1963-1973 Mercruiser all Engines and Drives Service Manual Books 1 and 2, Page 564Get this manual
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lOn 60-80 and 90 modelsremoe im lIer sh aft leh han thre ad!( Fi gur 1) On -thru -160 lsrcmo 'C nutri"'ht hand thread)lI ashertaper ed ll er barinf?;spacer and gear can be lifted fr om upper drive sha