New Holland CX720 Repair Manual page 1795

Cylinder head - Overhaul (B.10.A.72 - F.10.A.40)
CX860, CX880
Handle all parts carefully. Do not put your hands or fingers between parts. Always wear suitable safety items
such as fitted clothing, safety goggles, gloves, shoes, etc. M954
1. Checking the hydraulic seal
Before removing the cylinder head, check the hy-
draulic seal with appropriate equipment: replace the
cylinder head if there is any leakage.
2. Removing the valves
With the bracket (4) secure the tool (2):
- 296175, for the F2B engine;
- 296173-296174, for the F3A engine to the cylinder
head.
Screw down with the lever (1) until it is possible to
remove the cotters (3). Remove the tool (2) and ex-
tract the top plate (5) spring (6) and bottom plate (7)
Repeat this process for all the valves. Turn the cylin-
der head over and extract the valves (8).
3. Checking head mating surface on cylinder assembly
Check the mating surface (1) of the head on the cylin-
der assembly with a rule (2) and a feeler gauge (3) If
you find any deformation greater than 0.2 mm (0.008
in), replace the cylinder head.
NOTE: After this process you need to check the valve cav-
ity and injector protrusion.
4. Valves
Decarbonizing and checking the valves
Decarbonize the valves using the specific metal
brush.
Check that the valves show no signs of seizure or
cracking and, in addition, check with a micrometer
that the diameter of the valve stem comes within the
required values (see Figs.:4- 5); if it does not, replace
the valves.
POWER PRODUCTION - ENGINE
CAUTION
2 4/7/2006
B.10.A / 249
1
MID0446A
2
MID0447A
3
MID0448A