Cooling System, Cleaning - Volvo Penta TWD1643GE Series Operator's Manual

47711296 01-2019 © AB VOLVO PENTA

Cooling System, Cleaning

WARNING!
All coolant is hazardous and harmful to the
environment. Do not consume. Coolant is flammable.
IMPORTANT:
Never clean the cooling system if there is any risk of
freezing, since the cleaning solution does not have any
antifreeze properties.
IMPORTANT:
It is extremely important that the correct concentration
and volume of coolant is added to the system.
Mix in a separate clean vessel before filling the cooling
system. Make sure that the liquids mix.
IMPORTANT:
Always follow local safety instructions and regulations.
Cooling performance is reduced by deposits in the
radiator and cooling galleries. The cooling system
should be cleaned out when the coolant is changed.
1 Empty the cooling system. Refer to Coolant,
Draining, page 80.
2 Put a hose into the expansion tank filling hole and
flush with clean water, as specified by Volvo Penta–
refer to section Water quality in Technical
Data, page 95 until the water draining out is
completely clear.
3 If there should still be some contamination left after
flushing for a long time, cleaning can be done with
coolant. Otherwise, continue as in item 8 below.
4 Fill the cooling system with 15-20 % mixture of
concentrated coolant. Use only Volvo Penta
recommended concentrated coolant mixed with
clean water.
5 Drain the coolant after 1-2 days of operation.
Remove the filler cap and possibly the lower
radiator hose to increase the speed of emptying.
To prevent suspended material from settling back
in the system emptying should be done rapidly,
within the space of 10 minutes, when the engine
has not been standing still for a long time.
6 Flush the system immediately and thoroughly with
clean hot water to prevent dirt from settling in the
inner areas. Flush until the water that runs out is
completely clean. Make sure that any heater
controls are set to full heating during emptying.
7 If contamination should still be left after a long
period of flushing, cleanout using Volvo Penta
radiator cleaner, followed by finishing-off with Volvo
Penta neutralizer. Carefully follow the instructions
on the package. Otherwise, continue as in item 8
below.
8 When the cooling system is completely free from
contamination, close the drain taps and plugs.
Maintenance
81