Factory service publications / 1950s / Service Bulletin 564

Johnson Service Bulletin #564 (1956) - Exhaust Baffle Plate Removal

Issued November 15, 1956, this bulletin describes when to remove the exhaust baffle plate during service of modified 25 H.P. and 30 H.P. Johnson outboards, identifies replacement gasket #304545, and notes the 1957 RD-19 series construction.

Johnson Service Bulletin red letterhead and distribution checklist
SERVICE BULLETIN #564November 15, 1956
EXHAUST BAFFLE PLATE REMOVAL - MODEL RD'S

Because of engineering study and further experience with the water problem, it has been determined that the exhaust baffle plate can be removed.

When service is required on modified 25 H.P. motors or any of the 30 H.P. motors, where powerhead removal is necessary, remove the baffle plate and gaskets - carefully clean powerhead and exhaust tube gasket surfaces. Install one #304545 gasket, reassemble powerhead and exhaust tube.

It is not necessary to remove the baffle plate unless the powerhead is being detached from the lower unit for other reasons.

Model RD-19 series (1957) 35 H.P. is not provided with the stainless steel baffle plate.

Very truly yours,
JOHNSON MOTORS
Arvid Olson
Arvid Olson
Manager - Service Promotion
vn
Superior Service Spells Satisfaction

Original factory reference

Johnson Service Bulletin #564, November 15, 1956. Gasket part number 304545. The signature is represented using a handwriting font for presentation, not a facsimile of Arvid Olson's actual signature. Consult the original scan for the historical signature and page appearance.