SHB 803 en – Edition 2.4 * 803s410.fm 4-7
Engine
4.5 Checking the injection nozzles
Pressure check
☞Remove the injection line and the injection nozzle
☞Connect the injection nozzle with the high pressure line of the nozzle tester
☞Slowly increase pressure until the nozzle ejects fuel and read the pressure off the pres-
sure gage
☞If the injection pressure is too low, replace the spacer in the nozzle by a thicker one. If
the pressure is too high, replace the spacer by a thinner one.
➥Injection pressure: 120 – 130 bar (1740 – 1885 psi)
• Spacer thickness of 0.1 mm (0.0039") corresponds to modification by 7 – 10 bar (101 –
145 psi).
• Check the injection nozzle for drips after it has ejected fuel.
☞Create a pressure of about 20 bar (290 psi) below injection pressure and check
whether fuel drips from the nozzle.
4.6 Checking the nozzle jet
☞Remove the injection lines and the injection nozzles
☞Connect the injection nozzle with the high pressure line of the nozzle tester
☞Quickly create pressure until the nozzle ejects fuel (ejection 3 – 4 times)
☞Hold a white sheet of paper about 30 cm (11.8") away from the nozzle and let the noz-
zle eject fuel
Leak oil line
Compression
spring seat
Nozzle needle
Pressure spring centring
Nozzle body
Lower nozzle
screw fitting
Compression
spring
Upper nozzle
screw fitting
Spacers
Fig. 4: Correct shape of nozzle jet
Fig. 5: Wrong shape of nozzle jet
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