SB-#963
July 10, 1963
SUBJECT: Excessive Dowel Pin Height - Forward Gear Bearing
ON PART: Replacement gearcase FOR ENGINE: 18 H.P.
Field reports indicate that a number of 18 h.p. replacement gearcases
have been received by Dealers on which the forward gear bearing dowel
pin is too high. This prevents the bearing from being cradled properly
by the housing and if undetected during repair work can create gear/
bearing bind.
Always check for this condition when replacing a gear housing on an
18 H.P. engine. If the dowel pin protrudes too far above casting, it
may be driven into the housing further with a punch and hammer. Correct
height above the casting for this pin is .050", or, slightly less than
1/16 inch. Be cautious and make frequent measurements when driving the
pin deeper, so that the pin is not driven beyond the point where it
engages the bearing. This would render the gearcase unusable, since
this dowel pin is not a serviced item.
Sincerely,
JOHNSON MOTORS
R. Compton
Administrative Assistant
RC:eb
NOTE: Post on your FD - 18 h.p. index.