39
BELT TENSION
WARNING!
Belt tension must only be checked with the engine
switched off.
65 AMP ALTERNATOR (HEAT EXCHANGER COOLED)
These engines are fitted as standard with a single belt that
drives both the 65 Amp battery charging alternator and
the fresh water / engine coolant circulating pump.
1. The belt tension is adjusted by swinging the alternator
outboard as it pivots on its support bolts. See photo
49.
2. With the engine stopped, loosen the support bolts and
the link adjusting bolt.
3. Push alternator outboard by hand to tension the belt,
then tighten link bolt.
4. Check that the depression of the belt (at position
shown) is approximately
1
/
2
” or 12 mm when pushed
down firmly by thumb. Tighten support bolts. See
photo 31.
5. Belt tension should be regularly checked especially
during the first 20 hours of running in a new belt, as
stretching occurs.
100 AMP ALTERNATOR (OPTION)
The same method applies as outlined above with the
‘polyvee’ flat belt, but final tensioning must be by hand
only. Over tensioning will cause premature failure of
components.
49
50
Adjuster bolt
1640_Aug_2013.qxd:beta 1660 manual 18/11/13 10:48 Page 39
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