Mercury Mariner 25HP 4-Stroke Outboard Service Manual 1997, Page 9Get this manual
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Ring End Gap (Installed) Top Middle Bottom (Oil Ring) Side Clearance: Top Middle Bore Wear Limit
_B _ Run-out Limit Camshaft Bearing Diameterb" CAMSHAFT
0.0039 in(0.1 mm) 1.45411.45