EV-97 Eurostar SL Microlight Maintenance Manual GEN/EUR/04 Issue 4
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5.
Maintenance Procedures
5.1
Rotax 912 UL engine
See Maintenance Manual for Rotax Engine Type 912UL Series (part. No. 899 372)
5.2
Oil
The Rotax 912 lubrication system in the SL has a capacity of 3.5litres. Before checking oil level in
the tank, all oil which remains in the crankcase must be pumped back into the tank. To do this:
Remove the oil tank cap. With the ignition off, turn the propeller by hand in the normal direction,
holding it at the cylinder peak compression points (top dead centre). Eventually a gurgling will be
heard from the oil tank as crankcase pressure pushes all the oil back into the oil tank and air
follows.
After completing this procedure the oil level must lie within the flat region of the dipstick.
5.3
Oil Draining
The operation is best done with a warm engine.
A drain plug is installed on the bottom of the oil tank. Remove its locking wire, unscrew the plug
and allow all the oil to drain into a container. When replacing the plug, use a new copper washer.
5.4
Oil Filter Replacement
Remove both engine cowlings. Unscrew the elbow on the left
front (as viewed in flight direction) exhaust pipe using a
12mm spanner. Loosen the pipe clamp on the exhaust
muffler using a 13mm spanner. Disconnect the elbow from
the engine and turn the exhaust pipe slightly to move it away
from the oil filter. Replace the oil filter with a new one. See
Maintenance Manual (Line Maintenance) for ROTAX Engine
Type 912 Series for replacement instructions.
Re-connect the elbow to the engine and install the nuts
finger-tight. Set the exhaust pipe so that it clears the radiator
hose and oil filter. Clearance from the radiator hose must be
min. 0.8 in (20 mm) and approximately 0.2 in (5 mm) from oil
filter. When clearances are set, tighten the elbow and clamp
and re-check. Top up the oil and re-install the engine
cowlings. Run the engine for a few seconds, then re-check
the oil level in the tank.
5.5
Coolant
The coolant capacity is 1.5 litres. See Rotax manual (+ bulletins) for details of permitted coolants.
LSA recommends glycol coolant mixed 50% with water.
The coolant level in the small black expansion tank mounted on the engine should reach the
bottom of the filler neck; the level in the overflow bottle, mounted on the firewall, should be a
minimum of 25mm from the bottom.
