Mercury Mariner 25HP 4-Stroke Outboard Service Manual 1997, Page 159Get this manual

Mercury Mariner 25HP 4-Stroke Outboard Service Manual 1997, Page 159

Piston Pin 1Measure piston pin diameterReplace piston pin if out of specification
Piston Rings
PISTON RING SIDE CLEARANCE 1Measure piston ring side clearanceReplace piston and or piston rings if out of specification

Piston Pin Diameter
0.62850.6287 in(15.96515.970 mm) 1Place the piston pin into the connecting rod and check for free playThere should be no noticeable free play

Piston Ring Side Clearance
Top Middle 0.00080.0024 in(0.020.06 mm) 0.0010.003 in(0.030.08 mm)

PISTON RING END GAP CLEARANCE

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