A
B
C
D
E
F
G
H
L
M
N
P
section
N 6.3
138 1098/1098S - M.Y. 2007 - edition 00
Engine
If fitting a new primary drive gear pair (3), check the backlash.
Temporarily fit the gear (C) complete with the bearings and the oil seal onto the gearbox input shaft and fix a dial gauge on the
crankcase; position the dial gauge stylus on a gear tooth.
Turn the driven gear (D) to mesh the teeth and check with the dial tool that backlash ranges between 0.05 and 0.07 mm.
Measure the backlash at 16 diametrically opposed points of the gear.
If the measured values are outside the permissible tolerance, change the position of the driven gear (C) on the input shaft leaving
crankcase gear (D) untouched. If still outside tolerance values, renew the primary drive gear pair.
When this test is complete, finally tighten the previously installed nut (11).
Fit the service tool no. 88713.2102 to the gear (D) and immobilise it by inserting a pin in one of the holes mounting the engine
block to the frame.
Tighten the nut to the specified torque with a torque wrench (Sect. C 3), working clockwise.
Stake the washer (10) on the gear (D) in correspondence with the milled location and on the nut (11) in a diagonally opposed
position.
3
C
D
88713.2102
D
11
10
D
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