Suzuki GSX-R750, Service Manual

Page: 231 / 495

5-2 COOLING AND LUBRICATION SYSTEM
Gauge pressure
(kgf/cm 2 )
ENGINE COOLANT
At the time of manufacture, the cooling system is filled with a
50:50 mixture of distilled water and ethylene glycol anti-freeze.
This 50:50 mixture will provide the optimum corrosion protection
and excellent heat protection, and will protect the cooling system
from freezing at temperatures above –31°C (–24°F).
If the motorcycle is to be exposed to temperatures below –31°C
(–24°F), this mixing ratio should be increased up to 55% or 60%
according to the figure.
#
* Use a high quality ethylene glycol base anti-freeze,
mixed with distilled water. Do not mix an alcohol base
anti-freeze and different brands of anti-freeze.
* Do not put in more than 60% anti-freeze or less than
50%. (Refer to Right figure.)
* Do not use a radiator anti-leak additive.
50% Engine coolant including reserve tank capacity
Anti-freeze 1 200 ml (3.1/2.6 US/lmp. pt)
Water 1 200 ml (3.1/2.6 US/lmp. pt)
"
* You can be injured by scalding fluid or steam if you open the radiator cap when the engine is
hot. After the engine cools, wrap a thick cloth around cap and carefully remove the cap by
turning it a quarter turn to allow pressure to escape and then turn the cap all the way off.
* The engine must be cool before servicing the cooling system.
* Coolant is harmful;
• If it comes in contact with skin or eyes, flush with water.
• If swallowed accidentally, induce vomiting and call physician immediately.
• Keep it away from children.
Anti-freeze
Freezing point
density
50% –30°C (–24°F)
55% –40°C (–44°F)
60% –55°C (–67°F)
F
reezing point
(°F) (°C)
32 0
14 –10
–4 –20
–22 –30
–40 –40
–58 –50
–76 –60
–94 –70
20 40 60 80 100
Density (%)
Fig.1 Engine coolant density-freezing
point curve.
Boiling point
(°F) (°C)
302 150
284 140 1.5
266 130 0.9
248 120 0.5
230 110 0
212 100
0 10 20 30 40 50 60
Density (%)
Fig.2 Engine coolant density-boiling
point curve.