Johnson Service Bulletin SB-969 - Sealing Motor Mount to Adaptor Plate

Issued August 15, 1963, this factory bulletin explains the use of Sealer 1000 when reinstalling motor mount part 377292 on Johnson V-4 engines.

Johnson Motors Service Bulletin gray factory letterhead

August 15, 1963 SB-#969

SUBJECT:  SEALING MOTOR MOUNT TO ADAPTOR PLATE.

ENGINES AFFECTED:  All V-4 Engines

You may occasionally find it necessary to remove Part No. 377292 Motor Mount from the adaptor plate - either to replace the mount, or as part of some service repair operation.

Factory photograph showing Sealer 1000 being applied to the gray area of the motor mount
Sealing motor mount to adaptor plate.

Before securing the mount back to the adaptor plate, coat its top side liberally with Sealer 1000. So doing prevents oil seepage from the driveshaft casing area and thus reduces the occurance of mount breakage, which, in this case, results from gas and oil penetrating the molded rubber.

Secure mount to adaptor immediately after coating since Sealer 1000 dries quite rapidly.

Sincerely,
JOHNSON MOTORS
Robert Compton
Administrative Assistant

RC:eb

NOTE:  Post on your V4-50 and V4-75 H.P. indexes.

Historical notes

This bulletin addresses sealing the motor mount to the adaptor plate, not replacing the mount itself. The factory specifies part 377292 and Sealer 1000.