New Holland CX720 Repair Manual page 1797

1 Intake valve seat
Engine F3A — Main data on the intake and exhaust valve seats (Dimensions in mm)
1 Intake valve seat
8. Check the valve seats (2) If you find any slight scor-
ing or burns, rebore them with the tool (1) according
to the angles given in Figs.6 and 7. If you need to
replace them, with the same tool and taking care not
to damage the cylinder head, scalp as muchmaterial
as possible from the valve seats until it is possible,
with a punch, to extract them from the cylinder head.
Heat the cylinder head to 80-100 °C (176-212 °F)
and, using a suitable drift, mount the new valve seats
(chilled in liquid nitrogen) (2) in them. Using the tool
(1) rebore the valve seats according to the angles
given in Figs.6 and 7.
After reboring the valve seats, use tool 296151 and
the dial gauge to check that the position of the valves
in relation to the face of the cylinder head is:
For engine F2B:
-0.5 - -0.8 mm (-0.0197 - -0.0315 in) (cavity) intake
valves;
-1.6 - -1.9 mm (-0.0630 - -0.0748 in) (cavity) exhaust
valves.
-0.65 - -0.95 mm (-0.0256 - -0.0374 in) (cavity) intake
valves;
-1.8 - -2.1 mm (-0.0709 - -0.0827 in) (cavity) exhaust
valves.
POWER PRODUCTION - ENGINE
2 Exhaust valve seat
7
MID0452A
2 Exhaust valve seat
2 4/7/2006
B.10.A / 251
8
MID0453A