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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. Please refer to
image 54.
2. Withdraw the rubber impeller from its drive shaft
as shown. Please refer to image 55. Pliers may be
required.
54
Sea water pump location:
BetaSet-BetaGen 7, 10 & 12
Mid engine, starboard side, when viewed from the AC
alternator end.
BetaSet-BetaGen 14, 26 & 33
Forward end, port side, when viewed from the AC
alternator end.
BetaSet-BetaGen 40, 49, 40T IIIA & 49T IIIA
Forward end, starboard side, when viewed from the AC
alternator end.
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 back into position.
4. If refitting the exisiting impeller make sure it's blades
are facing in the same direction as they were before
the impeller was removed.
NB: If any pieces of rubber impeller are missing then they
must be located as they are most likely to be trapped
in the entrance to, or within the heat exchanger cooling
stack.
5. Run the engine up to temperature and check for leaks.
55
BetaSet-BetaGen 4/2, 6/2 & 11/2
Forward end, starboard side, when viewed from the AC
alternator end.
BetaSet-BetaGen 22/2 & 25/2
Forward end, starboard side, when viewed from the AC
alternator end.
70
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