1998+ Mercury Mariner 25HP Bigfoot Service Manual, Page 245Get this manual

CYLINDER BLOCKCRANKCASE
Crankshaft

Crankshaft Run-out

Checking Main Bearing Clearance
IMPORTANT: Do not interchange the main bearingsReinstall in their original position

• ATV
• Jet Ski
• Outboard Motors
• Personal Watercraft
• Snowmobiles
• Stern Drives