3.152 Series » Atomiser fault

An atomiser fault can cause an engine misfire.

In order to find which atomiser is detective, operate the engine at a fast idle speed. Loosen and tighten the union nut of the high-pressure fuel pipe at each atomiser. When thé union nut of the detective atomiser is loosened, it has little or no effect on the engine speed.

Warning! Ensure that the fuel does not spray onto your skin. Keep away from moving parts during engine operation. Some moving parts canner, be seen clearly while the engine runs.

How to renew an atomiser

Caution: 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, fit a suitable cover to all open connections.

1. Remove the fuel leak-off pipe.
2. Remove the union nuls 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 flange nuts and remove the atomiser and its seat washer. Remove the dust seal and the spacer and fit îhe spacer and a new dust seal on the new atomiser.
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 is not toward the engine. Ensure that the atomiser is not tilted and tighten the flange nuts evenly and gradually to 16 Nm (12 Ibf ft) 1.7 kgf m. if the atomiser is retained by a separate clamp. Tighten the nuts 1o 12 Nm (9lbffl) 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 Ibf ft) 2,2 kgf m. H necessary, fit the pipe clamps.
6. Renew the aluminum washers and fit the Ieak-off pipe.
7. Operate the engine and check for leakage of fuel and air.