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3.11 Fuel Oil System
The engine revolutions are transmitted to the camshaft by
the driving gear of the fuel pump via the timer.
The feed pump activated by the camshaft rotations sucks
fuel oil from the fuel tank and feeds it to the fuel filter at the
pressure of about 0.33 MPa (3.4 kgf/cm
The filtered fuel oil is sent to the oil sump in the pump
housing and is pressurized by the plunger. The fuel oil then
flows through the injection pipe and nozzle holder and is
injected from the nozzle to each cylinder.
3.11.1 Fuel Injection Pump
The Yanmar YPES-PS fuel injection pump is an integrated
type and the engine revolutions are transmitted to the cam-
shaft of the pump through the driving gear and advance timer.
(1) Specifications
Plunger dia.
Plunger pre-stroke
Delivery valve suck-back q'ty
Delivery valve dia.
Cam lift
Thrust clearance
Plunger spring free length
Plunger spring constant
Delivery valve spring free length
Delivery valve spring constant
).
2
Automatic timer
6CXM-GTE/
Unit
6CXM-GTE2
mm
13
mm
3.5
3
70
mm
/st
mm
7
mm
12
mm
0.01 - 0.05
mm
54
N(kgf)/mm
36.7 (3.74)
mm
21
N(kgf)/mm
9.26 (0.944)
Fuel injection pump
Fuel feed pump
- 3-29 -
Boost compensator
Governor
Damping valve
Delivery valve
Plunger barrel
Plunger
Control rack
Tappet
Fuel cam
(YPES-PS type)
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