Fuel Injection Nozzle Adjustment - Yanmar 6LPA-STP2 Service Manual

FUEL SYSTEM
5. NOTICE: Wash the nozzle in clean diesel fuel.
NEVER touch the nozzle mating surfaces with
bare hands. Incline the nozzle body by about
60° (Figure 6-22, (1)) and pull out the needle
tip by about 1/3 of its overall length.
Figure 6-22
Figure 6-22
6. Check that the needle tip returns smoothly into
the body by its own weight. Repeat the above
test several times after turning the needle tip
(Figure 6-23). If the needle tip fails to return
smoothly, replace the nozzle assembly.
Figure 6-23
Figure 6-23
6-18

Fuel Injection Nozzle Adjustment

NOTICE: High precision is required for needle lift
and pre-lift measurements. Thoroughly clean the
parts and tools before measuring.
Pre-lift Adjustment
Needle Lift Adjustment
1. Attach the special tool to the dial indicator and
Figure 6-24
(1)
0005273
2. Adjust the dial indicator reading on the special
Figure 6-25
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© 2007 Yanmar Marine International
adjust the stem to 3.0 mm (0.118 in.) or less
(Figure 6-24, (1)).
Figure 6-24
tool or square block to zero, using the special
tool (Figure 6-25, (1)).
Figure 6-25
6LPA Service Manual
Fuel Injection Nozzle
(1)
0005284
(1)
0005285