Zanotti un0 010, Workshop Manual, Page: 99 / 248

88
Diesel Engine
4.1 Belts
Tightening Information
This diesel engine service belt system, provides belt tightening by split pulleys. As shown in Figure 5.1.1 Split pulley shoulders
force belt in position, as pulley V narrows, belt goes further from fulcrum becoming tighter, while as V widens, belt runs closer
slacking.
Belt Unit
Inner
Spacers
Tightening
Tension
Operating
Tension
(u)
Water
pump
UN0060 - UN0080 4 83Hz 79Hz
UN0100 - UN0120 5 88Hz 76Hz
(v)
Alternator
UN0060 - UN0080
UN0100 - UN0120
2 124Hz 113Hz
Belt tightening is achieved changing number of spacers between the two halves. Consider that:
-
The number of inner spacer in the table applies to a new belt
-
After you tighten the belt, it need to adapt to its seat, therefore after few running minutes check the if tension settle
to the value reported in the last column of the table
(a)
(b)