ENGINE
Disassembling the Engine and Components
5-18
6LY3 Service Manual
© 2007 Yanmar Marine International
Removing the Engine from the
Vessel
For engines installed in the engine room of a
vessel, remove the piping and wiring connecting
them to the vessel.
1. Disconnect the battery.
2. Disconnect the electronic control system.
3. Disconnect the wiring between the starting
motor and the battery.
4. Remove the exhaust rubber hose from the
mixing elbow.
5. Remove the rubber hose connecting the
coolant recovery tank to the filler cap.
6. Remove the seawater inlet hose from the
seawater pump.
NOTICE: Remove the hose
after making sure the seacock is closed.
7. Remove the fuel inlet hose from the fuel feed
pump.
8. Remove the body fit (reamer) bolts and
disassemble the propeller shaft coupling and
thrust shaft coupling.
9. Disassemble the PTO coupling from the front of
the engine, if installed.
10. Remove the flexible mount nuts. Lift the engine
and remove it from the engine base. (Leave the
flexible mount attached to the engine base.)
Draining the Coolant
1. Open the two seawater drain cocks
(Figure 5-2, (1) and (3))
to drain the seawater.
2. Open the two coolant drain cocks
(Figure 5-2, (4) and (7))
to drain the coolant.
Figure 5-2
Figure 5-2
1 – Seawater Drain Cock
2 – Coolant Tank
3 – Seawater Drain Cock
4 – Coolant Drain Cock
5 – Seawater Pump
6 – Coolant Pump
7 – Coolant Drain Cock
Draining the Engine Oil
Remove the dipstick guide retaining bolt and drain
the oil from the engine.
NOTICE: If an oil supply /
discharge pump is used, install the hose in the
dipstick guide.
Removing the Electrical Wiring
Remove the wiring from the engine.
0005771
(7)
(1)
0005772
(
3
)
(4)
(5)
(2)
(6)
