New Holland 40 Series Repair Manual page 33

- - - - - - - - - - - - - C H A P T E R 1 - - - - - - - - - - - - -
Rocker Shaft Assembly
1. Bohs
2. Rocker Arm
3. Spacer
4. Spring
5. Rocker Arm Shaft
Support
6. Groove at Front of
Shaft
3. Assemble rocker shaft support with long
head bolts, ensuring springs and spacers
are re-assembled as in, Figure 19.
ROCKER SHAFT INSTALLATION
0
.
)
20
R1-17
f.G
Rocker Shaft Assembly
1. Rocker Arm Adjusting Screw
2. Push Rod
1. Inspect rocker arm adjusting screws, and
push rod ends of the rocker arm, includ-
ing the ball end of the screws for nicks,
damage, or excessive wear, Figure 20.
2. Also inspect the inside diameter of the
rocker arm for damage or wear. If any of
these characteristics are not to specifica-
tion replace with new parts.
3. Check the ends of the push rods for dam-
age or wear. If not to specification or push
rods were found not to be straight during
dismantling install new rods.
15
NOTE: Do not attempt to straighten bent
push rods, replace with new.
CYLINDER HEAD RE-ASSEMBLY
1. Insert the valves into the guide bores from
which they were removed and lap with a
suitable paste, ensure all traces of paste
are removed after lapping.
2. Lubricate all components with clean en-
gine oil on re-assembly. Use a spring
compressor to reassemble the valves,
valve springs, retainers, rotators, and col-
lets, and install new umbrella seals.
3. Coat all components with clean engine oil
prior to assembly, and insert each push
rod into its original position, ensuring
each ball end is seated in its cam follower,
Figure 20.
CYLINDER HEAD INSTALLATION
Installation of the cylinder head assembly
and components is the reverse of the removal
procedure, observing the following,
21
Cylinder Head Bolt Tightening Sequence
1. Install new cylinder head, intake and ex-
haust manifold gaskets, Figure 21.
NOTE: Ensure exhaust manifold gasket is fit-
ted correctly to suit profile of exhaust ports.
2. Tighten the cylinder head bolts in se-
quence progressively in three stages,
Figure 21.
Stage1, 115 lbf ft (156N m) 15.6 kgf m
Stage2, 140 lbf ft (190N m) 19.3 kgf m
Stage3, 160 lbf ft (217N m) 22.0 kgf m
NOTE: Bolts to be lubricated prior to assem-
bly, and should be tightened to torque specifi-
cation, with the engine cold.