Yanmar 4JH3-TE, Operation Manual

Page: 43 / 65

5. MAINTENANCE & INSPECTION 39
5.2.2 Inspection Every 50 Hours
(1) Draining the Fuel Tank
1. Put a pan under the drain to catch the fuel.
2. Loosen the drain cock at the bottom of the fuel tank,
and drain off any water and dirt collected inside.
3. Once the water and dirt have been drained off and the
fuel coming out is clear, close the drain plug.
(2) Drain the fuel filter
When water and dirt are mixed in with the fuel, it becomes impossible for the fuel injection pump and the fuel
injection valve to work. Drain periodically to keep the filter from becoming clogged. When there is a lot of
drain collected in the oil/water separator, at the bottom of the fuel filter, the fuel filter alarm lamp will light up.
1. Close the fuel cock.
2. Loosen the plug screw at the bottom of the fuel filter
oil/ter separator, and drain off any water and dirt col-
lected inside.
3. Retighten the plug screw.
4. Be sure to bleed air out of the fuel system.
→
See 3.2.2
When there is a heavy deposit, drain the fuel tank at the
same time.
OPTION
To engine
Drain cock
Sediment tank
Fuel filter
Tighten
Plug screw
Loosen