Beta Marine Beta 28 Operator's Maintenance Manual page 47

Problem: Water in lubricating oil - general
Possible Cause
Core plug pushed out due to frozen block:
Water pump seal damaged:
Problem: Water in lubricating oil - heat exchanger cooled
Possible Cause
Oil goes "milky" due to seawater entering exhaust manifold:
Problem: Water in lubricating oil - keel cooled
Possible Cause
Oil goes "milky" due to water entering exhaust
manifold and then into the sump:
Problem: Engine overheats
Possible Cause
Check coolant level:
Pressure cap loose:
Switch sender faulty:
Insufficient restrictions in pipe to calorifier:
High exhaust back pressure:
Keel cooler insufficient size:
Problem: Engine overheats - Heat exchanger 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 57 litres / minute minimum at 1,500 rpm as follows:
(a) With the boat tied up and out of gear run the engine up to 1500 rpm. Hold a plastic bucket over the 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 noticeably less than the 57 litre per minute
minimum at 1,500 rpm, 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 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.
Solution
Service Agent to check and replace.
Service Agent to check and replace.
Solution
Check installation - has anti-siphon valve been fitted?
Change engine oil and run engine for 10 minutes
each time to eliminate any water. Get fuel injection
pump and compression checked by Service Agent.
Solution
Check installation - has dry exhaust system been
fitted correctly, and ensuring rain water cannot enter
the exhaust port and run back? (See Dry Exhaust
System).Change engine oil and run engine for
10 minutes each time to eliminate any water.
Get injection pump checked by Service Agent.
Solution
Top up.
Tighten correctly or replace.
Replace.
Clamp off pipe to confirm.
Must not exceed:
60 mm of Hg (2.4" of Hg) @ 2,600rpm.
Contact boat builder
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