Emergency Repairs For Marine Gear Trouble - Yanmar 4JH3-TE Operation Manual

6.2 Emergency Repairs for Marine Gear Trouble

If the marine gear should break, the boat will not run. In case of this emergency, follow the following proce-
dure for using the clutch emergency bolt to return to port.
Note:Cannot be used for KBW21 and KM4A marine gear.
NOTICE:
• Using the emergency bolt directly connects the clutch of the marine gear to the engine
making it possible to turn the propeller. However, when the engine is started and the pro-
peller turns, the boat will only move forward. The neutral and reverse positions cannot be
used.
The emergency bolt should only be used in cases where it is impossible to operate the
clutch and the boat must return to port. Ask your Yanmar dealer for repairs immediately
after returning to port.
• When using the emergency bolt, never use the clutch as this will break it.
• Operate at low speed, 1000rpm or less, and navigate carefully.
When approaching the pier, turn off the engine early and stop the boat.
Perform the following after turning off the engine.
1. Remove the hexagonal red bolts at the back of the
marine gear with a spanner.
2. Check to see if the emergency bolt is visible at the
back of the bolt hole.
When the emergency bolt is not visible, insert a turn-
ing stick little by little in the holes at the front side of
the V-pulley, turning it in the direction of the crank
shaft rotation and stopping when the emergency bolt
becomes visible.
3. Inset the emergency bolt tightening tool into the bolt
hole and tighten the emergency bolt.
4. There are 2 emergency bolts.
Follow the procedure described in 2. and 3. for the
second bolt, and tighten the bolts alternately applying
the same amount of force to each.
Tightening torque:18.6±1.0N•m(1.9±0.1kgf•m)
5. Replace the hexagonal bolt.
6. Fill with the marine gear oil set aside for emergencies
to the mouth of the filler port. (When the oil pump is
not working, there is no lubrication and filling with oil is
essential.)
7. Start the engine with the clutch handle in neutral and
proceed at low speed.
6. TROUBLE AND TROUBLESHOOTING
Turning
Turning direction
Turning stick
Position of emergency bolts
Forward shaft
back cover
KMH4A
Clutch
Emergency bolt
tightening tool
Bolt(red)
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