SHB 28Z3 EN – Edition 2.0 * 28z3s410.fm 4-9
Engine
4.7 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 (12”) away from the nozzle and let the nozzle
eject fuel
☞ The nozzle jet must create a shape on the paper as shown below
4.8 Injection time
Checking injection time
Preparatory work:
• The fuel system must be filled and bled
• Clean the injection pump and keep it clean
☞ Checking cylinder 1 is basically sufficient and serves the purpose, but all other cylin-
ders can also be checked
☞ Apply current to the cutoff solenoid, or remove the cutoff solenoid and the O-ring from
the injection pump
➥ Fuel supply is enabled
☞ Set the throttle to the maximum speed
☞ Remove the cap on the flywheel housing, see Fig. 4
➥ The view to the ring gear is opened
☞ Position a spanner on the screw of the pulley (on the crankshaft) and turn clockwise
➥ Or turn the ring gear on the flywheel with a screwdriver
☞ Turn until top dead centre marks B on the ring gear for cylinder 1 are visible and at the
same level as mark 5/F on the flywheel housing
➥ There are several marks on the ring gear depending on the number of cylinders of
the diesel engine; each individual mark can be used with the corresponding cylinder
for testing purposes
➥ Top dead centre can be assigned to the correct cylinder with the number B stamped
next to it
Normal
-------------------------------------------------Variation-----------------------------------------------
Fig. 4: Flywheel housing cap
Fig. 5: Top dead centre mark
B
F
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