Belt Tensioning; Air Filter - Beta Marine BV1903 Operator's Maintenance Manual

BELT TENSION
65 AMP ALTERNATOR (Heat Exchanger Cooled)
WARNING
Belt tension must only be checked with the engine switched off.
(1) On heat exchanger cooled engines a single 65 amp is fitted as standard.
This alternator is adjusted as follows.
(2) The belt tension is adjusted by swinging the alternator outboard as it
pivots on its support bolts.
(3) With the engine stopped, loosen the support bolts and the link adjusting
bolt.
(4) Push alternator outboard to tension and tighten link bolt. Check that the
depression of the belt at position shown is approximately
when pushed down firmly by thumb. Tighten support bolts.
(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, but final tensioning must be by
hand only. Over tensioning will cause premature failure of components.
AIR INTAKE FILTER
These engines are fitted with an air intake filter which should be checked every season and changed every 2 years
or sooner if badly clogged. If badly clogged check more often
1
ADJUSTING
BOLTS
1 / " or 12 mm
2
2
11
3