Volvo Penta D2-55 Workshop Manual page 68

Group 23 Fuel system
3 4
2
1
1. Injector nut
2. Injectors
3. Joining piece
4. Compression screw
5. Spring
66
9
8
7
6
5
6. Adjustment shims
7. Injector holder
8. Washer
9. Nut
Overhauling injectors
1. Clean the injector externally.
2. Fix the injector (holder) in a vise. Unscrew the in-
jector nut and disassemble the injector.
Note. Be careful that the injector nozzle does not fall
out during disassembly.
3. Pull the injector nozzle out of the injector sleeve
and put the components in cleaning petrol (gaso-
line).
Note. Make sure that the injector needles and injector
sleeves which belong with each other, and fit together,
are not mixed up if several injectors are cleaned at the
same time. To avoid mixing up, the injectors should
be put in an injector stand or in different compart-
ments.
4. Check the injector nozzle thoroughly with a lamp
magnifier or nozzle microscope. Also check the
other components.
5. When installing a new nozzle it is important that
the conserving oil is cleaned off the injector nee-
dle and sleeve before the injector is assembled
(avoid skin contact with the needle's sliding sur-
face).
Clean the components in chemically pure petrol
(gasoline). Check that the needle slides in the
sleeve with no tendency to bind.
6. Dip the injector components in pure Diesel or test-
ing oil, and fit the components together. Use the
original thickness of adjustment washer(s) to set
the opening pressure.
7. Check the opening pressure, jet pattern and seal-
ing in an injector tester.