Yanmar 3JH4E, Service Manual

Page: 89 / 350

2. Inspection and adjustment
69
2.2.3 Inspection every 50 hours or
monthly
Be sure to check the following points every 50
hours or monthly, whichever comes first.
(1) Drain the fuel filter
[3JH4E and 4JH4E]
1) Close the fuel cock of the fuel tank.
2) Loosen the cartridge type fuel filter by a filter
wrench. Drain off any water and dirt collected
inside.
3) After reassembly, be sure to bleed air from
the fuel system.
Fuel system air bleeding procedures
1) Check the fuel level in the fuel tank.
Replenish if Insufficient.
2) Loosen the air bleeding bolt at the top of the
fuel/water separator by turning it 2 or 3 turns.
When fuel, which does not contain air
bubbles, comes out of the bolt hole, tighten
the air bleeding bolt.
3) Loosen the air bleeding bolt of the fuel filter by
turning it 2 or 3 turns.
4) Feed fuel with the fuel feed pump by moving
the lever on the left side of the feed pump up
and down.
5) Allow the fuel containing air bubbles to flow
out from the air bleeding bolt hole. When the
fuel no longer contains bubbles, tighten the
air bleeding bolt. This completes the air
bleeding of the fuel system.
6) After the engine start-up, the automatic air-
bleeding device works to purge the air in the
fuel system. No manual air-venting is required
for normal engine operation.
No. Inspection item
(1) Drain the fuel filter.
(2) Check the electrolyte level in the battery
Cartridge type
fuel filter
Air bleeding bolt
011748-00E
Fuel nozzle
Air bleeding bolt
To fuel tank
Fuel filter
Fuel injection
pump
Fuel feed pump
010618-00E