Rotax 912-UL Repair Manual

Attach aligning tuol877
260 to
intake flange of cylinder
heads by
4
screws
M6x.
Align cylinder
heads,
thus
warranting a
plane
support
for intake manifold.
Now tighten
cylinder
heads crosswise
to 22 Nm and
remove aligning
tool.
Lubricate all
moving
parts
in rocker arm compartment.
Place both O-rings
on
valve cover,
put
cover
in
position
and tighten
Allen screw M6x30 to
10
Nm.
TNOTE:
Don't
ever change
length of
valve
cover
screw.
Turn
over engine
on trestle
and
fit
the two
other
heads
to
cylinders.
7.4)
Installation of overrunning clutch
Place
ovemrnning
clutch
into
clutch
hous-
ingwith brake
clip
Ovisible.
Atfittingof
brake
clip
compress slightly, using cir-
clip
pliers
and ensure that clip
remains
in
position
and engages
fully
on the catches
of the
clutch
ring
@.
Fit
circlip 68.
Lock crankshaft
using fixing sqew
241
965.
Degyease
taper
and
thread of crankshaft,
and
taper of clutch
housing.
Coat taper
of
clutch
housing thinly
with
LOCTITE 221
and
fit on
crankshaft.
Tum ovemrnning
gear
to facilitate aligning of
the sprags
0.
Overrunning
gear
must
engage
on crankshaft
when turning
anti-
clockwise,
looking
towards
magneto end.
Secure
degreased
hex. nut M34x I
,5
with
LOCTITE 221 and
tighten
to
120 Nm
(1060
in.lb). Check
if
axial clearance
of
ovemrnning
gear
is
still
within 0,2
+
0,5 mm
(0,008
+
0,02").
7.5) Reduction
gear
for electric starter
Place tluust
washer @
125215fl
into
crankcase.
Positi-
on
reduction
ger
O,lubricate shaft O
and
push
inoposition.
Add ttnrst
washer
O 12
5
Dl
5l
l.
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Rm:.91'2-UL

Rotax 912-UL Specifications

General

Displacement	1211 cc
Bore x Stroke	79.5 mm x 61 mm
Compression Ratio	9.0:1
TBO (Time Between Overhaul)	2000 hours
Engine Type	4-cylinder, 4-stroke
Power Output	80 hp
Cooling System	Liquid/air-cooled
Fuel Type	Avgas 100LL or unleaded automotive gasoline
Oil Capacity	3 liters
Fuel System	2 carburetors
Oil System	Dry sump forced lubrication with separate oil tank
Reduction Gear Ratio	2.43:1
Max Continuous Power	75 hp (56 kW)