Cooling System; Description Of The System; Operating Limits - Rotax 914 F Installation Manual

12) Cooling system

12.1) Description of the system

See ill. 16.
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.
2
The shape, size and location of one or more radiators depend mainly on the space
available.
No provision is made for attachment of the radiator(s) on the engine.

12.2) Operating limits

Cylinder head temperatures:
max. ........................................................................ 135° C (275° F)
temperature readings taken on the assigned spot of the hottest cylinder head
NOTE:
Date
Page
1996 05 10
32
1
The hottest cylinder head (either cyl. 2 or 3) has to be found out by
trial. See Ill. 4.
It depends on engine installation (propeller in tractor- or pusher
arrangement).
Install
914 F
3
Ill. 16
Reference
4
Modification-No.
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