Perkins 4GM - How to Renew an Atomiser

TPD1327E Chapter 4
Page 29
How to renew an atomiser
Cautions:
• Atomisers must be removed and tted by a person
with the correct training.
• Do not allow dirt to enter the fuel system. Before a
connection is disconnected, clean thoroughly the
area around the connection. After a component
has been disconnected, t a suitable cover to all
open connections.
1. Remove the fuel leak-off pipe.
2. Remove the union nuts (A1) of the high-pressure
pipe from the atomiser and from the fuel injection
pump. Do not bend the pipe. If necessary,
remove the pipe clamps.
3. Remove the atomiser setscrews and remove
the clamp (A2), the atomiser (A6) and its seat
washer (A7). Remove the dust seal (A5) and the
spacer (A4) and t the spacer and a new dust
seal onto the new atomiser.
Caution: Remove and discard the seat washer (A7).
If the original seat washer remains in the recess for
the atomiser, the nozzle protrusion will be incorrect
when a new seat washer is added.
4. Put the new atomiser in position with its spacer,
new dust seal and a new seat washer, ensure
that the fuel leak-off connection (A3) is not
toward the engine. Position the clamp and
engage the atomiser setscrews. Ensure that the
atomiser is not tilted and tighten the setscrews
for the clamp evenly and gradually to 12 Nm (9
lbf ft) 1,2 kgf m.
Caution: Do not tighten the union nuts of the high-
pressure pipes more than the recommended torque
tension. If there is a leakage from the union nut,
ensure that the pipe is correctly aligned with the
atomiser inlet. Do not tighten the atomiser union nut
more, as this can cause a restriction at the end of
the pipe. This can affect the fuel delivery.
5. Fit the high-pressure fuel pipe and tighten the
union nuts to 22 Nm (16 lbf ft) 2,2 kgf m. If
necessary, t the pipe clamps.
6. Renew the sealing washers and t the leak-off
pipe. Tighten the banjo bolt to 9,5 Nm (7,0 lbf ft)
1,0 kgf m.
7. Operate the engine and check for leakage of fuel
and air.