New Holland TV145 Repair Manual page 60

Valve Springs
1. Checked on a flat surface squareness, should
not exceed 0.060 in (1.52mm), between the
square, and spring at the top edge, Figure 44.
Length of valve springs should be checked on
both free length, and loaded length.
Free length = 2.39 in (60.7mm)
Installed length =1.86–1.95 in (47–49.6mm)
Loaded length = 1.9 in (48.26mm) using a
weight of 61.96 lb (28–31 kg)
Loaded length = 1.4 in (35.69mm) using a
weight of 135–153 lb (61–69 kg)
Ensure the valve spring retainer locks are in good
condition, and replace if worn or damaged.
Rocker Shaft Inspection and Reassembly
1. Separate rocker shaft assembly by removing the
cylinder head bolts (3) and withdraw the supports
(2), springs (1), rockers (4) and spacers (6).
2. Clean all components using approved cleaning
solution and make sure all oil passages are clear.
3. Inspect rocker arm adjusting screws, and push
rod ends of the rocker arm, including the ball end
of the screws for nicks, damage, or excessive
wear.
4. Inspect the inside diameter of the rocker arm for
damage or wear. If any of these characteristics
are not to specification replace with new parts.
5. Check the ends of the push rods for damage or
wear. If not to specification or push rods were
found not to be straight during dismantling install
new rods.
Do not attempt to straighten bent push rods, replace
with new.
6. Check the rocker shaft for signs of wear or
damage on internal and external diameters
respectively.
7. Re–assemble the rocker shaft components onto
the shaft ensuring the shaft identification groove
(1), is positioned forwards and upwards. This
ensures oil grooves and holes face downwards.
SECTION 10 – ENGINE – CHAPTER 1
10-35
1
6
TA6010010
2 3
5 4
44
45
46