New Holland 40 Series Repair Manual page 35

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5. Withdraw the retaining bolts, and remove
the front cover and gasket, Figure 24.
Timing Gears
1. Camshaft Gear 4. Injection Pump Drive
2. Crankshaft Gear Gear
3. Camshaft Idler Gear
NOTE: The crankshaft timing gear No. 2,
Figure 25, should not be removed. The gear
is heat shrunk on to the crankshaft and
aligned to the crankshaft No. 1 pin to
0.004 in (0.10mm).
If
the gear is damaged a
new crankshaft is required.
6. Before removing the timing gears,
Figure 25, use a dial indicator or feeler
gauge, Figure 26, to measure the back-
lash between each set of gears.
Timing Gear Backlash
1. Feeler Gauge
7. Rotate the gears and check the backlash
using a feeler gauge or dial indicator at
four equal points on the gears. Renew if
the backlash exceeds the following,
Figure 26:-
Backlash to crankshaft gear:
0.006--0.018 in (0.15--0.46mm)
17
Backlash to camshaft gear:
0.006-0.018 in (0.15-0.46mm)
Backlash to fuel injection pump gear:
0.004-0.021 in (0.10-0.53mm)
CAMSHAFT DRIVE GEAR
Camshaft End Play Measurement
1. Lever 3. Camshaft Gear
2. Feeler Gauge 4. Thrust Plate
1. Pry the camshaft gear using a lever away
from thrust plate. Using a dial indicator or
feeler gauge, check the clearance to
0.002-0.007 in (0.076--0.35mm). If out-
side of limits fit a new camshaft thrust
plate, Figure 27.
2. Remove the camshaft idler gear retaining
bolt, gear and adaptor from the block,
then remove the camshaft gear bolt and
disassemble.
3. Remove retaining nut and washer from
the fuel pump and remove the gear from
the shaft using a puller. For more informa-
tion refer to "FUEL SYSTEMS" Part 2.
Inspection and repair of gears
1 . Wash the gears using a suitable solvent
and examine gear teeth for wear, burrs or
scratches. Minor marks can be removed
using a fine abrasive, thoroughly clean
before re-assembly.
2. Ensure the camshaft idler gear adaptor is
free from obstruction and bushing is not
damaged. Camshaft key and key-way
should be checked for damage and re-
paired as required.