3-41
3
MT008B
NOTE: Do not use a new lock nut at this time as
this procedure may have to be repeated.
5. Place the assembled shaft into the left crankshaft
case; then lightly coat the gear teeth with machinist's
lay-out dye. Rotate the shafts through several rota-
tions in both directions. Gear contact should extend
from the root to the top of the gear teeth.
MT016A
6. To adjust tooth contact, use the following chart to
correctly shim the driven shaft.
7. After correct tooth contact is established, proceed to
Checking Backlash in this sub-section.
Checking Backlash
1. If removed, install the secondary drive/bevel gear
shaft into the crankcase; then tighten the nut to 59
ft-lb.
2. Install the secondary drive bearing support; then
install the secondary driven output shaft into the
crankcase.
3. Mount the dial indicator so the tip is contacting a
tooth on the secondary drive bevel gear.
4. While rocking the drive bevel gear back and forth,
note the maximum backlash reading on the gauge.
MT005A
5. Acceptable backlash range is 0.115-0.390 mm
(0.005-0.015 in.).
Correcting Backlash
NOTE: If backlash measurement is within the
acceptable range, no correction is necessary.
1. If backlash measurement is less than specified,
remove an existing shim, measure it, and install a
new thinner shim.
2. If backlash measurement is more than specified,
remove an existing shim, measure it, and install a
thicker shim.
NOTE: Continue to remove, measure, and install
until backlash measurement is within tolerance.
Note the following chart.
After backlash and tooth contact are within specifica-
tions, apply red Loctite #271 to the driveshaft threads and
driven output shaft threads; then using new nuts, tighten
the output shaft nut to 59 ft-lb and the output yoke nut to
74 ft-lb.
CRANKSHAFT ASSEMBLY
NOTE: The crankshaft and connecting rod is a
non-serviceable assembly. If any component is
out of specification, the assembly must be
replaced.
Measuring Connecting Rod
(Small End Inside Diameter)
1. Insert a snap gauge into the upper connecting rod
small end bore; then remove the gauge and measure
it with micrometer.
Tooth Contact
Shim Correction
Contact at Top
Increase Shim Thickness
Contact at Root
Decrease Shim Thickness
Backlash Measurement
Shim Correction
Under 0.115 mm (0.005 in.)
Decrease Shim
Thickness
At 0.115-0.390 mm (0.005-0.015 in.)
No Correction Required
Over 0.390 mm (0.015 in.)
Increase Shim Thickness
Manual
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