1983 Yamaha 30EN Outboards Service Manual, Page 9Get this manual
For lower unit service
1Driver rodPINYB-6071 Attachment PINYB-6081 Plate PINYB-6169
2Wrench PINYB-6078 Torquing tool PINYB-6079
These tools are used when loosening and tightening the pinion gear nutYB-6081