2007-2009 Yamaha F15/F20 Outboard Service Manual, Page 165Get this manual

Propeller shaft housing
S6AG6190

NOTE: Be sure to select the reverse gear shim(s) if replacing the propeller shaft housing, ball bearing, or lower caseTo select the shims, see "Shimming" (6-20) After installing the reverse gear and shim(s), check that the reverse gear rotates smoothly

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• Stern Drives