Fuel Injector
Repair / Disassembly and reassembly
A5.05. 07.09.01.00
M20
en / 31.05.2010 IB001412 2/2
07
Sequence of operations:
1. Disassembly
1.1 Loosen nut (Fig. 1/1) and relieve pressure spring (2) by
unscrewing setting spindle (3).
1.2 Loosen and screw off nozzle nut (4) by turning to the left.
1.3 Remove nozzle element (5) with needle, without damaging
the lapped surfaces or coming into contact with the fingers.
Take care of cylindrical pin (6).
1.4 Unscrew adjusting screw, check pressure spring and
compression bolt (7) visually.
1.5 Clean all parts with gas oil.
1.6 Insert nozzle needle with gas oil into the nozzle element and
check whether the nozzle needle falls onto the seat through
its own weight. If the needle hangs or sticks, replace it
together with the element.
1.7 Subject all parts, especially seat and contact faces, to a
visual inspection. Replace defective parts.
2. Reassembly
2.1 Wipe all contact faces dry with clean paper.
2.2 Renew O-ring seal (8).
2.3 Coat thread of the fuel injector housing and the recess of the
nozzle element with Molykote paste “G-Rapid Plus”.
2.4 The reassembly of the fuel injector is carried out in reverse
order to the disassembly procedure.
2.5 Tighten nozzle nut (4) with a torque of
M = 250 Nm.
2.6 Adjust fuel injector in accordance with 07.08.01.nn.
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