Johnson Service Bulletin SB-718 - Securing the 10 and 18 H.P. Propeller Nut

June 8, 1959. Propeller drive pin and hub damage prevention.

Johnson Motors Service Bulletin letterhead
June 8, 1959
SERVICE BULLETIN NO. SB-718
SUBJECT: SECURING THE 10 and 18 H.P. PROPELLER NUT.
Factory photograph of a propeller showing the drive pin and hub
The stainless steel drive pin used in the 10 and 18 H.P. propeller will wear the inner hub of the propeller, as shown, to the point of complete failure if the propeller nut is not tightened properly.
This type of wear, resulting in propeller failure, can be overcome by securely tightening the propeller nut. Secure the propeller nut in the following manner.
Insert the drive pin in the propeller shaft, and place the propeller in position. Install the propeller nut, and secure as tightly as possible by hand. With a wrench, advance the nut until the cotter pin hole is in alignment. (DO NOT BACK THE NUT OFF TO ALIGN THE COTTER PIN HOLE). The propeller secured in this manner, will not allow the drive pin to float causing hub damage.
JOHNSON MOTORS
Jack Penland
Jack Penland Service Department
JP:eb
NOTE: POST ON YOUR 10 and 18 H.P. INDEX.