Belt Tensioning Adjustment - Beta Marine Beta 10 Operator's Maintenance Manual

BELT TENSION
WARNING!
Belt tension must only be checked with the engine
switched off.
40 AMP ALTERNATOR (HEAT EXCHANGER COOLED)
These engines are fitted as standard with a single belt that
drives both the 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
51.
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
down firmly by thumb. Tighten support bolts. See
photo 52.
5. Belt tension should be regularly checked especially
during the first 20 hours of running in a new belt, as
stretching occurs.
LARGER 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.
1
/ " or 12 mm when pushed
2
51
Adjuster bolt
52
41