Yanmar 4LHA-HTP User Manual

Chapter s Fuel Injection Equipment
1. Fuel Supply System
4LHA Serit
1. Fuel Supply System
1-1 Fuel supply system
The YPES-AL fuel injection pumps are in-line. The
engine gears drive the camshaft via the timing gears.
The camshaft then drives the feed pump, pumping fuel
from the tank to the filter at a pressure of
0.118(1.2)MPa(kg-f/cm'). The filtered fuel is fed to the
reservoir in the pump housing, where the plunger
raises its pressure. The fuel then passes through the
injection pipe for injection into each cylinder via the fuel
injection nozzle.
(I
(
Fuel tank
The Model YPES-AL fuel injection pump is an in-line
pump with a governor.
A camshaft is built into the pump. There are a drive
cam for the fuel feed pump and tappet-drive cams for
the plunger.
A pump driving gear is mounted on the drive side of
the camshaft, and a governor weight on the opposite
side.
As the plunger rises, the fuel oil opens the delivery
valve and passes through the high pressure pipe to the
fuel injection nozzle.
When the control rack is connected to the governor
lever moves, the control sleeve turns the plunger.
This changes the point at which the helix (lead groove)
opens the port and thereby controls the amount of
fuel injected.
1-2 Fuel injection pump specifications
Type
YPES-AL
Specifications
See separate
service data
3-2-1

Yanmar 4LHA-HTP Specifications

General

Brand	Yanmar
Model	4LHA-HTP
Category	Engine
Language	English