Man D 2840 LE 301, Repair Manual

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Checking and adjusting start of fuel delivery
24
Checking start of delivery
Figs. 1 and 2
For the purpose of checking the start-of-delivery
setting, an “OT” (= TDC) mark and a scale from
10 ... 50
_
before TDC are engraved on a disc
Á
fitted in front of the torsional vibration damper.
The scale marks are read against a pointer
À
fitted
to the crankcase.
In order to enable the engine to be rotated manu-
ally during adjustments, there is a plate with a cen-
tral hexagon driver
Â
fitted to the front of the
crankshaft pulley (barring device).
An engine cranking device (special tool) may be
mounted also at the inspection hole of the flywheel
housing. For this purpose, the speed pickup
together with the plate is to be previously
detached.
Fig. 3
There is another scale engraved on the flywheel
which can be read through an inspection hole in
the flywheel housing but access may be difficult.
The scale should be used for readjusting the
pointer after the vibration damper has been re-
moved or replaced.
In other words, before the vibration damper with
the scale disc is installed, the engine should be
positioned at “OT” (top dead centre) by means of
the scale on the flywheel.
The pointer should then be aligned such that its
measuring edge exactly coincides with the “OT”
mark on the scale disc.
Fig. 4
To avoid incorrect readings, always look past the
notch on the flywheel housing and straight towards
the flywheel centre.
The marking on the graduated scale must be on
the imaginary “notch - flywheel centre” line.
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