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32, CHECKING HEAT EXCHANGER
An apparent failure in the cooling water supply (rising engine temperature) that
cao not be attributed either to a faulty impeller or to air in the pump or associated
, piping, may be due to an end aperture blockage in the tube cooler.
Checking:
1. Oose the gate valve. Open drain cock (1)
to drain sea water from the tube cooler.
2. Remove suction hose and end cover (3).
Remove any waste material (grass etc) that 2
may he blocking the cooler end aperatures
and preventing effective flow through the
cooler.
3. Re-assemble in reverse order.
6 5 4 3 1
I Checking tube cooler: Fig. 46
i If the level falls abnormally, the tube cooler
should be checked. Remove the entire heat
l exchanger.
i 4. Remove the covers (3) and gaskets (4) from both ends of the heat exchanger.
5. Place a piece of wood over ODe end of the tube cooler (5) and tap carefully to
remove cooler from its housing ( 6).
6. Insert replacement cooler, fit end covers and re-connect hoses. Top up engine
fresh water cooting system.
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