April 25, 1960
Bulletin No. SB-779
SUBJECT: REDUCING STEERING EFFORT ON 1960 V-4 ENGINES - 75 H.P.
It has been brought to our attention through testing
and field reports, that a considerable amount of
effort is required to steer the 1960 V-4 motors,
primarily on single installations with heavy loads,
as well as on twin installations. As stated in
previous bulletins, steering effort can be greatly
affected by a wrong tilt position of the motor,
and improper trimming of the boat.
Engineering has designed a new exhaust outlet, figure
2, which, extensive testing has shown, greatly reduces
steering effort on these unusual installations.
Motors now being produced are incorporating this
modified exhaust outlet. On installations where
proper tilt and trim do not eliminate or greatly
reduce steering effort, we suggest replacing the
old exhaust outlet, Part No. 307110, figure 1,
with the modified exhaust outlet, figure 2, which
will carry the same part number. The modified
exhaust outlet is easily distinguishable from the
old exhaust outlet as shown in the photos. The
new exhaust outlet will be sent to you no charge
by the Service Department upon receipt of your
request giving model and serial number of motor,
along with make and size of boat on which steering
effort is a problem.
When replacing the exhaust outlet, removing the
gearcase is necessary in order to reach the front
mounting bolt of the outlet. While the gearcase is
removed, please double check to make sure the
external tooth lockwashers under the stud nuts have
been replaced by spring lockwashers in accordance
with service bulletin No's. SB-756 and SB-766.
JOHNSON MOTORS
W. W. DeWees
Service Department
WWD:eb
NOTE: Post on your V4 series index - 75 H.P.
Figure 1
Old Outlet
Figure 2
Modified Outlet
W. W. DeWees