Rotax 912-UL Repair Manual

L1.4) Dimension
sheet
4: Valve
train engine
no.
Valve
train
1)
Checking of actuating
position
on hydraulic
tappets
The nominalworking
point
is
positioned
in
the
mid-range
of the
possible
travel.
Checking
by
measuring valve
clearance
with
tappets empty
(assembly
state) and
pushrods
pressed
down.
The respective
cylinder
must be in
ignition
T.D.C. range.
no.
of cylinder
1 2 3 4 nominal
Tappet
clearance
inlet
2+5mm
.079+.197in
ex-
.
ilausl
remarK
2) Valve
timing at
1
mm valve lift
Set valve
train
free
of
play
by distance
piece
and take
readings
with
cylinder
1 in ignition
T.D.C.
and
at
1 mm
valve
lift.
Priorto
checking
of
valve
timing
furnish
engine
with
dialgauge
support and angle
finder.
Tester:
date:
exhausl
openr
B.B.D.C.
inlet opens
T.D.C
9X
haustcloses
T.D.C.
inlet closss
A.B.D.C.
nominal
44o
+
48o 2ob.
+
2oa. 2ob.
+
2oa. 44o
+
48o
actual
remarks
ft6'pt!:Uf:
77,,,,,,"1992

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)