Sea Water Pump, Heat Exchanger - Beta Marine Beta 10 Operator's Maintenance Manual

32
Rubber seal
(4) Drain off coolant into a bucket.
(5) Unscrew the 6 end cap retaining bolts using a 5 mm
Hex key (3 each end of the heat exchanger). Remove the
'O' rings and slide out tube stack. Carefully clean tube
stack and end caps.
(6) Re-assemble using new 'O' rings 212-07273.
Important: The tube stack can be fitted either way
Sea Water Pump and Cooling System
(Heat exchanger-cooled engines)
Caution: 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 34.
2) Withdraw the rubber impeller from its drive shaft as
shown. See photo 35.
34
Alignment marks
33
Horizontal line
(7) Re-fill engine with coolant (water / anti-freeze solution)
3) Check impeller for cracks in the rubber, excessive wear
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'.
35
24
Alignment marks
Horizontal line
around but must be aligned correctly with the horizontal
line and rubber seal between the alignment marks at the
exhaust end of the heat exchanger. (This ensures correct
coolant flow in the heat exchanger) Do not over tighten
end cap bolts.
and run engine up to temperature to check for leaks.
or lost vanes. Replace with a new impeller as necessary.
Tube stack