Use of AvGas requires higher frequency maintenance intervals. If AvGas is used the Rotax web site
should be referenced for maintenance requirements. See Rotax service information 18-UL-97-D/E
Refer to section 2.12 for fuel capacities and limitations
10.6 Fuel Sampling
There is a drain cock on the base of the fuel tank, which may be used to check the quality of the fuel, and to drain
fuel if necessary, it is especially important to remove any water that may have been introduced from the system.
The fuel is checked for water and contaminants by draining a sample of the fuel into a clear glass container. Once
a sample has been taken the quality of the fuel can be checked by looking for any water at the bottom of the
glass, and checking for any other visual contaminants.
If the fuel has been sitting for an extended period without use it may be advisable to replace it with fresh fuel.
For draining the fuel ensure that a suitable receptacle is found for the fuel that is to be drained, position the trike
above the receptacle and open the draincock. Ensure that there are no ignition sources and that the fuel is
disposed of correctly.
10.7 Engine Oil System Replenishment
The minimum oil level is 2 liters, max 3 litres. This checked and replenished by removing the oil sump lid.
Rotax has provided service instructions, which detail how to check the oil.
Removing the sump plug drains the sump. Ensure that the sump plug is correctly replaced and lock wired
prior to refilling the engine with oil. Measure the amount to be replaced, refill, check the level, run the engine
and recheck. The opportunity should be taken to replace the oil filter any time that the oil is replaced.
Oil Level Instructions:
Do not overfill the oil system. The difference between the min and max marks on the dipstick is 0.45 litres.
10.8 Lubricating Oil
The 912 UL engine has an external sump, and the entire system is standard to the Rotax 912 engine.
The oil specification is given in the Rotax Operators Manual, Section 10.2.3, Lubricants. In general use only
synthetic or semi synthetic oil, API classification .SF. or .SG. or later oils. Multigrade is recommended. These oil
types are detergent types. Consult the Rotax manual and Rotax service instruction 18 UL 97, for the correct type
and grade of oil for the ambient operating temperature.
Two oils, which are recommended by the Rotax Service instruction 18, UL 97 for use with both Avgas and
Unleaded fuels are:
SHELL, Advance VSX 4, APISG, SAE 15W-50
VALVOLINE, Dura Blend Synthetic, APISJ, SAE 10W-40
10.9 Cooling System
Water-cooling system capacity is 2.5 l.
Coolant Specification
A MANDATORY Rotax Directive was issued on the 25
th
of November 2004, which requires a change in
the type of coolant that must be used with the Rotax 912 type engine. The reason for the change is .In some
instances conventional coolant (mixture ratio of 50% water and 50% antifreeze) can vaporize or boil before the
maximum permissible cylinder head temperature is reached.. Rotax Service bulletin SB-912-043, pg # 1.
Some Aeros trikes will have a silicate free type high quality and long life antifreeze coolant (which is
yellow), installed in the radiator. This coolant must be changed to the newly
recommended coolant.
The directive requires that the new coolant be used, and a sticker be placed on the coolant cap, which
prohibits the use of water in the coolant system.
The coolant should be replaced according to the Rotax maintenance manual, current issue. Please refer
to the directive, which is available from the Rotax website: SB-912-043, September 04.
Field service Instructions:
If EVANS NPG+ coolant is not locally available, temporarily top off the system with propylene glycol
antifreeze and be sure not to add water. Within 15 days the temporary coolant should be completely
drained and the system refilled with EVANS NPG+ coolant.. Rotax SB-912-043, Pg # 5.
