Lister Petter TR1, Руководство по ремонту

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page 32
Section 02
Engine Servicing and Adjustments
- fuel injector
Cleaning an Injector
• A thoroughly cleaned container holding a supply of
clean, fresh fuel oil should be available for washing
dismantled parts.
• The components of each individual injector should
be kept together at all times.
• Never use paraffin or woven cloths; it is permissible
to use non-fluffing paper during the cleaning
process.
• Components should be assembled wet.
Setting the Injector
To ascertain if the injector is in good condition, it is
removed from the engine and connected to a fuel
injector test rig, similar to the one shown.
Figure 2.26.3 Typical Injector Test Rig
If a rig is not available it becomes necessary to
replace the complete injector by a new or serviced
one which has a clean nozzle and has been correctly
set.
All sprays should have the same appearance and
the same length of penetration in the air. If one spray
is shorter or weaker than the others this means that
the corresponding hole is partially blocked and best
results will not be obtained. If one hole is totally blocked
or the nozzle dribbles it must be replaced.
When a new nozzle is fitted the injector must be
reset on a test rig. After testing and resetting the
injector top plug must be torque loaded to 27.1 Nm
(20.0lbf ft).
Note:
Injector setting pressures can be found in 'Technical
Data" in the relevant engine section.
WARNING
Under no circumstances allow unprotected skin to come
into contact with the spray as the fuel may enter the blood
stream with fatal results.
Injector Back Pressure
The leak-off rate is 6-27 seconds between 172-
142bars (170-140atmos) on an injector tester using
Calibration C fluid, at a temperature of 15.5°C (60°F).
Replacing an Injector
If the injector sealing washer has been used more
than once it will become compressed and may
adversely affect combustion. Care should be taken to
ensure two washers are not fitted.
1. Examine the oil seal ring for damage or cuts,
replace if necessary.
2. Ensure the injector sealing washer has been
removed and the seating in the cylinder head is
clean and smooth.
3. Lightly smear a very small amount of high melting
point grease to one side of a new injector sealing
washer and place it over the injector nozzle, greased
side first.
4. Replace the leak-off pipe to the injector.
5. Fit the injector into the cylinder head.
TS/TR Engines:
6. Replace the clamp and leave the Alien screw finger
tight.
7. Replace the fuel pump to injector pipe - do not
tighten.
8. Replace the leak-off pipe into the fuel tank.
9. Torque the clamp screw to 21.0Nm(15.5lbf ft).
10.Torque all fuel pipe nuts to 28.5Nm (21.0lbf ft) and
the leak-off pipe swivel union to 4.0Nm (3.0lbf ft).
11. Replace the cylinder head covers.
12.After the initial run following an injector replacement
re-torque the injector clamp screw.
TX Engines:
13.Replace the clamp and leave the nuts finger tight.
14.Replace the fuel pump to injector pipe - do not
tighten.
15.Push the leak-off pipe onto the injector.
16.Torque the clamp screw to 8.0Nm (6.0Ibf ft).
17.Torque all fuel pipe nuts to 28.5Nm (21.0lbf ft).
18.Replace the leak-off pipe into the fuel tank.