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SUBJECT: 307708 LOCKWASHER REPLACES 307161 LOCKWASHER - 75 H.P. SERIES GEARCASE ASSEMBLY
Beginning with December production of the 75 H.P. series engine, the old external tooth lockwasher part number 307161 (Figure #1) is no longer used on the studs which secure the upper and lower gearcase housing together.
In place of the 307161 external tooth lockwasher we are using a split or spring type lockwasher part number 307708 (Figure #1). This change was made in production to assist in holding the specified torque of 18 Ft. lbs. on the securing stud nuts. (Figure #2)
It is suggested that the new spring type lockwasher be installed whenever the gearcase is removed for any reason, or if there is evidence that the securing stud nuts are loose. The new lockwasher part number 307708 is of special stainless steel to resist corrosion in salt water areas. (Do not use substitutes). The lockwashers are available from your PARTS DISTRIBUTOR. (Two lockwashers required per gearcase - Torque nuts 18 Ft. lbs.).
JOHNSON MOTORS
Jack Penland
Service Department
JP:eb
NOTE: POST ON YOUR V4 SERIES INDEX