Sea Water Pump; Thermostat; Replacing/Checking The Thermostat - Volvo Penta D2-55 Workshop Manual

D2-55 A/B
D2-55 C & D2-75
Replacing impeller in seawater
pump
Close the sea cock or the valve on the S-drive before
working on the cooling system.
1. Remove the end cover of the pump and drain the
2. Pull and twist out the impeller with water-pump
3. Clean inside the housing. Grease the pump hous-
4. Push in the new impeller with a twisting motion
5. Install the cover with a new gasket.
6. Open the sea cock, or tap on the S-drive. Start

Thermostat

Replacing the thermostat
1. Turn the main switch off. Drain the water from the
3
2. Remove the cover (1), the spacer (2) and lift out
2
1
Checking the thermostat
1. Check that the thermostat closes completely.
2. Heat up water in a container to 75
3. Lower the thermostat into the water. Check that
4. Raise the temperature to boiling point (100
3
1
NOTE! If the thermostat does not close completely,
the engine will run too cold.
water from the seawater system.
piers.
ing and the inside of the cover with a little water-
resistant grease intended for rubber.
(clockwise). Install the sealing washer at the outer
end of the impeller center.
the engine and check carefully that no leakage
occurs.
freshwater system.
the thermostat (3). Remove the rubber ring.
the thermostat is still closed after 3-5 minutes.
Check that the thermostat has opened at least
8 mm after 3-5 minutes. Replace the thermostat if
it does not fulfill the requirements.
Group 26 Cooling system
o C .
o C).
73