Volvo Penta TAMD71B Instruction Manual page 52

10.5.4 Checking the radiator and
charge air cooler (CAC)
Should higher than normal temperatures be ob-
served, the passage of air through the charge air
cooler and radiator must always be checked.
Check that the external cooling sections of the
radiator and the charge air cooler are not
blocked by insects or other impurities that can
restrict the air flow. If obstructions are found use
a mild greasedissolving detergent and water.
Never use water at high pressure or com-
pressed air.
Straighten out any bent cells in the cellsystem.
Flush both radiators individually from front. In
cases of more serious blockage the radiator/
charge air cooler must be removed entirely and
then cleaned with a mild detergent.
Also check that the fan cover and, if fitted, the
sealing strip fitted between the fan cover and the
charge air cooler has not come loose or is leak-
ing in any other way.
10.5.5 Replacing the raw water
pump impeller
Close the water inlet before working on
cooling system.
1. Remove the pump's end cover. Pull and twist
out the pump impeller using pliers.
2. Clean inside the housing. Lubricate the
pump housing and the inside of the cover
with a little lubricating grease.
3. Push in the new impeller with a rotating
movement counterclockwise.
4. Reinstall the cover together with a new gas-
ket.
Always keep a spare pump impeller and gas-
ket on board.
5. Open the water inlet. Start the engine and
check for leaks.
50 AB Volvo Penta / Diesel Engine TAMD71B
Fig. 10.9 Radiator and charge air cooler
Fig. 10.10 Removing the raw water pump impeller