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"A"
1
a
MIDDLE GEAR
M
MMM
a. Position middle drive and driven gear by
using shims 1 and 2 with their respective
thickness
marked on crankcase, bearing housing and
drive gear end.
1 Shim thickness "A"
2 Shim thickness "B"
b. To find shim thickness "A", use following for-
mula:
Middle drive pinion gear shim thickness
"A" = e + d + a – c – b – k
2
Where:
a = a numeral (usually a decimal number) on
"B"
the bearing housing is either added to or
subtracted from "0.9"
b = 17.0
c = 55.0
d = a numeral (usually a decimal number) on
the left crankcase specifies a thickness of
"65.0"
e = a numeral (usually a decimal number) on
the right crankcase specifies a thickness
of "9.0"
k = 1.5
Example:
1) If the bearing housing is marked "+01",
..... a is 0.91
2) b is 17.0
3) c is 55.0
4) If the left crankcase is marked "64.96",
..... d is 64.96
5) If the right crankcase is marked "9.01",
..... e is 9.01
d
6) k is 1.5
7) Therefore, the shim thickness is 1.38 mm.
"A" = 9.01 + 64.96 + 0.91 – 55.0 – 17.0 – 1.5
e
4 - 99
ENG
M MMM
M
M MMM
M
M MMM
M
M MMM
calculated
from
= 1.38
M
M MMM
M
MMM
information
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