Cooling System; Closed Coolant Circuit; Seawater Circuit; Hot Water Connection - Nanni T4.155 Workshop Manual

DANGER: Do not smoke or bring a flame or sparks close to fuel.
Always wipe up spilled fuel.

COOLING SYSTEM

The system comprises two different circuits: the closed coolant circuit and the seawater circuit.

Closed coolant circuit

This circuit comprises a pump controlled by the crankshaft by means of two V belts, a water temperature exchanger,
an oil temperature exchanger integrated in the block and a thermostat.

Seawater circuit

The circuit comprises a pump, a fresh water-sea water temperature exchanger, a super-charger air coolant, a fuel
coolant (for 4.390 TDI), a reverser oil exchanger and an exhaust elbow.
Coolant
Recommendations for first start-up:
- Check torque of the drain plug located under the turbo charger. Open the vent cap located on the top of
the turbo charger volute.
- Prepare a permanent antifreeze mixture with 50% antifreeze and 50% fresh water. The quantity required
is in the technical data table.
Pour the mixture in the filling port. Close the vent cap on the top of the turbo charger when the mixture is visible.
Continue filling to maximum level. Future top-ups, if necessary, will be made with fresh water only, engine cold. Start
the engine and top up the level. Verify that there are no leaks.
Every two years, at the beginning of the navigation season, fully drain the cooling system, clean with fresh water and
fill again according to the previous instructions (Refer to SILVERWAKE guarantee conditions).
DANGER: Top up with coolant, engine stopped and cold. Do not smoke or bring a flame close by.
Keep away from rotating devices when the engine is running.
CAUTION: Never add pure antifreeze. Use of additives or other types of coolant may cause the
formation of insulating deposits and engine overheating.

Hot water connection

An installation can be connected to the engine for on-board water heating by a derivation of the internal soft water
circuit (refer to your NANNIDIESEL agent).
Seawater filter
A water filter must be adapted between the pump and the seawater intake. Verify and clean this filter on a regular
basis.
CAUTION: Before starting the engine, verify that the seawater intake is open, as dry operation for even a few
seconds can damage the rotor of the water pump.
After cleaning the seawater filter, carefully close the cover to prevent the water pump from sucking in air.
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