Inboard Motors Mercury Mercruiser 1964-1991 service manual, Page 564Get this manual
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APPENDIX
0.025rnrn 0.051 rnm 0.0005"
Paper Desired Thrust Side Relief Side Allowable
Piston Clearance Desired
0.0005" 0.0127mm 0 Xl 1"
0.051rnrn