–
Preparations:
– Detach the enclosure hood and side
panel; see M 35.00.
– On 2-cylinder engines, detach the oil fil-
ler pipe.
Dismantling:
– Remove the screws for the extra-fuel
device and take it off; see Fig. 106.
Dismantling the hydraulic extra-fuel
device:
– Take off the circlip (106/1), unscrew the
threaded pin (106/2) and push out cylin-
der (107/1).
– Take off the circlip (107/2) and pull out
the end cover (107/3) and the piston
(107/4) with spring (107/5).
– Take out circlip (107/6) with spring plate
(107/7), spring (107/8) and ball (107/9).
Inspection / repair:
– Inspect the piston and cylinder of the
extra-fuel device for score-marks or
worn areas.
– Check the ball seat of the pressure
relief valve for wear marks.
– Renew the O-ring seals.
Assembling the hydraulic extra-fuel
device:
– Assembly is as shown in Fig. 107,
working in the reverse order of
dismantling.
3
L / M . . 09.96
106
107
M 12.00 Extra-fuel device
M 12.10 with injection pump PFR 1K 80
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