 Dodge
50 Series Workshop Manual
A440
Page 10
Note:
The rubber sealing ring is always fitted below the
rigid spacer.
I Tighten securing nuts evenly to 14 Ibf ft (1,9 kgf m) -
| 18 Nm. If a separate clamp is fitted, tighten to 9 Ibf ft
| (1,2 kgf m) 12 Nm.
Some engines are fitted with atomisers which use a top
inlet connection. These can be fitted with the atomiser
180° out of position. In this position, the nozzle holes
will not spray into the combustion chamber correctly
and will result in loss of power and increased smoke
emission. Atomisers with top inlet connections must
always be fitted with the leak off connection to the fuel
injection pump side.
Atomisers • should be taken out for examination at
regular intervals.
The first symptoms of atomiser troubles usually fall in
one or more of the following headings:-
1. Misfiring.
2. Knocking in one (or more) cylinders.
3. Engine overheating.
4. Loss of power.
5. Smoky exhaust (black).
6. Increased fuel consumption.
The particular faulty atomiser or atomisers may be
determined by releasing the pipe union nut on each
atomiser in turn, with the engine running at a fast "tick-
over". If after slackening a pipe union nut the engine
revolutions remain constant, this denotes a faulty
atomiser. The complete unit should be withdrawn from
the cylinder head and inverted, atomiser nozzle out-
wards and the unions retightened. After slackening the
unions of the other atomiser pipes (to avoid the
possibility of the engine starting), the engine should be
turned until the nozzle sprays into the air, when it will be
seen if the spray is in order. If the spray is unduly "wet"
or "streaky" or obviously to one side, or the nozzle "drib-
bles" it may only be necessary to probe the nozzle
holes to remove carbon.
NOTE: Care should be exercised to prevent the hands
or face from coming into contact with the spray, as the
working pressure will cause the fuel oil to penetrate the
skin.
NO ATTEMPT SHOULD BE MADE TO ADJUST THE
INJECTION PRESSURE WITHOUT A PROPER TESTING
PUMP AND PRESSURE GAUGE (FIG. N25) IT IS QUITE
IMPOSSIBLE TO ADJUST THE SETTING OF
ATOMISERS WITH ANY DEGREE OF ACCURACY
WITHOUT PROPER EQUIPMENT.
Perfect atomisers, when tested by pumping fuel
through it in the open air gives a short "pinging" sound
as the fuel emerges from the holes. After the atomiser
has been in service for some time, the "pinging"
changes to a crackling sound. It is not until the atomiser
sounds "dead" that its condition is likely to affect the
running of the engine.
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