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GEAR BOX
60
REAR COVER SHIM SELECTION PROCEDURES
A. COUNTER SHAFT (SHIM SELECTION)
The control dimension to be maintained between
Counter shaft 3
rd
gear rear face and housing face
rear half is 198 ± 0.1mm.
Calculate the shim value as illustrated below:
•
Let the distance “A” as measured in the step 2
be 200mm
•
Measure the rear cover depth along with the
gasket at counter shaft end. Consider this as “B”,
let this depth be 2.30 mm.
•
Calculate the difference between “A” & “B”. Let it
be “C”.
C= A – B
C= 200 – 2.30
C= 197.7 mm
•
To maintain the control dimension of 198± 0.1
mm the shim thickness is calculated as below:
Thickness of shim to be inserted = 198 – C
= 198 – 197.7
= 0.3 mm
B. MAIN SHAFT SHIM SELECTION
The control dimension to be maintained between
Main shaft 2
nd
gear Shoulder face front and housing
face rear half is 197 ± 0.1 mm.
Calculate the shim value as illustrated below
•
Let the distance “E” as measured in the step 3
be 202mm
•
Measure the rear cover depth along with the
gasket at main shaft end. Consider this as “F”,
let this depth be5.50 mm.
•
Calculate the difference between “E” & “F”. Let it
be “G”.
G= E – F
G= 202 – 5.50
G= 196.5 mm
•
To maintain the control dimension of 197±
0.1mm the shim thickness is calculated as be-
low:
Thickness of shim to be inserted = 197 – G
= 197 – 196.5
= 0.50 mm