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Lower Crankcase - Front View

Fig 1: Identifying Front Lower Crankcase Thread Sizes
GM524547Courtesy of GENERAL MOTORS CORP.
Lower Crankcase - Front View

Service Call Out Thread Size Insert Drill Counterbore Tool Tap Driver Drill Depth (Maximum) Tap Depth (Maximum) Engineering Hole Number
J 42385- MM (IN) MM (IN) -
1 M8 x 1.25 210 206 207 208 209 23.50 0.925 18.5 0.73 138
2 M8 x 1.25 210 206 207 208 209 30.50 1.201 25.5 1.00 139
3 M8 x 1.25 210 206 207 208 209 30.50 1.201 25.5 1.00 140
4 M8 x 1.25 210 206 207 208 209 23.50 0.925 18.5 0.73 141
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