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N40469 Chapter 5
Page 31
How to check the drive belt of the
alternator
Warning! The engines have a guard fitted to give
protection from the alternator fan and the drive belt.
Ensure that this guard is fitted before the engine is
started.
Note: The engine may have the ability to auto start.
Ensure that the power supply is isolated before any
service or repair is performed.
To maximize the engine performance, inspect the belt
for wear and for cracking. Replace a belt that is worn
or damaged.
If the belt is too loose, vibration causes unnecessary
wear on the belt and the pulley.
1.
Undo the bolts (figure 9 item 1) and remove the
guard (figure 9 item 2). After inspection of the belt
or adjustment of the belt, refit the guard.
2. To accurately check the belt tension, use a belt
tension gauge. Install the gauge (figure 10 item 1)
at the centre of the longest free length and check
the tension.
3. The correct tension for a used belt is 355N (79.8
lb). If the tension of the belt is below 250N (56 lb)
adjust the belt to 355N (79.8 lb).
4. The correct tension for a new belt or new belts
is 535N (120 lb). A higher tension is required in
order to compensate for the stretch that is in a
new belt. Only use the higher tension on a belt
that has not been used. A used belt is a belt that
has been in operation for 30 minutes or a longer
period of time.
5. Alternatively if a tension gauge is not available a
useable option is to use moderate thumb pressure
at the centre of the longest free length and the
correct tension will be 10mm.
6. Align the guard to the engine. Install the bolts and
tighten securely.
Figure 10
figure 9