Mercury BRAVO Service Manual page 302

BRAVO THREE GEAR HOUSING
Example:
Total Gear/Spline Backlash
(Reading - Step 8d Above):
Minus
Spline Lash (From Propeller
Shaft Spline Lash Check
on page 3D-22):
Equals
Actual Gear Backlash:
9. Rear driven gear shimming.
Page 3D-40
g. If backlash is not correct, disassemble and proceed as follows:
If backlash is more than specified, add shims behind front driven gear bearing cup.
If backlash is less than specified, remove shims behind front driven gear bearing
cup.
h. Recheck backlash reading after reassembly.
a. Position gear housing so that propeller shafts are facing down in the vertical position.
Loosen locking bolt on drive shaft retaining tool and rotate propeller shafts several
times to seat bearings prior to making checks. Lightly press down on drive shaft re-
taining tool to ensure bearings are seated in bearing cups, then tighten locking bolt
to retain drive shaft.
b. Install backlash indicator rod to outer propeller shaft as shown. Mount dial indicator
to bearing carrier and position probe on mark stamped in indicator rod.
a - Backlash Indicator Rod
b - Outer Propeller Shaft
c - Dial Indicator
c. Check gear/spline lash by lightly rotating outer propeller shaft back and forth. Ob-
serve dial indicator and record reading.
d. From the Gear/Spline Lash reading checked earlier, subtract reading obtained from
Propeller Shaft Spline Lash Check. Actual gear backlash should be between
.012-.016 in. (0.3-0.4 mm).
.030 In. (0.75 mm)
.016 In. (0.4 mm)
.014 In. (0.35 mm)
c
a
SERVICE MANUAL NUMBER 28
b
90-863160 MAY 2000
75907