Cooling System; Checking The Coolant Level; Bleeding The Cooling System - KTM 400 Owner's Handbook Manual

1
3
30
4
5
2
10 mm
when engine is cold
6

Cooling system

Coolant is circulated by a water pump
engine is cold the coolant circulates only through the cylinder and the cylin-
der head. After the engine has reached its operating temperature (about
70°C, 158°F), the thermostat
through both aluminum radiators.
Air blowing in through the radiators cools the coolant. The slower the speed
of the motorcycle, the less the coolant is cooled down. Dirty
radiators also reduce the cooling efficiency.
Pressure induced by heating of the coolant in the system is controlled by a
3
valve in the radiator cap
(248° F) is admissible, without fear of problems.
WARNING
– I ,
F POSSIBLE ALWAYS CHECK LEVEL OF COOLING LIQUID WHEN ENGINE IS COLD
I
F YOU HAVE TO OPEN THE RADIATOR CAP
TO COVER THE CAP AND OPEN SLOWLY TO RELEASE PRESSURE
!
HAZARD
– D
O NOT DETACH ANY RADIATOR HOSES WHILE THE ENGINE IS HOT
HOT COOLANT AND THE STEAM MAY CAUSE SERIOUS BURNS
– I ,
N CASE YOU GET BURNT HOLD THE AFFECTED PART OF YOUR BODY UNDER RUNNING
!
COLD WATER RIGHT AWAY
– C . K
OOLANT IS TOXIC EEP THE COOLANT OUT OF THE REACH OF CHILDREN
– I ,
N CASE COOLANT IS INGESTED
– I
F COOLANT GETS INTO YOUR EYES
!
AND GO SEE A DOCTOR
A mixture of 40% anti freeze liquid and 60% water is used as coolant.
However, the anti-freeze protection must be at least -25° C (-13° F). This
mixture offers anti-freeze protection but also good corrosion protection and
should therefore not be replaced by pure water.
!
– I
F THE COOLANT HAS BEEN DRAINED
THE COOLING SYSTEM DURING FILLING
– F ,
OR THE COOLING SYSTEM USE ONLY WITH HIGH
A C ). U
DVANCE OOLANT SING LOWER
CORROSION AND COOLANT FOAMING
– E
XTREM CLIMATE CONDITIONS OR STOP AND GO
. T
PROBLEMS O AVOID THIS AN ELECTRIC BLOWER
(
ELECTRIC STARTERS ASK YOUR

Checking the coolant level

The coolant should be 10 mm (0.4 in) above the radiator fins when the
engine is cold (cf. diagram). In the event of the coolant being drained,
always fill and bleed the system.
WARNING
– I ,
F POSSIBLE ALWAYS CHECK LEVEL OF COOLING LIQUID WHEN ENGINE IS COLD
I
F YOU HAVE TO OPEN THE RADIATOR CAP
TO COVER THE CAP AND OPEN SLOWLY TO RELEASE PRESSURE
!
HAZARD
– D
O NOT DETACH ANY RADIATOR HOSES WHILE THE ENGINE IS HOT
HOT COOLANT AND THE STEAM MAY CAUSE SERIOUS BURNS
– I ,
N CASE YOU GET BURNT HOLD THE AFFECTED PART OF YOUR BODY UNDER RUNNING
!
COLD WATER RIGHT AWAY
– C . K
OOLANT IS TOXIC EEP THE COOLANT OUT OF THE REACH OF CHILDREN
– I ,
N CASE COOLANT IS INGESTED
– I
F COOLANT GETS INTO YOUR EYES
!
AND GO SEE A DOCTOR
!
I
F THE COOLANT HAS BEEN DRAINED
COOLING SYSTEM DURING FILLING

Bleeding the cooling system

5
By removing the screw at the front end of the cylinder you can drain the
coolant.
To bleed the cooling system, fill in approx. 0.8 liters (0,2 US Gallons) of
coolant and remove the bleeder screw
until coolant escapes at the bore without any bubbles.
Then, fill in the coolant until it reaches a level about 10mm above the
radiator fins.
After a short ride, check the coolant level once more.
1
located in the engine. When the
2 opens and the coolant is also pumped
; a water temperature rising up to 120° C
3
WHEN THE ENGINE IS HOT
. C
.
!
GO SEE A DOCTOR IMMEDIATELY
,
RINSE THEM OUT WITH WATER IMMEDIATELY
CAUTION
,
IT WILL BE ABSOLUTELY NECESSARY TO BLEED
( ).
SEE BELOW
-
GRADE ANTIFREEZE
-
GRADE ANTIFREEZE AGENTS
.
T
RAFFIC MAY CAUSE OVERHEATING
4
IS OFFERED FOR
KTM D )
EALER ABOUT IT
3
WHEN THE ENGINE IS HOT
. C
.
!
GO SEE A DOCTOR IMMEDIATELY
,
RINSE THEM OUT WITH WATER IMMEDIATELY
CAUTION
,
IT WILL BE ABSOLUTELY NECESSARY TO BLEED THE
( ).
SEE BELOW
6
. Do not reinstall the bleeder screw
.
,
USE A RAG
-
AUTION SCALDING
. T
HE ESCAPING
!
!
( . . S
I E HELL
,
CAN CAUSE
M
ODELLS WITH
.
,
USE A RAG
-
AUTION SCALDING
. T
HE ESCAPING
!
!