FNM HPE 300 Owner's Manual page 62

Marine Diesel Engines
Winter storage:. coolant circuits care .
After flushing the circuits and after circulated fresh water in the cooling circuit (sea water circulation side),
to avoid freezing during long rest of the engine in cold weather conditions, we recommend to:
1. Close the sea water tap
2. Open the sea water filter cap
3. Insert the antifreeze liquid (antifreeze mixture) in the filter and put the engine to minimum rpm to
facilitate the antifreeze additive aspiration in the cooling circuits up to overboard discharge.
**In the case of applications with stern drive follow the same operation using the casings on the
suction intakes of the stern drive and sucking from a tank containing the antifreeze mixture.
The coolant fluid is polluting, use appropriate precautions to avoid releasing it into rivers or
the sea.
The sea water freezing in the cooling circuit, causes damage to the circuit itself.
Winter use
Use during the winter in areas where temperatures are very cold.
1. To avoid the circuits freezing when the engine remain unused for short periods. To drain the
circuit:
2. Close the sea water tap.
3. Unscrew the zinc anodes on the cover of the water / water exchanger and on the intercooler cover.
Facilitate the escape of water from the circuit by unscrewing also the anode on the cover of the
exhaust manifold.
Clean the water/water heat exchanger tube bundle
1. Stop the engine and close the sea water circuit inlet valve .
2. Drain the sea water circuit as mentioned above.
3. Drain the coolant circuit and remove the coolant pipes.
4. Remove the water/water heat exchanger from its support (there are 4 M8 screws at the bottom)
5. Remove the caps of the exchanger (one nut on threaded bolt M16)
ENG rel. 1/11
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WNER S ANUAL
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Engine maintenance
HPE300
68