d06525.fm
20 December 2017 12-10-00
page 6 of 13
Copyright - BRP-Rotax GmbH & CO KG. All rights reserved.
SI-912 i-001R5 / SI-915 i-001
SI-912-016R10 / SI-914-019R10
SERVICE INSTRUCTION
4) Coolant
4.1) General
All engine types 912 i, 915 i, 912 and 914 Series have liquid cooled cylinder heads and ram air
cooled cylinders. The function of the coolant is to protect the cylinder heads from over-tempera-
ture by means of heat dissipation. Protection against corrosion of the engine components and
freezing of the coolant is achieved with appropriate additives.
In principle, 2 different types of coolant are permitted:
- Conventional coolant based on ethylene glycol with 50% water content
- Waterless coolant based on propylene glycol (not allowed for 912 i and 915 i Series)
4.2) Conventional coolant
Conventional coolant (with about 50% water content) has a specific thermal capacity that is higher
than waterless coolant. It gives excellent corrosion protection, especially for aluminum, and pro-
tection against freezing.
NOTE: For exact monitoring of the coolant temperature, a limit has been set. This
is necessary because standard coolant based on ethylene glycol such as
BASF Glysantin in a 50/50 proportion mixture can boil at a temperature as
low as 120 °C (248 °F). Refer to the current Installation Manual for more
information and instructions.
NOTE: Coolant should be a low silicate and nitrite free formula. Follow coolant
manufacturer directions regarding mixture percentages etc..
Coolants with a mixture of 50% antifreeze and 50% of distilled water recommended by the
authorized distributors (not tested from BRP-Rotax).
NOTE: The following list is based on the experiences and local recommendation
by the authorized distributors. Coolant brands, with same designation, may
vary from one to the other region. Please contact the local distributor for a
recommendation.
Waterless coolant based on propylene glycol is not permitted for engine
types 912 i and 915 i Series.
The certification and determination of the correct coolant type must be
conducted by the aircraft manufacturer. As each aircraft type has different
characteristics, testing must be done to determine the most suitable cool-
ant and instrumentation for each aircraft type.
Brand Description
BASF
®
Glysantin Protect Plus/G48
CASTROL
®
Antifreeze All-Climate
CASTROL
®
Antifreeze Anti-Boil
OMV
®
OMV Coolant Plus
PETROL
®
Antifreeze Concentrate / Antifreeze G 11
PRESTONE
®
DEX-COOL extended life
PRESTONE
®
50/50 preluded DEX-COOL extended life
SHELL
®
DEX-COOL
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