Yamaha F115A Service Manual page 460

LOWR
6B30
SHIMMING (COUNTER ROTATION MODELS)
(FOR WORLDWIDE)
6890
6B40
SELECTING THE REVERSE GEAR
SHIMS
NOTE:
Select the shim thickness (T1) by using the
specified measurement(s) and the calcula-
tion formula.
Select:
• Shim thickness (T1)
Selecting steps
(1) Measure (M1).
Digital caliper
90890-06704
NOTE:
• Measure the combined thickness of the
roller bearing 1 and thrust bearing 2.
• Turn the roller bearing outer race two or
three times so the rollers seat. Then, mea-
sure the height of the bearing, as shown.
• Perform the same measurement at three
points on the roller bearing outer race.
• Find the average of the measurements
(M1).
(2) Calculate the reverse gear shim thick-
ness (T1).
Reverse gear shim thickness (T1)
(T1) = 25.3 + F/100 – M1
NOTE:
"F" is the deviation of the lower case
dimension from standard. It is stamped on
the trim tab mounting surface of the lower
case in 0.01-mm units. If the "F" mark is
missing or unreadable, assume an "F"
value of "0", and check the backlash when
the unit is assembled.
6-80
E
6