Haynes - Fiat 127.pdf

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haynes-1050
1049 cm 3
opis ě ásti servisního manuálu
Fiat 127
29809544.001.png
Fiat 127 Internet Fan Club (http://fiat127.okruhy.cz) Fiat 127 - 1050
Supplement
Contents
Introduction ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... 1
Specifications ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... 2
Engine … … … ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... 3
Crankshaft - refitting
Piston rings - refitting
Pistons and connecting rods - reassembly
Pistons - refitting
Connecting rods to crankshaft - reassembly
Oil pump - reassembly
Crankshaft oil seals and carriers - refitting
Sump - refitting
Auxiliary shaft and seal - refitting
Belt - pulleys and tensioner - refitting
Cylinder head and valve gear - reassembly
Distributor - refitting
Toothed drive belt - removal, refitting and adjusting
Valve clearances - adjustment
Engine - final assembly
Engine removal – 127 Special and 127 from chassis number 1104290 onwards
Fuel system ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... 4
Carburettors - general
Weber or Solex single venturi carburettors
Weber dual venturi carburettor
Carburettor overhaul - general
Ignition system... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... 5
Automatic centrifugal advance curves
Braking system... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... 6
Brake fluid reservoir and vacuum servo unit (Sport)
Electrical system... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... . 7
Fuses (127 Special)
Fuses (1049 cc models)
Bodywork and fittings ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... 8
Wing mouldings and front spoiler (Sport) - removal and refitting
Rear spoiler (Sport) – removal and refitting
2/34
1049 cc engine - general
Charging system
Model variations
Fiat 127 Internet Fan Club (http://fiat127.okruhy.cz) Fiat 127 - 1050
1. Introduction
Since its first introduction in 1971 the FIAT
127 has undergone a continuing programme of
improvements concerned mainly with styling
and trim alterations. However, in 1977 a new
model range was introduced which included the
option of a larger engine of 1049 cc capacity
with a single overhead camshaft. In
appearance, cars in the new range are broadly
similar to the earlier models but they have a
lower bonnet line, larger glass area and
redesigned bumpers.
engine with a twin choke carburettor. Apart from
minor body styling changes, the Sport is
equipped with a larger capacity sump, twin
exhaust tailpipes, servo braking, additional
instrumentation and a laminated windscreen.
This supplement has been added to cater
for some of the production changes which have
been made, but principally to cover the 1049 cc
engine. The material given in Chapters 1 to 12
still applies unless superseded by information
contained in this Supplement. Therefore,
always read this Chapter in conjunction with the
rest of the book.
In October 1978, the FIAT 127-Sport was
launched. This is a high performance version of
the three door hatchback having the 1049 cc
3/34
Fiat 127 Internet Fan Club (http://fiat127.okruhy.cz) Fiat 127 - 1050
2. Specifications
Capacities (1049 cc models )
Engine oil (including filter change)
L, C and CL ... ... ... ... ... ... ... ... …
Sport
... ... ... ... ... ... ... ... ...
5.5 pints (3.1 litres)
Coolant
... ... ... ... ... ... ... ... …
9.7 pints (5.5 litres)
Fuel
... ... ... ... ... ... ... ... …
6.7 gallons (30.5 litres) including 6.2 pints
(3.5 litres) reserve
Transmission oil ... … ... ... ... ... ... ... .
4.2 pints (2.4 litres)
1049 cc OHC engine
General
Type number ... ... ... ... ... ... ... ... … 127 A 000 (C, L and CL);
127 A1.000 (Sport)
Bore ... ... ... ... ... ... ... ... … 2.992 in (76 mm)
Stroke ... ... ... ... ... ... ... ... ... 2.276 in (57.8 mm)
Capacity ... ... ... ... ... ... ... ... … 64 cu in (1049 cc)
Compression ratio ... ... ... ... ... … 9,3 : 1 (C, L and CL);
9,8 : 1 (Sport)
Maximum horsepower (DIN) ... ... ... ... 50 HP at 5600 rpm (C, L and CL);
70 HP at 5600 rpm (Sport)
Valve mechanism
C, L and CL
Sport
Inlet :
Opens ... ... ... ... ... ... ... ... ...
2° BTDC
6° BTDC
Closes ... ... ... ... ... ... ... ... ...
42°ABDC
46°ABDC
Exhaust :
Opens ... ... ... ... ... ... ... ... ...
42° BBDC
47° BBDC
Closes ... ... ... ... ... ... ... … …
2° ATDC
7° ATDC
Valve clearances (cold) :
For checking valve timing:
Inlet ... ... ... ... ... ... ... ... 0.028 in (0.70 mm) 0.032 in (0.80 mm)
Exhaust ... ... ... ... ... ... ... 0.028 in (0.70 mm) 0.032 in (0.80 mm)
Adjustment for running (engine cold) :
Inlet ... ... ... ... ... ... ... ... 0.012 in (0.30 mm) 0.016 in (0.40 mm)
Exhaust ... ... ... ... ... ... ... 0.016 in (0 40 mm) 0.020 in (0.50 mm)
Cylinder block and connecting rods inches mm
Cylinder bore diameter * 2.992 to 2.994 76.00 to 76.05
* Cylinder bores are graded and have a variation of 0.0004 inch (0.01 mm) between each grade
Main bearing housing bore diameter
2.044 to 2.045
51.921 to 51.934
Width of centre main bearing cap between
thrust washers
1.088 to 1.091
27.64 to 27.70
Connecting rod big-end diameter
1.85 to 1.8560
47.130 to 47.142
Connecting rod small-end diameter
0.8638 to 0.8646
21.94 to 21.96
Big-end bearing shell thickness
0.0606 to 0.8646
1.539 to 1.55
4/34
7.7 pints (4.4 litres)
Fiat 127 Internet Fan Club (http://fiat127.okruhy.cz) Fiat 127 - 1050
Big-end bearing shell undersize range 0.01; 0.02; 0.03; 0.04 0.254; 0,508; 0.762; 1.016
Gudgeon pin interference fit in small-end:
C, L and CL 0.0004 to 0.0017 0.01 to 0.042
Sport 0.0004 to 0.0006 0.01 to 0.016
Crankpin to bearing fit clearance 0.0009 to 0.003 0.022 to 0.076
Maximum misalignment between big and small-end axes measured 4.92 in (125 mm) from
Connecting rod
± 0.004
± 0.10
Pistons, rings and pins
inches
mm
Standard piston diameter, measured 0.925 inch (23.5 mm) from piston skirt base :
Grade A
2.989 to 2.9894
75.92 to 75.93
Grade C
2.9898 to 2.9902
75.94 to 75.95
Grade E
2.9906 to 2.9909
75.96 to 75.97
Range of oversize pistons
0.0079; 0.0157; 0.0236
0.2; 0.4; 0.6
Piston boss diameter (C, L and CL):
Grade 1
0.8654 to 0.8656
21.982 to 21.986
Grade 2
0.8655 to 0.8657
21.986 to 21.990
Grade 3
0.8657 to 0.8659
21.990 to 21.994
Piston boss diameter (Sport):
Grade 1
0.7874 to 0.7875
19.999 to 20.002
Grade 2
0.7875 to 0.7876
20.002 to 20.005
Ring groove width (C,L and CL) :
Top groove
0.0604 to 0.0612
1.535 to 1.555
Centre grove
0.0799 to 0.0807
2.030 to 2.050
Bottom groove
0.1562 to 0.1570
3.967 to 3.987
Ring groove width (Sport) :
Top groove
0.0604 to 0.0612
1.535 to 1.555
Centre grove
0.0793 to 0.0801
2.015 to 2.035
Bottom groove
0.1558 to 0.1566
3.957 to 3.977
Standard gudgeon pin diameter (C, L and CL):
Grade 1
0.8650 to 0.8651
21.970 to 21.974
Grade 2
0.8651 to 0.8652
21.974 to 21.978
Grade 3
0.8652 to 0.8654
21.978 to 21.982
Standard dudgeon pin diameter (Sport) :
Grade 1
0.7872 to 0.7873
19.994 to 19.997
Grade 2
0.7873 to 0.7874
19 997 to 20.000
Oversize gudgeon pin diameter
0.0079; 0.0157; 0.0236
0.2; 0.4; 0.6
Piston ring thickness :
Top compression ring
0.0582 to 0.0587
1.478 to 1.490
2nd oil control ring
0.0779 to 0.0783
1.978 to 1.990
3rd oil scraper ring
0.1545 to 0.1550
3.925 to 3.937
Piston to bore fit clearance
0.0028 to 0.0035
0.070 to 0.090
Gudgeon pin fit clearance in piston
0.0003 to 0.0006
0.008 to 0.016
Piston ring side clearance in groove:
1st compression ring
0.0018 to 0.003
0.045 to 0.077
2nd oil control ring
0.0010 to 0.0022
0.025 to 0.057
3rd oil scraper ring
0.0008 to 0.002
0.020 to 0.052
Piston ring end gap:
1st compression ring (C, L and CL)
0.0079 to 0.0157
0.20 to 0.40
1st compression ring (Sport)
0.0118 to 0.0197
0.30 to 0.50
2nd oil control ring
0.0118 to 0.0197
0.30 to 0.50
3rd oil scraper ring
0.0079 to 0.0138
0.20 to 0.35
Piston rings oversize range
0.0079; 0.0157; 0.0236
0.2; 0.4; 0.6
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