Technical data

I
njection pump
Remove Injector nozzle
28
Injector overhaul
Extreme cleanliness is necessary during work on
injector.
- Unscrew sleeve nut F (22 mm) and withdraw
injector jet G
- Clean jet with correct apparatus, not with sharp
tool, wire brush or similar. All traces of carbon
should be removed.
Injector should be replaced as a complete unit if:
- Jet needle H is damaged or eroded
- Overheating of the needle and jet has occurred
(blueing)
- Taper of jet needle does not seal
- Adjust the injection pressure by inserting or
removing shims at the injector spring
NOTE
A shim with a thickness of 0.1 mm
changes the pressure by approx.
15 bar
- Unscrew the screw cap and remove the injector
nozzle
CAUTION
 Clean the nozzle only with a
Bosch nozzle cleaning device.
 Do not use hard objects as steel
brushes, wire or similar.
 Carry out the cleaning and
testing of the nozzle with a
maximum of cleanliness, rinse
injector parts in clean fuel only.
Microscopically small particles
can lead to wear and
malfunction.
NOTE
A malfunctioning nozzle leads to,
amongst other things, poor combustion
(black exhaust smoke), poor
performance and overheating of the
cylinder head, piston and cylinder.
Injector operation check and adjustment
This should be carried out as completion of checking
operation of injector pump.
- With special tool 74 64 1 333 545 fitted to
injector pump. See page 32