Mercury Mariner 4 and 5HP 4-Stroke Outboards Service Shop Manual 1999, Page 158Get this manual
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CVLlNDER BLOCK AND CRANKCASE
4 Stroke Outboard Oil (92828000A 12)
aPiston Ring Compressor (FT2997)
bPosition Mark 3H6 Towards Oil PanDirection Arrow (Must Face The Cams