Beta Marine BV1305 Operation And Maintenance Manual page 20

GENERAL -HEAT EXCHANGE ONLY:
The most common cause of
overheating is insufficient seawater
flow due to a blocked intake (weed
or a plastic bag!). If this happens
then clear the blockage. If the
problem is not cured then check the
system for sea water flow which
should be 6.5 litres / minute
minimum at 1,000 rpm as follows:
(a) With the boat tied up and out of
gear run the engine up to 1000 rpm.
*Hold a plastic bucket over the
PROBLEM: KNOCKING NOISE
Possible Cause
Propshaft touching gearbox output
coupling through split boss or Type 16
coupling:
Flexible mount stud touching engine
bed:
Drive plate broken:
Engine touching engine bed:
PROBLEM: BATTERY QUICKLY DISCHARGES
Possible Cause
High load and insufficient running:
Low electrolyte level:
Fan belt slipping - black dust in
engine compartment: Engine
compartment temperature too high:
Alternator defective:
Battery defective:
Poor wiring connection:
exhaust outlet for 10 seconds and
measure the amount of water
collected. Multiply this value by 6 to
give the flow in litres/min. Repeat
twice and take an average. If the flow
rate is noticably less than the 6.5
litre per minute minimum, then:
(b) Check impeller in sea water
pump - if worn replace.
(c) If impeller has a vane missing
then this will be lodged either in the
Solution
Adjust, giving correct clearance (10mm) between gearbox and propeller shaft.
Adjust stud to clear.
Replace / repair.
Re-align engine / modify bed.
Solution
Reduce load or increase charging time. Large domestic battery banks subject
to high electrical loads will take a considerable time to recharge from a single
alternator.
Top up.
Adjust tension / replace belt with a high temperature and/or improve engine
compartment ventilation.
Check with Agent.
Replace.
Check wiring system.
pipe to the heat exchanger or in the
end of the exchanger. This must be
removed.
(d) Check flow again as in (a).
*Note: This operation must only be
done in safe conditions, in port and
with two assistants.
Working from a rubber dinghy is
best. The person holding the bucket
should take precautions against
breathing in the exhaust gasses.