SELVA MARINE Manta 40 Service Manual page 326

LOWR
1
SHIMMING
2
Selecting steps
(1) Measure (M2).
S S S S h h h h i i i i mm
Digital caliper ................................
M2
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).
(2) Calculate the reverse gear shim thick-
ness (T2).
Reverse gear shim thickness (T2) =
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, assum a
"R" value of "0", and check the backlash
when the unit is assembled.
• If the "R" mark is negative (-), then sub-
tract the "R" value from the measure-
ment.
Example:
If M2 is "96.79 mm" and "R" is "+5", then:
T2 = 98 mm + (+5)/100 - 96.79 mm
= 98 mm + 0.05 mm - 96.79 mm
= 1.26 mm (0.050 in)
If M2 is "96.79 mm" and "R" is "-3", then:
T2 = 98 mm + (-3)/100 - 96.79 mm
= 98 mm - 0.03 mm - 96.79 mm
= 1.18 mm (0.047 in)
6-32
mmi i i i n n n n g g g g p p p p l l l l a a a a t t t t e e e e ... ... ... .... . . . ............... ................ . . . ........
mm mm ............... ...............
90890-06701
90890-06704
98 mm + R/100 - M2
E
1
........
........ ........
2