Evinrude 4906B 4HP 1969, Owner'S Manual

Page: 264 / 422

with the shift cable disconnected, the
problem must be in the lower unit. To
verify the problem is in the lower unit, have
an assistant
turn the propeller and at the
same time move the shift cable back-and-
forth. Determine if the clutch engages
properly.
Jumping out of Gear
If a loud thumping sound is heard at the
transom while the boat is underway, the unit
is jumping out of gear,
the propeller does
not have a load, therefore the rushing water
under the hull forces the lower unit in a
backward direction. The unit jumps back
into gear; the propeller catches hold; the
lower unit is forced forward again, and the
resul t is the thumping sound as the action is
repeated.
Normally this type of action
occurs perhaps once a day, then more fre-
quently each time the clutch is operated,
until finally the unit will not stay in gear for
even a short time.
The following areas must be checked to
locate the cause:
1-
Check the bellcrank under the power-
head. This is accomplished by first checking
in the Appendix to determine the type of
shift mechanism installed on the unit being
NEUTRAL
FAST
Diagram
to
illustrate the Shift positions
and
throttle
range
of a
dual lever shift control box.
TROUBLESHOOTING 8-5
View into the exhaust housing after the powerhead
has been removed. The bellcrank part
of
the upper
mechanical shift mechanism is clearly visible.
serviced. If the Appendix check reveals the
power head must be removed in order to
check the shift mechanism, then the power-
head must be removed. If the unit has a
window in the exhaust housing, then the
window must be removed. Hold the shift
rod with a pair of pliers and at the same
time attempt to move the shift lever on the
starboard side of the engine. If it is possible
to move the shift lever, the bellcrank is
damaged.