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The 532 Rotax and 582 Rotax ultralight aircraft
engines are liquid cooled. To help them maintain a constant temperature,
and to aid in bringing them up to operating temperature, especially in
winter conditions they should have a thermostat installed in them. ROTAX
does NOT ship the engines out with thermostats!
To install the thermostat you must first drain
your coolant down to a level just below the cylinder head in an upright
engine installation. In an inverted installation the system must be
drained until their is no fluid in the engine.
Next use a Philips screw driver and loosen the two
clamps which are used to hold the rubber intake sockets onto to the intake
manifold, you only need to loosen one clamp on each carb.
Once this has been accomplished you need to remove
the two nuts, lock washers and flat washers holding the top of the rotary
valve tank bracket.
You must also remove the two TOP 13 mm head bolts,
lock washers and flat washers from the top of the intake manifold
plate.
Now gently pull out on the coil mounting plate
until it is clear of the two top two studs. You may have to slacken off
the spark plug wires to do this. Remove the water outlet socket. Behind it
you will find a rubber O ring remove it.
Now to install the thermostat first install the
NEW rubber O ring that comes with the
 thermostat, ONTO the thermostat. The
thermostat fits into the MIDDLE of the O ring. That is there is a slit in
the middle of the NEW "O" ring place
the thermostat into it. Once the O ring has been installed onto the
thermostat, place the thermostat with the "POINT" of the
thermostat facing out, the "FLAT" side facing in and the two
holes in the outside ring of the thermostat facing UP toward the sky!
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