Yanmar 6LY3 series - Page 174

FUEL SYSTEM
Fuel Feed Pump Components and Functions
6-32 6LY3 Service Manual
© 2007 Yanmar Marine International
Maximum Fuel Feed Volume Test
The special equipment illustrated in Figure 6-41
will be needed for conducting maximum delivery
pressure and delivery volume tests. NOTICE:
NEVER run the engine for more than 5 minutes.
The fuel injection pump may be damaged if
operated in non-injection condition.
Figure 6-41
Figure 6-41
1–Valve “B”
2–Valve “A”
1. Operate the injection pump at the specified
600 rpm and read the pressure gauge indicator
when Valve “B” (Figure 6-41, (1)) is closed.
2. Tighten Valve “A” (Figure 6-41, (1)) so the
pressure gauge indicator does not move when
pressure is applied.
3. Replace the piston spring if it is defective.
Delivery Test
1. Open Valve “A” (Figure 6-42, (2)).
2. Operate the fuel injection pump at the specified
1000 rpm.
3. Open Valve “B” (Figure 6-42, (1)) until the
pressure gauge indicator shows 0.1 MPa
(1 kg / cm
2
) (14.5 psi). Measure the delivery
rate for 1 minute.
Figure 6-42
Figure 6-42
1 – Valve “B”
2 – Valve “A”
Volume Pressure: 0.22-0.31 MPa (2.2-3.2 kg / cm
2
)
(31.9-44.9 psi)
rpm: 600
(2)
(1)
0005705
Delivery Test Specifications
Volume: 1.8 L / min. (0.475 gal.)
Back pressure: 0.1 MPa (1 kg / cm
2
) (14.5 psi)
rpm: 1000
(1)
(2)
0005706