Freshwater System - Volvo Penta D1-20 Operator's Manual

Freshwater system

The fresh water system is the engines' internal cooling system, which ensures that the engine operates at the cor-
rect temperature. It is a closed circuit system and must always be filled with a mixture of at least 40 % concen-
trated coolant and 60 % water to protect against internal corrosion, cavitation and damage caused by freezing.
We recommend that you use "Volvo Penta Coolant, Ready Mixed", alternatively "Volvo Penta Coolant" (con-
centrated) mixed with pure water according to spec, see "Coolant. Mixture". Only coolant of this quality is suited
too and approved by Volvo Penta.
The coolant should contain ethylene glycol of a good quality with a suitable chemical consistency for an adequate
protection of the engine. Using anti-corrosion aditive exclusively is not permitted in Volvo Penta's engines. Never
use water by itself as coolant.
IMPORTANT! Coolant must be used all year round. This applies even if there is never any risk for frost , to
ensure that the engine has an adequate protection against corrosion.
Future warranty claims on the engine and additional equipment may be rejected if an unsuitable coolant has
been used or if the instructions concerning coolant mixing have not been followed.
NOTE: The anti-corrosive agents become less effective after a time, which means that the coolant must be re-
placed, see "Service schematic". The cooling system should be flushed out at the same time as the coolant is re-
placed, see "Cooling system. Flushing".
Maintenance: Freshwater system
"Volvo Penta Coolant" is a concentrated coolant
that is to be mixed with water. It has been developed
to function optimally with Volvo Penta's engines and
provides excellent protection against corrosion, cavi-
tation and frost damage.
"Volvo Penta Coolant, Ready Mixed" is a ready-
mixed coolant, 40% "Volvo Penta Coolant" and 60%
water. This concentration protects the engine against
corrosion, cavitation damage and freezing conditions
down to -28 °C (18°F).
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