101
Injection timer,
checking DH10A, 345, 360
Special tools:
(999) 8060 Crank tool
8190 Measuring instrument
1.
Crank the flyhweel to where the 0
°
mark is oppo-
site the indication pin.
2.
Connect up the measuring instrument’s two sen-
sors: one on the injection pump governor housing
and the other on the right-hand side of the flywheel
casing; the upper inner hole (1) is used if the bus
has automatic transmission. The lower outer (2) is
used for a manual gearbox and for the Voith auto-
matic transmission.
3.
Check the basic timing for the injection pump by
reading-off the instrument at low idle. Compare
the reading with the value in the diesel test stand-
ard for the engine in question. If necessary, adjust
the basic timing.
4.
Increase engine speed to 1200 r/min and check the
timing value on the measuring instrument. The in-
crease engine speed to 1800 r/min and check the
pre-timing value. The pre-timing value should in-
crease 6
±
1
°
between 1200 and 1800 r/min. If the
pre-timing does not change between 1200–1800
r/min, overhaul or replace the injection timer.
It is important that the sensor distance to the flywheel/
flex plate is accurately set. This is done by screwing in
the sensor by hand to the flywheel/flex plate and then
by backing the sensor 1.5–2 turns and locking it with
the lock nut.
NOTE! Some flex plates either have a hole or a plate
riveted on that the sensor senses. If the flex plate has a
riveted-on plate, the engine must be cranked round so
that the plate comes opposite the hole where the sensor
should sit. It is then that the sensor distance must be
adjusted otherwise the plate will break up the sensor
when the engine starts.
