Mercury Mariner 25HP 4-Stroke Outboard Service Manual 1997, Page 9Get this manual
Ring End Gap (Installed) Top Middle Bottom (Oil Ring) Side Clearance: Top Middle Bore Wear Limit
0.0060.0 12 in(0 .150.03 mm) 0.0120.020 in(0.30.50 mm) 0.0080.028 in(0.20.70 mm) .00080.0024 in(0.020.06 mm) 0.00080.0024 in(0.020.06 mm) 3.735 in(94.883 mm) 3.802 in(95.045 mm) 9.8:1 180 -210 psi (Peak) 0.62850.6287 in(15.96515.970 mm) 0.00080.0020 in(0.0200.052 mm) 0.62930.6298 in(15.98515.998 mm) 0.00050.0017 in(0.0120.044 mm) 0.0012 in(0.03 mm)
BALANCE PISTON Wear Lim it CRANKCASE COVER COMPRESSION RATIO PISTON PIN CONNECTING ROD CRANKSHAFT
Compression Ratio Cylinder Compression (cold engine Wo O_To) Piston Pin Diameter
011 Clearance (Big End) Small End Inside Diameter
Main Bearing Clearance Crankshaft Run-out Camshaft Dimensions IntakeA" ExhaustA" IntakeB" ExhaustB"