Beta Marine Beta 10 Operator's Maintenance Manual page 41

SEA WATER PUMP AND COOLING SYSTEM
IMPORTANT!
Before working on the sea water system ensure that the
sea cock is in the off position!
1. It is very important that the correct sea water flow is
maintained to cool the closed circuit system of the
engine. The key component in this system is the sea
water pump impeller. This should be checked every
year by removing the circular plate. See photo 46.
2. Withdraw the rubber impeller from its drive shaft as
shown. See photo 47. Pliers may be required.
46
3. Check impeller for cracks in the rubber, excessive
wear or lost vanes. Replace with a new impeller as
necessary. A drop of washing up liquid on the
impeller will help to push it into position.
Note: If any pieces of rubber impeller are missing then
they must be found as they are most likely to be trapped
in the entrance to the heat exchanger cooling stack.
See 'Cleaning Tube Stack'.
4. Re-assemble using new 'O' rings. Do not over tighten
end cap bolts and make sure the tube stack is the
right way round for end cap location.
5. Re-fill engine with coolant (water/anti-freeze solution)
and run engine up to temperature to check for leaks.
47
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