Johnson Service Bulletin #514 (1955) - RD Exhaust Manifold Gaskets

Issued November 8, 1955, this important factory bulletin changes the exhaust manifold gasket installation procedure for Johnson RD models. Gasket 302608 was cancelled because it could be confused with 302607, allowing water into the exhaust chamber and powerhead. The factory directs mechanics to install two 302607 gaskets instead of one of each.

Johnson Service Bulletin letterhead
SERVICE BULLETIN #514 - MODEL RDNovember 8, 1955
Gaskets #302607 and 302608 Model RD Exhaust Manifold

This is Important - Please Take Note

Original factory illustration comparing RD exhaust manifold gaskets 302607 and 302608 and their mating manifold parts

Refer to page 164-30 of the Service Manual. The exhaust manifold assembly procedure as affected by order of gasket installation.

Since there has always been the possibility of transposing positions of gaskets #302607 and #302608 to permit water entering the exhaust chamber and subsequently the power head, gasket #302608 is now being cancelled and deleted from the assembly. In its position install gasket #302607 - using now two (2) #302607 gaskets in the assembly rather than one #302607 and one #302608 as formerly.

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

Factory gasket replacement

Johnson RD models: Use two gasket 302607 in the exhaust manifold assembly. Gasket 302608 was cancelled. The original bulletin references Service Manual page 164-30.

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