve guides
A = intake - B = exhaust
Check that the valves show no signs of seizure or cracking and also check with a micrometer that the valve stem diameter is within
the required values: replace the valves if it is not.
Regrind the valve seats, if required,usingagrindingmachineandremovingaslessmaterialaspossible.
Use a bore gauge to check that the diameter inside the valve guide corresponds to the value indicated, after fitting.
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