35
BELT TENSION
{
WARNING!
Belt tension must only be checked with the engine
switched off.
BATTERY CHARGING ALTERNATOR
These engines are fitted as standard with a ’polyvee’ flat
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. Please refer
to image 33.
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. Please
refer to image 34.
5. Belt tension should be regularly checked especially
during the first 20 hours of running in a new belt, as
stretching occurs.
SECONDARY DOMESTIC BATTERY CHARGING ALTERNATOR
The same method applies as outlined above when an engine is fitted with a secondary domestic battery bank alternator
and/or travel power.
Secondary Alternator Set Up Beta 30 – Beta 115 Optional Travel Power Set Up Beta 35 - Beta 115
IMPORTANT! Tension drive belts by
hand only, do not over tension.
33
Adjuster bolt
34
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