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Chapter 1 engine, Specifications contents, Degrees of difficulty – FIAT Uno 45 User Manual

Page 15

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1

903 cc engine

Type

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Four cylinder in-line, liquid cooled, overhead valve. Transversely
mounted with end-on transmission

General

Bore . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

65.0 mm (2.56 in)

Stroke . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

68.0 mm (2.68 in)

Displacement . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

903 cc (55 cu in)

Compression ratio:

900 models . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

9.0 : 1

900 ES models . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

9.7 : 1

Maximum power (DIN) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

33.1 kW at 5600 rev/min (45 bhp)

Maximum torque (DIN):

900 models . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

68 Nm at 3000 rev/min (49 lbf ft)

900 ES models . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

69 Nm at 3000 rev/min (51 lbf ft)

Compression pressure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

9.3 to 10.35 bar (135 to 150 lbf/in2)

Maximum pressure difference between cylinders . . . . . . . . . . . . . . . . .

0.69 bar (10 lbf/in2)

Firing order . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

1 - 3 - 4 - 2 (No. 1 at crankshaft pulley end)

Chapter 1 Engine

For modifications, and information applicable to later models, see Supplement at end of manual

Part 1: General

Crankcase ventilation system . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

3

Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

1

Engine oil and filter . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

2

Major operations possible without removing the engine

from the car . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

4

Part 2: 903 cc engine

Cylinder head - dismantling and decarbonising . . . . . . . . . . . . . . . . 17
Cylinder head - removal and refitting . . . . . . . . . . . . . . . . . . . . . . . .

7

Engine - complete dismantling . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
Engine - complete reassembly . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
Engine - dismantling (general) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
Engine - initial start-up after overhaul or major repair . . . . . . . . . . . . 24
Engine - method of removal . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
Engine - reassembly (general) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
Engine - refitting ancillary components . . . . . . . . . . . . . . . . . . . . . . . 21
Engine - removing ancillary components . . . . . . . . . . . . . . . . . . . . . 15
Engine mountings - renewal . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
Engine/transmission - reconnection . . . . . . . . . . . . . . . . . . . . . . . . . 22
Engine/transmission - refitting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23
Engine/transmission - removal and separation . . . . . . . . . . . . . . . . . 13
Examination and renovation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
Fault finding - all engines . . . . . . . . . . . . . . . . . . . . See end of Chapter
Oil pump - removal and refitting . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
Pistons/connecting rods - removal and refitting . . . . . . . . . . . . . . . .

9

Sump pan - removal and refitting . . . . . . . . . . . . . . . . . . . . . . . . . . .

8

Timing chain and sprockets - removal and refitting . . . . . . . . . . . . .

6

Valve clearances - adjustment . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

5

Part 3: 1116 cc and 1301 cc engines

Camshaft and camshaft carrier - removal and refitting . . . . . . . . . . 27
Cylinder head - dismantling and decarbonising . . . . . . . . . . . . . . . . 39
Cylinder head - removal and refitting . . . . . . . . . . . . . . . . . . . . . . . . 29
Engine - complete dismantling . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 38
Engine - complete reassembly . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 42
Engine - dismantling (general) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 36
Engine - initial start-up after major overhaul . . . . . . . . . . . . . . . . . . . 45
Engine - method of removal . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34
Engine - reassembly (general) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 41
Engine ancillary components - refitting . . . . . . . . . . . . . . . . . . . . . . . 43
Engine ancillary components - removal . . . . . . . . . . . . . . . . . . . . . . 37
Engine mountings - renewal . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33
Engine/transmission - reconnection and refitting . . . . . . . . . . . . . . . 44
Engine/transmission - removal and separation . . . . . . . . . . . . . . . . . 35
Examination and renovation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 40
Fault finding - all engines . . . . . . . . . . . . . . . . . . . . See end of Chapter
Oil pump - removal and refitting . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31
Pistons/connecting rods - removal and refitting . . . . . . . . . . . . . . . . 32
Sump pan - removal and refitting . . . . . . . . . . . . . . . . . . . . . . . . . . . 30
Timing belt - renewal . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28
Valve clearances - adjustment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26
Valve clearances - checking . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25

1•1

Specifications

Contents

Easy, suitable for
novice with little
experience

Fairly easy, suitable
for beginner with
some experience

Fairly difficult,
suitable for competent
DIY mechanic

Difficult, suitable for
experienced DIY
mechanic

Very difficult,
suitable for expert DIY
or professional

Degrees of difficulty

5

4

3

2

1

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