Thermostat
Replacing the thermostat
Note:
On MD2030 the thermostat is accessible after the
circulation pump has been removed. See under head-
i
ng "Replacing the circulation pump" on page 66.
Other engines:
1.
Remove both battery leads. Drain off the water in
the fresh water system.
2.
MD2O10, MD2020: Drain off the water in the sea
water system. Remove the alternator.
M D2040
1
M D2030
Fig.110. Positioning of the thermostat
1.
Cover
Cooling system
MD2O10-2020
MD2O10, MD2020: Release the exhaust pipe and
remove the heat exchanger housing complete. Re-
move the spring and lift out the thermostat from the
housing.
MD2040: Remove the cover (1) on the front left-
hand side of the heat exchanger. Remove the rub-
ber ring.
Checking the thermostat
1.
Check that the thermostat closes completely.
2.
Heat up water in a vessel to 68°C 1 154.4°F
(
MD2O10, MD2020), or to 75°C / 167°F (MD2030,
MD2040).
3.
Submerge the thermostat in the water. Check after
at least 3-5 minutes that the thermostat is still
closed.
4.
Raise the temperature to boiling point (100°C /
212°F). Check after 3-5 minutes that the thermo-
stat has opened at least 6 mm /.02362 in
(
MD2O10, MD2020), or to 8 mm /.3149 in
(
MD2030, MD2040).
Replace the thermostat if these specifications are not
met. NOTE! If the thermostat does not close completely
the engine will run at too low a temperature.
6 7
Fig. 109. Replacing the pump wheel
2.
Pull and twist out the pump wheel (impeller) with a
pair of universal pliers.
3.
Clean the housing internally. Grease in the pump
housing and inside of the cover with a little grease.
4.
Press in the new wheel with a rotational motion
3.
(clockwise). Fit the sealing washer on the outer
end of the centre of the wheel.
5.
Fit the cover together with a new gasket.
4.
6.
Open the bottom cock, or the cock on the S-drive.
Start the engine and check that no leakage occurs.
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