Bleeding And Checking Injection Timing - Yanmar 4LHA-HTP Operation Manual

Chapter 3 Fuel Injection Equipment

2. Bleeding and Checking Injection Timing

2. Bleeding and Checking Injection Timing
1 . Air bleeding in the fuel system
If the engine is operated when the fuel tank is empty, or with
the fuel tank outlet cock closed, air is sucked into the fuel oil
system, and the engine stops. When this happens,
vent the air as follows:
(1) Add fuel to the fuel tank.
(2) Loosen the air-vent screw on the fuel oil filter, and push
the fuel feed pump priming lever several times.
When no air is observed in the fuel, tighten the air-vent
screw firmly.
(3) Loosen the hexagonal bolt on the fuel pump. Push the fuel
feed pump priming lever to vent the air. After venting the
air, firmly tighten the hexagonal bolt.
(4LHA-HTE/HTZE/HTP/HTZP)
F.O. feed pump
priming lever
_ 1 I F.O. feed pump
3-1-2
t4LHA Series