Throttle And Shift Lever Operation; Acceleration And Deceleration; Shifting The Engine - Yanmar 1GM10 Operation Manual

ENGINE OPERATION
The engine will seize if it is operated
when cooling seawater discharge is
inadequate or if load is applied without
any warm-up operation.
• Is the seacock open?
• Is the inlet of the seacock on the hull
bottom clogged?
• Is the seawater suction hose broken or
does the hose suck air because of a
loose clamp?
When operating the engine at low speed
for long periods of time, race the engine
once every two hours. Race the engine
with the clutch in NEUTRAL, accelerate
from the low speed position to the high
speed position and repeat this process
about five times. This cleans out carbon
from the cylinders and the fuel injection
valves.
Neglecting to race the engine will result in
poor smoke color and reduce engine
performance.
Periodically operate the engine near
maximum speed while underway. This will
generate higher exhaust temperatures,
which will help clean out hard carbon
deposits, maintain engine performance
and prolong the life of the engine.
For troubleshooting assistance, see
Troubleshooting After Starting on page 65
or Troubleshooting Chart on page 67 .
If necessary, consult authorized Yanmar
Marine dealer or distributor.
42
THROTTLE AND SHIFT
LEVER OPERATION

Acceleration and Deceleration

Note: Direction of travel will vary
depending on installation
location.
Use the throttle handle to control
acceleration and deceleration. Move the
handle slowly.

Shifting the Engine

Shifting the marine gear while operating at
high speed or not pushing the handle fully
into position (partial engagement) will
result in damage to marine gear parts and
abnormal wear.
1. Before using the marine gear, be sure
to move the throttle handle to a low idle
position (less than 1000 rpm). Move the
throttle handle slowly to a higher speed
position after completing clutch
engagement.
Never shift the marine gear at high
engine speed. During normal operation,
the marine gear should only be shifted
with the engine at idle.
2. When moving the handle between
FORWARD (Figure 4, (1)) and
REVERSE (Figure 4, (3)), bring the
clutch to NEUTRAL (Figure 4, (2)) and
pause before slowly shifting to the
desired position. Do not shift abruptly
from FORWARD to REVERSE or vise
versa.
GM Series Operation Manual