Cold Weather Operation; Coolant; Lubricant; Cold Start - Rotax 914 Series Operator's Manual

3.9) Cold weather operation

General note

Coolant

Lubricant

Cold start

Icing in the air in-
take system
Remedy
Effectivity: 914 Series
OM Edition 2 / Rev. 0
Generally, an engine service should be carried out before the start
of the cold season.
For selection of coolant and mixing ratio, see "Coolant", 
Chapter 2.2).
For selection of oil, see table of Lubricants
- With throttle closed and choke activated (open throttle renders
starting carb ineffective).
- Be aware, no spark below crankshaft speed of 220 rpm (pro-
peller speed of 90 rpm).
- As performance of electric starter is greatly reduced when hot,
limit starting to periods not much longer than 10 sec. With a
well charged battery, adding a second battery will not improve
cold starts.
Remedy - Cold start
Step
1 Use of multigrade oil with the low end viscosity code of 5 or
10.
2 Gap electrode on spark plug to the minimum or fit new
spark plugs.
3 Preheat engine.
Icing due humidity
Carburetor icing due to humidity may occur on the venturi and on
the throttle valve due to fuel evaporation and leads to perfor-
mance loss and change in mixture.
- Intake air pre-heating is the only effective remedy. See Flight
Manual supplied by the aircraft manufacturer.
- The turbocharger will heat up the intake air. If however a in-
take air pre-heating is necessary, observe the aircraft manu-
facturers engine installation and operating instruction.
BRP-Powertrain
Chapter 2.4)
Procedure
April 01/2010
.
page 3-12