Selecting The Reverse Gear Shims - Yamaha 25BMH Service Manual

LOWR
SHIMMING
SELECTING THE REVERSE GEAR
SHIMS
NOTE:
Select the shim thickness (T2) the specified
measurement(s) and the calculation for-
mula.
Select:
• Shim thickness (T2)
Selecting steps
(1) Measure (M2).
Shimming plate ............................
90890-06701
Digital caliper ................................
90890-06704
NOTE:
• Measure the height of the gear as
shown.
• Perform the same measurement at
three points on the gear.
• Find the average of the measurements
(M2).
• When using the digital caliper, be sure
to place it at right angles to the shim-
ming plate.
Otherwise, measurement will be incor-
rect.
(2) Calculate the reverse gear shim thick-
ness (T2).
Reverse gear shim thickness (T2) =
80 mm + R/100 - M2
NOTE:
• "R" is the deviation of the lower case
dimension from standard. It is stamped
on the anode mounting surface of the
lower case in 0.01 mm units. If the "R"
mark is missing or unreadable, assume
a "R" value of "0", and check the back-
lash when the unit is assembled.
• If the "R" mark is negative (-), then sub-
tract the "R" value from the measure-
ment.
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