Mercury Mariner 30/40 4-Stroke Outboard Service Manual 1998, Page 247Get this manual

Mercury Mariner 30/40 4-Stroke Outboard Service Manual 1998, Page 247

CYLINDER BLOC KCRANKCASE
9Remove the bolts and crankcase 10Measure the compressed plastigauge to check the main bearing clearanceReplace bearings if clearance is not within specification
aCompressed Plastigauge Main Bearing Clearance 0.00050.0017 in(0.0120.044 mm)

SELECTING NEW MAIN BEARINGS
1Locate the main bearing code letters on the cylinder block

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