Selecting The Reverse Gear Shims - Yamaha 200A Service Manual

2. Calculate the lower case standard(F/100).
NOTE:
• "F" A stamped on the trim tab mounting face
refers to the deviation of the lower case di-
mension from the standard. The numeral is
in 1/100 mm.
• If the numeral is unknown, assume that "F"
is zero, and check the backlash when the unit
is assembled. Readjustment shall be made
if the backlash is out of specification.
3. Calculate the forward gear shim thickness.
Calculation formula:
Forward gear shim thickness
(T1) = 28.60 + F/100 - M1
Example:
If "M1" = 28.00, and "F" = –5, then :
T1 = 28.60 + (–5/100) – 28.00
= 28.60 – 0.05 – 28.00
= 0.55
4. Select the forward gear shim(s) as follows.
Calculated numeral
at 1/100 place
1,2
3,4,5
6,7,8
9,10
Available shim thickness:
0.10, 0.12, 0.15, 0.18, 0.30, 0.40, 0.50
Example:
If "T1" is 0.55 mm, then the forward gear
shim is 0.52 mm.
If "T1" is 0.60 mm, then the forward gear
shim is 0.58 mm.
60H5E11
S69J6570
Rounded numeral
0
2
5
8
Shimming (regular rotation model)

Selecting the reverse gear shims

NOTE:
Obtain the reverse gear shim thickness (T2)
by using the specified measurement(s) and the
calculation formula.
Calculation formula:
Reverse gear shim thickness
(T2) = M2 - 29.00 - R/100
1. Measure the reverse gear shim height (M2)
from the thrust washer on the propeller
shaft housing.
NOTE:
Take measurements at three points on the re-
verse gear, and obtain the average.
Shimming plate 1: 90890-06701
Digital caliper 2: 90890-06704
T2
60h60648
6
60h60650
6-30