Johnson Service Bulletin #542 (1956) - Exhaust Plate #304875

Issued June 1, 1956, this bulletin describes the installation of replacement exhaust plate 304875 on Johnson RD, RDE and RJE-17 through 18C models. The factory provides three illustrations and specifies drilling four 1/4-inch holes to relieve exhaust back pressure during starting.

Johnson Service Bulletin letterhead
SERVICE BULLETIN #542 - MODEL RDJune 1, 1956
INSTALLATION INSTRUCTIONS - PLATE #304875
Johnson factory figures I, II and III showing the original loading tube, replacement plate 304875 and drilling four exhaust stack holes

Since the exhaust loading tube #376786 has been cancelled from the #376699 exhaust stack assembly (RD, RDE & RJE-17 thru 18C) and superseded by plate #304875 shown here, the following instructions for its installation should be closely adhered to - (#376786 will now included #304875 plate and #304876 instruction sheet).

  1. Remove exhaust loading tube #376330 - Figure I.
  2. Install plate #304875 - Figures II & III carefully.
  3. Drill four (4) 1/4" holes into the main body of the exhaust stack - Figure III to relieve back pressure for starting purposes.
Very truly yours,
JOHNSON MOTORS
Arvid Olson
Arvid Olson
Manager - Service Promotion

P.S. (#376786 supersedes #376330).

vn
#304876
Superior Service Spells Satisfaction

Factory parts and installation notes

Exhaust plate 304875 replaces the exhaust loading tube on the specified RD, RDE and RJE models. The factory sheet is numbered 304876. The original bulletin refers to both 376330 and 376786, and its postscript states that 376786 supersedes 376330. Those distinctions are retained as printed.

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