ENGLISH
36
Cooling system
Coolant is circulated by a water pump located in the engine. When the
engine is cold the cooling liquid circulates only through the cylinder and the
cylinder head. After the engine has reached its operating temperature (about
70°C, 158°F), the thermostat opens and the cooling liquid is also pumped
through both aluminum radiators.
Air blowing in through the radiators cools the cooling liquid. The slower the
speed of the motorcycle, the less the cooling liquid is cooled down. Dirty
radiator fins also reduce the cooling efficiency.
If little or no air blows through the radiators, for example when riding
through slow traffic or waiting at traffic lights, the coolant temperature will
rise. If the coolant temperature rises to 98°C (208,4°F), the fan
1
on the left
radiator will switch on. This fan will provide additional air circulation through
the radiator thereby preventing the cooling system from overheating.
!
CAUTION
!
The red cooling liquid temperature warning light
2
will begin to light up, if
the cooling liquid temperature reaches approx. 120°C (248°F) and
henceforth has exceeded its normal operating temperature.
Possible causes:
– riding slowly with a large load at a higher air temperature:
If possible increase your running speed, so that more air can blow
through the radiators. Should the warning light still be on off after 300
meters, stop immediately, switch off the engine and look for other
possible causes.
– Too little cooling liquid in the system:
Let the engine cool down, and check the system for leakage’s. Also
examine the cooling liquid level CAUTION SCALDING HAZARD! Do not
drive on, until there is sufficient liquid in the cooling system. Go to your
nearest KTM garage and get it seen to. If you drive with the cooling
liquid temperature warning light on, you will cause even more damages
to the engine.
– The cooling fan on the left cooler is not working:
The cooling fan must be running, when the cooling liquid temperature is
98°C (208,4°F) and the ignition is on. If the fan is not working, and
there appears to be sufficient cooling liquid, the only thing you can do is
to drive on to your nearest KTM garage at the least possible engine load.
– Continuous use of the clutch (riding the clutch) at lower speeds.
A mixture of 60% antifreezer and 40% water is used as cooling liquid.
How-ever, the anti-freeze protection must be at least -25° C (-13° F). Aside
from antifreezing protection, this mixture also provides great corrosion
protection which is why it must not be replaced by pure water.
!
CAUTION
!
F
OR
THE
COOLING
SYSTEM
,
USE
ONLY
HIGH
-
GRADE
ANTIFREEZER
(M
OTOREX
A
NTI
-F
REEZE
). U
SING LOWERGRADE ANTIFREEZE AGENTS
,
CAN CAUSE CORROSION AND
COOLANT FOAMING
.
Pressure induced by heating of the cooling liquid in the cooling system is
controlled by a valve in the radiator cap
3
; a water temperature rising up to
120° C (248° F) is admissible, without fear of problems.
Checking the cooling liquid level
The cooling liquid should be 10 mm (0,4 in) above the cooling elements
when the engine is cold (cf. diagram). In the event of the cooling liquid
being drained, always fill the system before hand, then top off while the
engine is running.
WARNING
I
F POSSIBLE
,
ALWAYS CHECK LEVEL OF COOLING LIQUID WHEN ENGINE IS COLD
. I
F YOU
HAVE TO OPEN THE RADIATOR CAP WHEN ENGINE IS HOT
,
USE A RAG TO COVER THE CAP
AND OPEN SLOWLY TO RELEASE PRESSURE
.
when engine is cold
10 mm
3
2
1
Summary of Contents for 640 LC4 Adventure
Page 48: ...ENGLISH 47 ...
Page 54: ...ANHANG APPENDICE APPENDIX APÉNDICE 1 ...
Page 55: ...ANHANG APPENDICE APPENDIX APÉNDICE 2 ...
