Mercury Mariner 25HP 4-Stroke Outboard Service Manual 1997, Page 158Get this manual

Mercury Mariner 25HP 4-Stroke Outboard Service Manual 1997, Page 158

Balance Piston 1Measure the balance piston diameterReplace

MEASURING PISTON

piston if worn below 3.735 in(94.883 mm)
1Measure the piston at poi nt 0.2 in (5 .0 mm) from the bottom
aPiston Diameter
Balance Piston Wear Limit

3.735 in(94.883)

Crankcase Cover Bore
1Measure the bore diameterReplace cylinder block if worn over 3.802 in(95.045 mm)
aPiston Diameter
b0.2 in(5.0 mm)

Piston Diameter "a"

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