1. Injector - Volvo MD2010 Workshop Manual

Fuel system
I njectors
Replacement of injectors
1.
Wash clean round the injectors.
2.
Release the delivery pipes at the injection pump
and at the injectors. Lift off the delivery pipes to-
gether.
3.
Remove the nut on the top of each injector and lift
off the fuel leak pipe.
Fig.102. Dismantling of injector

1. Injector

3. Heat shield (MD2030)
2. Copper packing 4. Insert (MD2O10-2030)
4.
Unscrew the injectors. Use socket, L = 80 mm.
Socket width = 22 mm (MD2O10, 2020, 2040),
socket width = 27 mm (MD2030)
Remove the copper packings under the injectors.
MD2030: Remove the heat shields (3, Fig. 102).
MD2O10, MD2020, MD2030: Remove the inserts
(4) and the inner copper washers.
5.
Fit a protective cap on the pipe connections on the
i njectors over the nozzle if the injector is not to be
fitted immediately.
6. Fit the new injector.
Tightening torque: see Technical data.
60
7. Fit the fuel leak pipe.
8. Fit the delivery pipes. Check that they do not come
skew, and tighten the nuts.
Tightening torque: 20-25 Nm (14.7-18.4 ft.lbs).
9. Start the engine and check that no leakage occurs.
Renovating injectors
1.
Clean the injector internally.
2. Place the injector (holder) in a vice. Unscrew the
nozzle nut and take the injector apart.
Note: Observe care when taking it apart so that the
nozzle needle does not drop out.
3.
Pull out the nozzle needle from the nozzle sleeve
and place the parts in cleaning petrol.
Note: Make sure that the nozzle needles and nozzle
sleeves which belong together and are adjusted to
each other are not mixed up if several nozzles are
cleaned together. To avoid confusion the nozzles .
should be placed in a nozzle rack or in different
compartments.
4. Check the nozzle carefully with a lamp magnifier or
i n a microscope. Check the other parts also.
5. When fitting a new nozzle it is important that pre-
serving oil is washed off the nozzle needle and
sleeve before the injector is assembled (avoid skin
contact with needle's slide surface).
Clean the parts in pure alcohol. Check that the
nozzle needle slides in the sleeve without sticking.
6. Dip the nozzle parts in pure diesel or testing oil and
put the injector together. Use the original thickness
of adjuster washer(s) to set the opening pressure.
7.
Check the opening pressure, jet pattern and tight-
ness in a nozzle testing device.