FNM HPE Series Owner's Manual page 97

3.3.15 Cleaning the tube bundles
Periodic maintenance: performed by qualified personnel equipped with appropriate work tools
and adequate means of protection.
Your marine engine is equipped with a different tube bundle exchangers for cooling different fluid
circuits and improve overall performance.
Each of these must be thoroughly cleaned to prevent incrustations that after long time can block the
fluid flow and lead to engine damage.
3.3.15.1 Cleaning the tube bundle of the water to water exchanger
To clean the tube bundle follow these indications:
1. Stop the engine and close the sea water circuit inlet valve.
2. Drain the sea water circuit as described in Section 3.3.13 - Sea water circuit cleaning - on page
87.
3. Drain the coolant from the circuit and disassemble the pipes.
4. Remove the water to water exchanger from its support (see the paragraph 1.6 - Main
components of FNM
5. Dismount the covers of the exchanger.
6. Take care of the seal gaskets, respect their integrity. In any case, replace them if damaged.
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FNM HPE Series
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engine, HPE Series – on page 15 to identify the heat exchanger).
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