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SECTION 6 - GENERAL MECHANICAL OVERHAUL
CURSOR SERIES
Base - 03/2015 Print P4D32C006 E
Regrinding - replacing the valve seats
NOTE The valve seats are reground whenever the valves or the valve guides are ground and replaced.
Figure 115
181831
1 Intake valve seat 2 Exhaust valve seat
When replacing/checking the valve seats, refer to the main data provided in the figure.
Figure 116
41032
Check the valve seats (2). If there are light scorings or burnings,
regrind them with a suitable tool (1) according to angles
shown in the previous figure.
If they need to be replaced, using the same tool and taking care
not to accidentally damage the cylinder head, remove as much
material as possible from the valve seats until it is possible to
extract them from the cylinder head using a punch .
Heat the cylinder head to 80 - 100 ºC and, using a drift, fit in
the new valve seats (2), chilled beforehand in liquid nitrogen.
Using the tool (1), regrind the valve seats according to the
angles shown in the previous figure .
After regrinding the valve seats and using a dial gauge (0-5mm)
99395603 with base 99370415, check that the position of the
valves in relation to the cylinder head surface respects the
values shown below:
Technical data
Intake valves recessing -0.54 - -0.86 mm
Exhaust valves recessing -1.47÷-1.79mm
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