Coolant; Anti-Freeze; Volume; Anti-Corrosion Additives - Volvo Penta TAD1630G Workshop Manual

Service procedures - cooling system

Coolant

The coolant should be a mixture of anti-freeze additive and
water or, where there is no risk of freezing, anti-corrosion
additive and water, see below.
The coolant should be replaced and the system flushed
clean once a year. At the same time check all hoses and
connections and fix any leakage. Replace all loose, swollen
or otherwise damaged hoses.

Anti-freeze

The anti-freeze prevents corrosion in the cooling system and
also freezing during the winter. We recommend using 50%
Volvo Penta anti-freeze* (ethylene glycol, bluegreen) and
50% pure water (as neutral as possible). This coolant mix-
ture gives protection against freezing down to about –
40°C (–40°F) and should be used year-round.
For lower temperatures a greater quantity of anti- freeze is
required according to the table below.
Notice: To get full protection against corrosion, always use
at least 40% anti- freeze. This means that topping-up, when-
ever necessary, should be done with the corresponding anti-
freeze mixture.
Note: Volvo Penta anti-freeze must not be mixed with any
other kind of anti-freeze.
Part No. 1141646-8: 5 liters (1.3 US gals).
Part No. 1141647-6: 210 liters (55.5 US gals).
Mixing table, antifreeze/water
Portion as a percentage of antifreeze of total coolant
volume for freeze protection down to about:
–28°C (–18°F) –40°C (–40°F)
40 % 50 %
At the most, the freezing point can be lowered to -56°C (-
69°F) (60% anti-freeze). Increasing the mixture of anti-
freeze past this point reduces the protection from freez-
ing.
Mix the anti-freeze with water in a separate container prior to
filling the cooling system.
WARNING! Anti-freeze is harmful to health (poison-
ous if consumed).

Anti-corrosion additives

The easiest way to prevent corrosion is to use a suitable
mixture of genuine Volvo Penta anti-freeze (glycol) all year
round (at least 40%).
When there is never any danger of freezing, and if a water/
glycol mixture is not used year-round, use water with Volvo
Penta anti-corrosion additives (Part No. 1141526-2). Anti-
corrosion additive is available in quantities of 1/2 liter. Mixing
ratio 1:30.
144
–56°C (–69°F)
60 %
Clean the cooling system thoroughly before filling. Run
the engine warm immediately after filling to get the best
possible effect from the additive.
To maintain the protection against corrosion, the coolant
should thereafter be supplemented with further 1/2 liter anti-
corrosion additive every 400th hour of operation.
Note: Other types of anti-corrosion additive, glycol or anti-
freeze must absolutely not be mixed with this anti-corrosion
additive. The anti-corrosion additive does not prevent the for-
mation of ice and should only by used where the temperature
is always above 0°C (32°F).
WARNING! Anti-corrosive agents are harmful to
health (poisonous if consumed). See warnings regard-
ing filling coolant, next page!

Checking coolant level

The level should be about 4-5 cm (2") below the filler cap's
sealing edge. There must be an air space to allow for expan-
sion of the coolant.
WARNING! Do NOT open the pressure cap (bleed
cock) when the engine is hot. Steam or hot coolant
can spray out and the system pressure will be lost.
An insufficient quantity of coolant can lead to poor circula-
tion, which increases the risk of overheating, resulting in
damage to the engine.
Note: Daily check of the coolant level or topping up through
the fill opening is allowed only when the engine is stopped
and cold.

Draining the coolant

Before draining the coolant, stop the engine, unscrew the fill-
er cap.
Check carefully to make sure that all the water is drained.
Draining points:
– Radiator
– Engine block, right side
– Coolant pump
– Oil cooler, engine
– Charge air cooler (TWD1630)
Group 22