42
Ancillary belt replacement
NEF45 SM1F
Only proceed when the engine is not turning and is at low
temperature so as not to run the risk of burns.
Remove the protective grilles and the fan together with the spacer
by undoing the relative fasteners.
Loosen the bolt (1) anchoring the alternator to its lower support
and the screw (2) fastening the alternator to the bracket.
Unscrew the adjustment screw (4) to loosen and remove the
auxiliary assembly belt (3).
Fit the new ancillary belt inside the shoulders of all the pulleys, in
the following order: damper, guide pulley, fan control pulley,
alternator, water pump.
Set the tension of the new ancillary belt by turning the adjustment
screw (4), then tighten the relative lock nut. For engines without a
screw tensioner it is necessary to rotate the alternator in order to
obtain the prescribed tension.
Tighten the screw (2) fastening the alternator to the bracket and
the bolt (1) anchoring the alternator to its lower support to a
torque of 43 ±6 Nm.
Fully rotate the crankshaft twice to ensure that the new ancillary
belt has been correctly fitted.
Use the appropriate tool to check the tension of the new ancillary
belt at the intermediate point of the branch between the guide
pulley and the fan control pulley. The correct tension must
correspond to 245 ±10 Hz (1,200 ±100 N).
Repeat the aforesaid procedure if necessary.
Reposition the fan, together with spacer, in its seat and the
protective grilles and tighten the relative fasteners.
Replace the ancillary belt if it shows signs of abrasions,
cracks or tears or if it is soiled with oil or fuel.
ATTENTION!
When the engine is off, but still hot, the belt may
start to move without warning. Wait for the engine
temperature to decrease to prevent serious danger
of an accident.
13_076_N
