MIDDLE GEAR
5-115
IP
Select the middle driven pinion gear shim(s) “2”
by calculating the middle drive pinion gear shim
thickness and then measuring the middle gear
backlash.
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a. Position the middle gears with the appropri-
ate shim(s) that has had its respective thick-
ness calculated from information marked on
the upper crankcase, middle driven pinion
gear, and bearing housings.
b. To find middle drive pinion gear shim thick-
ness “A”, use the following formula.
“a”= a numeral on the middle drive pinion
gear bearing housing, to be divided by 100
and added to “14.50”
“b”= 57.70
“c”= a numeral on the upper crankcase, to be
divided by 100 and added to “71.00”
Example:
If the middle drive pinion gear bearing hous-
ing is marked “7”
“a” is 14.57 (i.e., 14.50 + 0.07 = 14.57)
“b” is 57.70
If the upper crankcase is marked “68”
“c” is 71.68 (i.e., 71.00 + 0.68 = 71.68)
“A” = 14.57 + 57.70 - 71.68 = 0.59
Round off to the hundredths digit and select
the appropriate shim(s).
IP
In the above example, the calculated number is
0.59. The chart instructs you to round off the 9 to
10. Thus, the shim thickness is 0.60 mm.
Shims are supplied in the following thickness-
es.
c. To find middle driven pinion gear shim thick-
ness “B”, use the following formula.
“d”= a numeral on the middle driven pinion
gear bearing housing, to be divided by 100
and either added to or subtracted from
“54.55”
A. Middle drive pinion gear shim thickness
B. Middle driven pinion gear shim thickness
Middle drive pinion gear shim thickness
“A” = “a” + “b” - “c”
1
2
B
f
e
d
A
c
ba
g
a
Hundredths Rounded value
0, 1, 2 0
3, 4, 5, 6, 7 5
8, 9 10
Middle drive pinion gear shim
Thickness (mm)
0.10 0.15 0.20 0.30 0.40 0.50
Middle driven pinion gear shim thickness
“B” = “d” - “e” + “f” - “g”
c
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