Johnson Service Bulletin SB-979 - Special Screwdriver 379664

Issued September 3, 1963, this factory bulletin introduces a specialized screwdriver for fixed high-speed carburetor jets. The tool was sold directly through the OMC Parts Depot in Galesburg, Illinois.

Johnson Motors service bulletin letterheadFactory photograph of screwdriver part 379664 and enlarged tip detail
September 3, 1963
SB-#979 Special Tools
SUBJECT: Part No. 379664 SCREWDRIVER
For use when removing or installing fixed high speed carburetor jets.
The subject service tool has been designed to remove and install fixed high speed jets in Johnson Outboard carburetors - without danger of damaging threads in the carb- uretor casting.
Always first remove the jet well screw plug with a heavier screwdriver, since the tip of this tool is not strong enough to unseat or retighten the screw plug.
Part No. 379664 SCREWDRIVER is available only through Outboard Marine Corporation Parts Depot in Galesburg, Illinois at $1.00 net. Do not order this item from your Parts Distributor nor from the factory service department.
Use the enclosed order form when ordering and be sure to remit the full prepayment. No C.O.D. orders will be accepted.
Sincerely,
JOHNSON MOTORS
Robert Compton Administrative Assistant
Part No. 379664 Screwdriver
NOTE: Post on your Miscellaneous Index.

Historical parts reference

379664 - Special screwdriver for fixed high-speed carburetor jets. The bulletin specifies a historical net price of $1.00 and warns that the tool tip is not strong enough to loosen or retighten the jet well screw plug.