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Main bearing shells
Valve clearance for checking timing
Inner spring:
Data Sheet Fiat 126
Detailed technical data for the Fiat 126.
Our data sheet provides you with key values and specifications taken directly from the original technical table issued by Fiat Customer Service in May 1973.
From engine displacement and valve timing to carburetor dimensions and torque values – here you’ll find precise information on the engine, transmission, suspension and more. Please note that some measurements and units are no longer commonly used today, as materials and standards have evolved.
Chassis No.
126 A
Engine No.
126 A .000
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Engine
Number of cylinders
2
Bore
73,5 mm
Stroke
70 mm
Engine displacement
594 ccm
Compression ratio
7,5
Maximum output (DIN)
23 PS
Maximum power speed
4800 rpm
Maximum torque (DIN)
4 mkg
Revolutions per minute (RPM)
3400 rpm
Top speed
> 105 km/h
Year of manufacture
From 1972
Mayn bearing journal
Standard
53,970 - 53,990
1.Measurement
53,770 - 53,800
2.Measurement
53,570 - 53,600
3.Measurement
53,370 - 53,400
4.Measurement
53,170 - 53,200
Main bearing shells
(inner diameter)
Standard
54,035 - 54,050
1.Measurement
53,835 - 53,850
2.Measurement
53,635 - 53,650
3.Measurement
53,435 - 53,450
4.Measurement
53,235 - 53,250
Connecting rod journal
Standard
44,013 - 44,033
1.Measurement
43,759 - 43,779
2.Measurement
43,505 - 43,525
3.Measurement
43,251 - 43,271
4.Measurement
42,997 - 43,017
Connecting rod bearings
Standard
1,534 - 1,543
1.Measurement
1,661 - 1,670
2.Measurement
1,788 - 1,797
3.Measurement
1,915 - 1,924
4.Measurement
2,042 - 2,051
Main bearing housing bore
59,0 mm
Connecting rod bearing housing bore
47,130 - 47,142
Crankshaft radii
Main bearing
1,8 - 2,0
Connecting rod bearing
1,8 - 2,0
Jeux de montage
Piston
0,030 - 0,050
Main bearing
0,020 - 0,065
Connecting rod bearing
0,011 - 0,061
Valve timing
Intake opens before top dead center
26°
Intake closes after bottom dead center
56°
Exhaust opens before bottom dead center
66°
Exhaust closes after top dead center
16°
Valve clearance when cold
Intake
0,20
Exhaust
0,25
Intake
0,625
Exhaust
0,625
Combustion chamber depth
Permissible resurfacing limit:
With standard head gasket
0 - 0,25 mm
With thick head gasket
0,25 - 0,7 mm
Valve spring heights
Outer spring:Compressed length
38,5 mm
Under load of
23,6 kg
Compressed length
35,5 mm
Under load of
5,2 kg
Tightening torques in mkg
Cylinder head bolt
4,0
Connecting rod bolt
3,5
Nut for rocker arm shaft support
2,5
Flywheel bolt
3,5
Main bearing cap bolts
3,0
Carburetor
Manufacturer
Weber
Type
28 IMB
Venturi
23 mm
Emulsion tube
4 mm
Mayn jet
1,25 mm
Idle jet
0,45 mm
Idle air jet
2 mm
Emulsion tube
F 8
Air correction jet
2,15 mm
Starting jet
0,90 / F 5
Float needle valve
1,25
Float needle valve
8 mm
Float weight
9 g
Fuel pump pressure
0,15 - 0,20 kb/cm²
Oil pressure
2,5 - 3 kb/cm²
Power transmission
Clutch
Pedal free play
28 mm
Transmission
Gear ratios1st gear
3,25
2nd gear
2,067
3rd gear
1,3
4th gear
0,872
Reverse gear
4,024
Differential
Final drive ratio
8/39
Backlash
0,08 - 0,13 mm
Tightening torques in mkg
Nut on bevel gear
5
Crown wheel bolt
4,5
Screw for fastening the bearing cover
1,5
Brakes
4-wheel drum brakes
Drum inner diameter
170,1 - 170,4 mm
Maximum permissible reboring diameter
1 mm
Maximum permissible inner diameter
171,4 mm
Minimum lining thickness
1,5 mm
Chassis
Axle dimensions
Toe-in
-1 - +3 mm
Camber
0°40' - 1°20'
Caster
8° - 10°
Wheelbase
1840 mm
Rear wheel toe-in
5 - 9 mm
Steering angle inside
33°
Steering angle outside
25°40'
Tires
Tire measurements
135 SR - 12
Normal tire pressure:
Front
1,4
Rear
2,0
Rim size
4,00 x 12
Turning radius
8,6 m
Torque for wheel bolts
4,5 - 5,5 mkg
Auxiliary supply
Engine oil
In summer
VS 30
20W - 40
In winter
VS 20W
10W - 30
Total capacity when refilled
2,65 l
Periodic oil change
2,50 l
Gear oil
Type
FIAT - oil ZC 90
Capacity
1,1 ltr.
Differential oil
Type
FIAT - oil ZC 90
Cooling system
Air cooling
Fuel tank
Content
21 l
Electrical system
Ignition timing before top dead center
Initial ignition advance
10°
Centrifugal advance mechanism
13,5°
Revolutions per minute (RPM)
2000 rpm
Centrifugal ignition advance regulator
28° +/-2°
Revolutions per minute (RPM)
3000 rpm
Initial ignition advance
Timing mark
On the pulley
Timing mark
On the timing chain cover
Distributor
Type designation
S 152 A
Contact breaker gap
0,5 +/- 0,03
Dwell angle
In °
78° +/- 3°
In %
43% +/- 2%
Spark plugs
Marelli
CW 8 NP
Champion
L 81 Y
Electrode gap in mm
Marelli
0,6 - 0,7
Champion
0,6 - 0,7
Starter motor
Type
FIAT B 76 - 05 / 12S
Rated power
0,5 kW
Dynamo
Type
DSV/90/12/16/3 S
Maximum current output
16 A
Maximum continuous power output
230 W
Voltage regulator
GN 2/12/19
Regulated voltage
12,4 - 12,8 V
As of May 1973
All information provided without guarantee.