LEFT HAND NON-RATCHETING
90-884294 OCTOBER 2001 Page 6B-71
2. Install a dial indicator and align the dial indicator pointer so that it is perpendicular to
and touching the “I” mark on the dial indicator tool. Tighten the indicator tool onto the
drive shaft and rotate the drive shaft so that the needle in the dial makes at least one
full revolution and comes to “0” on the dial indicator scale.
57939
a
b
c
d
a
e
f
a-Nuts (4) (Obtain Locally)
b-Threaded Rod [3/8 in. (9.5mm) obtain locally]
c-Dial Indicator Holding Tool (91-83155)
d-Dial Indicator (91-58222A1)
e-Indicator Pointer
f-Backlash Indicator Rod (91-53459) (for 1.75:1 ratio)
Backlash Indicator Rod (91-78473) (for 1.87:1 ratio)
3. Take the backlash readings by lightly turning the drive shaft back and forth, so as to
feel the backlash between the gears, (no movement should be noticed at the propeller
shaft).
a. Observe the dial indicator and record the reading.
b. Loosen the indicator tool and rotate the drive shaft 90 degrees in a clockwise di-
rection.
c. Repeat step 2 above and take and record another reading. Repeat step 3 until a
total of 4 backlash readings have been taken.
4. Add the four readings together and divide the sum by four. This is your average back-
lash and it should be 0.040 in. - 0.060 in. (1.0 mm - 1.5 mm) (for 1.75:1 and 1.87:1
ratios).
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