Factory service publications / 1950s / Service Bulletin 543

Johnson Service Bulletin #543 (1956) - Exhaust Plate #304880 Installation

Issued June 1, 1956, for Johnson QD models. The factory describes replacing the canceled exhaust loading tube #376289 with plate #304880 on the #376406 exhaust stack assembly, including removing baffle #304002 and drilling four 5/32-inch holes to relieve starting back pressure. The original bulletin includes three installation illustrations.

SERVICE BULLETIN #543 - MODEL QDJune 1, 1956
INSTALLATION INSTRUCTIONS - PLATE #304880
Factory figures I, II and III showing removal of exhaust baffle and installation of plate 304880
III

Since the exhaust loading tube #376289 has been cancelled from the #376406 exhaust stack assembly (QD-16 thru 17R & FD, FDE-10) and superseded by plate #304880 shown here, the following instructions for its installation should be closely adhered to - (#376289 will now include #304880 plate and #304882 instruction sheet).

  1. Remove loading tube assembly #376289 - Figure I.
  2. Remove baffle #304002 - Figure I.
  3. Install plate #304880 - Figures II & III.
  4. Carefully drill four (4) 5/32" holes into the main body of the exhaust stack to relieve back pressure for starting purposes.
Original signed Johnson Motors closing, Arvid Olson, Manager - Service Promotion

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#304882
Superior Service Spells Satisfaction

Factory part numbers

#376289 exhaust loading tube assembly; #376406 exhaust stack assembly; #304880 replacement plate; #304002 baffle; #304882 instruction sheet. Models: QD-16 through QD-17R, FD and FDE-10.