GEAR BOX 58 REAR COVER SHIM SELECTION PROCEDURES A. COUNTER SHAFT (SHIM SELECTION) The control dimension to be maintained between Counter shaft 3rd 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 2nd 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 below: Thickness of shim to be inserted = 197 – G = 197 – 196.5 = 0.50 mm
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