FUEL SYSTEM
6LPA Service Manual
6-25
Fuel Injection Nozzle
12/05
© 2007 Yanmar Marine International
Adjusting No. 1 Opening Pressure
1. Reassemble the fuel injection nozzle assembly
to the operating condition as shown in
(Figure 6-17).
• Align the holes of the nozzle holder body, tip
packing and nozzle holder body.
• If the adjusting shim thickness originally used
is unknown, use a shim 1.5 mm (0.06 in.)
thickness.
2. Install the assembly to the tester, pressurize
and read the pressure gauge when the injection
pressure begins to decrease. CAUTION!
ALWAYS wear eye protection when
servicing the engine.
• No. 1 opening pressure: 250 to 260 kgf/cm
2
,
24.52 to 25.50 MPa (3556 to 3698 psi)
• Determine if the nozzle operates normally or
not by listening to the swishing sound. If the
valve opening pressure is out of the specified
range, disassemble the nozzle and select an
appropriate adjusting shim to replace the shim
at the upper portion of No. 1 pressure spring
from the appropriate chart below.
Adjusting Shim Thickness
Note: Changing the adjusting shim thickness
by 0.025 mm changes the valve opening
pressure by approximately 3.8 kgf/cm
2
,
0.37 MPa (54 psi).
• Change only one adjusting shim at the upper
portion of No. 1 pressure spring.
3. After the injection test, check for leakage from
from the injection hole. There should be no
leakage.
Fuel Injection Nozzle Installation
1. Install a new O-ring onto the fuel injection
nozzle.
2. Insert a new nozzle seat in the hole in the fuel
injection nozzle of the cylinder head.
3. Install the fuel injection nozzle to the cylinder
head, using the nozzle holder clamp, washer
and bolt (Figure 6-42). Torque to: 255 kgf·cm,
25.01 N·m (18.4 lb-ft)
Figure 6-42
Figure 6-42
4. Install a new nozzle holder seal to the cylinder
head (Figure 6-43).
Figure 6-43
Figure 6-43
0.825 mm
(0.032 in.)
0.900 mm
(0.035 in.)
0.975 mm
(0.038 in.)
1.050 mm
(0.041 in.)
1.125 mm
(0.044 in.)
1.200 mm
(0.047 in.)
1.275 mm
(0.050 in.)
1.350 mm
(0.0531 in.)
1.425 mm
(0.0561 in.)
1.500 mm
(0.059 in.)
1.575 mm
(0.062 in.)
1.650 mm
(0.0649 in.)
1.725 mm
(0.0679 in.)
1.800 mm
(0.0708 in.)
1.875 mm
(0.0738 in.)
1.950 mm
(0.0767 in.)
2.000 mm
(0.0787 in.)
2.100 mm
(0.0826 in.)
2.175 mm
(0.0856 in.)
-
-
0005
3
05
0005
3
06
Содержание 6LPA-STP2
Страница 1: ...6LPA series 6LPA Service Manual SERVICE MANUAL 6LPA STP2 6LPA STZP2 P N 0B6LP G00100 MARINE ENGINES ...
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Страница 178: ...FUEL SYSTEM 6 2 6LPA Service Manual 2007 Yanmar Marine International This Page Intentionally Left Blank ...
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