4-8 SHB 28Z3 EN – Edition 2.0 * 28z3s410.fm
Engine
Notice!
Apply a thin coat of oil to the threads and contact surfaces before mounting.
Caution!
Bear in the mind the order for tightening the cylinder-head bolts!
4.6 Checking the injection nozzles
Pressure check
☞ Ball-type cock on fuel filter in the “OFF” position
☞ Clean the area around the nozzles
☞ 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 gauge
☞ 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: 118 – 128 bar (1713 – 1858 psi)
• Spacer thickness of 0.1 mm (0.004”) corresponds to modification by 6.9 – 9.8 bar (100
– 142 psi)
• Check the pressure again
• 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
• Install the nozzle
• Open the ball-type cock on the fuel filter again
Fig. 3: Nozzle tester
Leak oil line Compression
spring seat
Nozzle needle
Pressure spring centring
Nozzle body
Lower nozzle screw fitting
Compression
spring
Upper nozzle screw fitting
Spacers
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