5 -28
(2) Replacing Engine fan belt
z Loosen the bolt(5) anchoring the alternator to its
lower support and the screw(3) fixing the
tensioning bracket(2) to the crankcase.
z Loosen the lock nut(1) and unscrew the
adjustment screw(7) on the tensioning bracket(2)
to loosen and remove the auxiliary members’
drive belt(4)
z Replace the worn belt(4) with new one.
z Ensure that all components of the pulleys and
guide rollers are clean and free from wear and
damage. If necessary, replace any components
that are worn or damaged.
z Ensure that the pulleys and guide rollers are free
from dirt and build up from the old belt.
z Fit the auxiliary members’ drive belt(4) inside the
shoulders of all the pulleys in the order:
crankshaft pulley, fan drive pulley, alternator,
water pump. Ensure the belt(4) is centered on all
pulleys.
z Proceed to tension the auxiliary members’ drive
belt(4) by screwing the adjusting screw(7) until
the tensioning bracket(2) has reached the full
extent position of the available adjustment, as
shown in the figure
z The correct value of statistical tension of the
auxiliary members’ drive belt(4) must be within
the range indicated in the table:
Statistical
tension
Measured
value
(N / rib / span)
Frequency
control (Hz)
Minimum 64 121
Rated 84 140
Maximum 104 158
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