Rotax 912 Series Service Manual

BRP-Rotax
Maintenance Manual
72-00-00
page 58
May 01/2007
Effectivity 912/914 Series
Edition 1 / Rev. 0
d02622
When replacing the coolant elbow, mark its position, heat the cylinder head to
approx. 80 °C (176 °F) and unscrew the fitting. Remove residues of LOCTITE
means and check threads. Apply LOCTITE 243 to the thread on the cylinder
head and to the new coolant fitting and screw the fitting into the cold cylinder
head. Leave cylinder head to harden for approx. 10 minutes at 80 °C (176 °F).
If there are oil carbon residues on the sealing face with the cylinder, remove
them carefully. Check that the sealing face is level.
In the case of slight wear, valve and valve seat may be seal-lapped, using emery
paste.
Clean cylinder head and individual components with suitable cleaning agents.
See 00-00-00 sec. 10.3.
Check cylinder head sealing surface and if necessary, blue it and the cylinder.
The flat surface of the cylinder and the cylinder head may only be slightly
machined.
◆ NOTE: In the event of more serious leakage, cylinder and cylinder head
can be reworked as described in the Overhaul Manual by a
ROTAX authorized overhaul facility.
If the engine has been "run hot", the hardness of the cylinder head and the
cylinder material must be checked.
See 72-00-00 sec. 5 and the corresponding Maintenance Manual (Line Main-
tenance) for the respective engine type 912 or 914 Series.
00280
Fig. 72-59
1
2
3

Rotax 912 Series Specifications

General

Redline	5800 rpm
TBO	2000 hours
Displacement	1211 cc
Bore	79.5 mm
Stroke	61 mm
Power Output	80 hp (59.6 kW)
Compression Ratio	9.0:1
Fuel Type	Avgas 100LL
Ignition System	Dual electronic ignition
Fuel System	Fuel Injected
Oil System	Dry sump
Engine Type	4-cylinder, horizontally opposed, 4-stroke