Operation Manual

Job Card No.:
Engine:
Filing No.:
Injection Timing
0178-17-10 1157
07.06.01 Page 1 of 2
S/BV 6/8/9 M 628
Adjusting the commencement of injection and
hence the firing pressures is permissible only
when the pressures depart from the Accep-
tance Certificate. Such fault may be due to
excessive backlash of the injection pump
drive gear, coupling out of adjustment, wear in
the injection pump drive, excessive backlash
of pump drive gear.
An advancement of the commencement of
injection raises the firing pressure and vice
versa. Prior to any adjustment of the setting,
check that injector, injection pipe and injection
pump are in good shape and condition.
An adjustment as described hereafter ensures utmost accuracy since the measurement involved considers
any wear both in the pump drive and the actual pump.
Job:
Setting the Commencement of Injection at the Injection Pump Coupling
Stop engine. Place control level in “run” position. Shut off fuel suction line between engine and fuel service
tank and between overflow line and injection pump (1). Unscrew bleed plug on fuel filter (2). Fit banjo bolt with
pipe (3) (see under “Tools”) to filter and connect pipe (3) to testing pump (4). Disconnect injection line (5) for
No. 1 cylinder from injector, connect spill pipe (6) and place container (7) thereunder.
Turn engine until roller tappet of No. 1 cylinder rests on the cam base circle. Operate testing outfit until fuel
emerges in a vigorous jet. While pumping, slowly turn engine in the normal running direction.
Once the fuel jet breaks, stop turning and pumping because at this point the commencement of injection is
properly set according to the acceptance documents. Failing this, re-adjust (see page 2).
If you continue pumping, this may result in damage to the fuel L.P. system.
Measure distance “b” on the flywheel periphe-
ry from No. 1 cylinder TDC mark to the fixed
arrow on the crankcase. Convert this value to
degress crank angle and compare with the
Acceptance Certificate.
Fig. 1
Tools:
- Standard tools
- Spill pipe
- Injector testing outfit (Section 1)
- Pipe from testing pump to fuel filter
- Torque wrench
Job Card:
- 07.03.01
Injection Timing
(Setting the Commencement of Injection)
Following any work on the injection pump drive, test
the commencement of injection on the pump ele-
ment for the No. 1 cylinder.
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