Volvo Penta D25A MS Operator's Manual page 49

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Fuel injection nozzle spray pattern
Check spray conditions when checking fuel injection
pressure. Good spray conditions are as follows:
· Fuel is injected from all nozzle holes.
· The fuel is sprayed in a conical shape.
· No big particles but fine ones.
· No oil drip is left after injection.
If the nozzle fails to spray fuel properly, replace with a
new one.
NOTE! Fuel injection pressure and nozzle spray pat-
tern check intervals may be extended in steps of 250
hours if they are ok at 1000 hrs.
Adjust the fuel injection pressure
1. To adjust injection pressure, remove the set
screw from the nozzle holder, loosen the cap nut,
and then turn the adjusting screw. To increase
the injection pressure, tighten the screw. To de-
crease the injection pressure, loosen the screw.
2. When the pressure meets the standard value,
tighten the cap nut to 69 - 78 Nm (7 - 8 kpm)
[51 - 58 lbf.ft].
3. Tighten the set screw to 34 - 44 Nm
(3.5 - 4.5 kpm) [25 - 33 lbf.ft].
Fuel injector nozzle installation
1 . Remove the nozzle inlet connector from the fuel
injection nozzle.
2. Attach three 0-rings to the nozzle and grease
them.
3. Apply a small amount of grease to a gasket and
attach to the nozzle.
4. Insert the nozzle into the cylinder head aligning its
inlet connector hole to the connector hole in the
head.
5. Attach the nozzle inlet connector to the nozzle by
applying the specified torque, 64 to 74 Nm (6,5
to 7,5 kpm) [47 to 54 lbf].
6. Attach the nozzle gland and tighten the nut at the
specified torque (98 N -m (10 kgf m) [72 lbf]).
7. Attach the injection pipe and fuel leak-off pipe.
8. Before mounting the rocker cover, operate the
engine at approx. 850 rpm and check for any fuel
leakage from each joint. Install the rocker cover
after confirming no fuel leakage.
Maintenance: Fuel System
49