
ALPHA series engines worksHoP mAnuAL
19
2.13.1 removing a fuel Pump
To retain the governor setting leave one fuel pump
in position.
1. Isolate the fuel supply.
2. Using a pair of pliers, squeeze the tails of
the flexible fuel pipe clip (A) at the pump end
together sufficiently to enable the clip to be
moved sideways along the pipe.
Figure 2.13.1 Fuel Pump
3. Pull the pipe off of the fuel pump.
4. Turn the engine control anti clockwise to the stop
position.
5. Remove the fuel pump clamp (B).
6. Lift out the fuel pump.
CAution
If more than one fuel pump is being removed
extreme care must be taken to ensure that the
shim pack is kept with the relevant pump and
cylinder.
wArning
Under no circumstances must any attempt be
made to remove the fuel pump tappet stud from
the crankcase. The shims fitted between the
steel plate and the fuel pump flange must not
be removed or added to.
2.13.2 servicing the fuel Pump
No attempt to dismantle the fuel pump, other than
to replace the delivery valve, must be made.
Whenever the delivery valve holder is removed a
new joint must be fitted before it is reassembled and
the holder torqued to 47.0Nm (35.0lbf ft).
2.13.3 Refitting a Fuel Pump
Before refitting a fuel pump, the governor must be
correctly adjusted. If it has been removed or is known
to be out of adjustment, refer to "2.53 Setting the
Governor".
If the fuel pump tappet has been removed it must
be replaced with the longer slot (A) facing outwards.
This will ensure it is correctly located over the end of
stud (B) which is fitted inside the crankcase.
Figure 2.13.3 Fuel Pump Tappet and Stud
The tappet can be placed into the crankcase with
the aid of long-nosed pliers held open against the
top inside edge of the tappet recess.
1. Hold the engine control in the stop position.
2. Press down on the top of the fuel pump tappet,
and slowly turn the crankshaft until the fuel pump
tappet is felt to be at its lowest position.
3. Using the fuel pump rack setting gauge, 317-
50114, clamp the pump rack (C) with the end
protruding 55.5mm (2.18in) from the crankcase
end face (D).
Figure 2.13.3 Setting the Rack - 317 -50114 - Lister Service Tool
4. Replace the correct original shim pack to the fuel
pump.
5. Gently insert the fuel pump, and shims into the
crankcase taking care to ensure that the fuel pump
rack engages with the slot in the governor rack.
6. Carefully turn the fuel pump anti clockwise until
the pump rack is felt against the stop.
Hold the pump in this position, and replace the fuel
pump clamp with the bevelled face of the nut towards
the clamp finger tight. Take care to ensure the pump
does not move.
CAution
It is possible that the engine will not stop when
required if the pump is not turned anti clockwise
before tightening down or it moves before, or
while, being tightened.
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