Flywheel; Crankshaft Drive Gear; Timing Belt; Anode - Mercury 25 EFI Service Manual

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Cylinder Block/Crankcase

IMPORTANT: Do not interchange the main bearing location. If reusing the original bearings, ensure the bearings are

installed in their original locations.

Flywheel

Inspect the flywheel keyway and teeth. Replace if damaged or worn.

Inspect the crankshaft drive gear. Replace if damaged or worn.

Inspect the timing belt. Replace if worn, stretched, or damaged.

Replace the engine water jacket anode if partially consumed.

Measure the cylinder walls for taper, out of round, or excessive ridge at the top of the ring travel. This should be done with a

cylinder bore dial indicator or an inside micrometer. Carefully move the gauge up and down the cylinder bore to determine

taper. Turn the gauge to different points around the cylinder wall to determine the out of round condition.

Main bearings

90-8M0105568 eng MARCH 2016

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