PERIODIC MAINTENANCE
Periodic Maintenance Procedures
12/05
6LY3 Service Manual
4-17
© 2007 Yanmar Marine International
1. Injection Pressure Measurements
Check the No. 1 (lower) opening pressure for a
rough reference point. To measure and adjust the
No. 1 and No. 2 opening pressures precisely,
specialized knowledge, techniques and
equipment are required. Consult your authorized
YANMAR marine dealer or distributor.
(a) Install the fuel injection nozzle to the nozzle
tester and bleed air from the union nut
(Figure 4-15, (1))
.
Figure 4-15
Figure 4-15
1 – Union Nut
(b) Pump the tester handle several times as
quickly as possible to discharge foreign
matter from the injection hole.
Figure 4-16
Figure 4-16
(c) Slowly pump the tester handle and observe
the pressure gauge.
(d) Read the pressure gauge when the injection
pressure begins to decrease. If No.1
opening pressure is out of limits, measure it
precisely at an authorized FIE (Fuel Injection
Equipment) service shop or replace the
nozzle.
NOTICE: Only No. 1 opening
pressure can be measured with this method.
Specialized equipment is required to
measure No. 2 opening pressures precisely.
Consult your authorized YANMAR marine
dealer or distributor.
(e) After the injection test, check that there are
no drops from the injection hole.
Figure 4-17
Figure 4-17
0006172
(1)
000617
3
No. 1 Opening Pressure
24.00-24.98 MPa
(3481-3623 psi)
0006174
