Description Of The Systems; Cooling System - Rotax 914 F Maintenance Manual

9) Description of the systems

9.1)

Cooling system

See Pic.10.
The cooling system of the ROTAX 914 F is designed for liquid cooling of the cylinder
heads and ram-air cooling of the cylinders.
The cooling system of the cylinder heads is a closed circuit with an expansion tank.
The coolant flow is forced by a water pump, driven from the camshaft, from the radiator
to the cylinder heads. From the top of the cylinder heads the coolant passes on to the
expansion tank Q. Since the standard location of the radiator W is below engine level,
the expansion tank located on top of the engine allows for coolant expansion.
The expansion tank is closed by a pressure cap E (with excess pressure valve and
return valve). At temperature rise of the coolant the excess pressure valve opens and
the coolant will flow via a hose at atmospheric pressure to the transparent overflow
bottle R. When cooling down, the coolant will be sucked back into the cooling circuit.
The expansion tank Q has to be always full with coolant and coolant level in overflow
bottle R ought to be between the two marks.
ATTENTION:Too high pressure in the cooling system might cause damage.
The coolant hoses Y for cyl. 1 and 2 are routed very close to the exhaust system
therefore they are additionally protected by a heat resistant protection hose.
2
NOTE:
Date
Page
1997 02 01
30
Therefore the hose from expansion tank to overflow bottle and the
venting bore T must remain open.
1
6
Filling or replenishing of the cooling system always on the expansion
tank E.
To drain the coolant open the radiator cap and remove the lowest
attachment screw (with sealing ring) of the water pump, as this is the
lowest point of the engine assembly.
Main
914 F
3
5
Pic. 10
00125
Reference
4
Modification no.
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