width FIAT 127 1973 1.G Workshop Manual

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2. Specifications

Capacities (1049 cc models )
Engine oil (including filter change)
L, C and CL ... ... ... ... ... ... ... ... … 5.5 pints (3.1 litres)
Sport ... ... ... ... ... ... ... ... ... 7.7 pi nts (4.4 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 l itres)


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 a t 5600 rpm (C, L and CL);
70 HP at 5600 rpm (Sport)

Valve mechanism C, L and CL Sport
Inlet :
Opens ... ... ... ... ... ... ... ... ... 2° B TDC 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 ... ... ... ... ... ... ... ... 0.02 8 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 ... ... ... ... ... ... ... ... 0.01 2 in (0.30 mm) 0.016 in (0.40 mm)
Exhaust ... ... ... ... ... ... ... 0.016 i n (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 7 6.05
* 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

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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; 0.02 36
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; 0.023 6 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 0.000 6 0.008 to 0.016
Piston ring side clearance in groove:
1st compression ring 0.0018 to 0.003 0.045 to 0.07 7
2nd oil control ring 0.0010 to 0.0022 0.025 to 0.0 57
3rd oil scraper ring 0.0008 to 0.002 0.020 to 0.05 2
Piston ring end gap:
1st compression ring (C, L and CL) 0.0079 to 0.015 7 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; 0.0 236
0.2; 0.4; 0.6

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Crankshaft inches mm
Main bearing journal diameter 1.8972 to 1.898 48.1 89 to 48.209
Standard main bearing shell thickness 0.0721 to 0.0 726 1.831 to 1.845
Main bearing shell undersize range 0.01; 0.02; 0.03 ; 0.04 0.254; 0.508; 0.762; 1.016

Standard crankpin diameter 1.7318 to 1.7326 43.988 to 44.008
Main bearing journal fit clearance 0.0009 to 0.033 0.022 to 0.083
Width of centre main bearing cap between
thrust washers 1.2785 to 1.2805 32.475 to 32.525
Standard thrust washers thickness 0.0909 to 0.0929 2.31 to 2.36
Thrust washers oversize range 0.0959 to 0.0979 2.43 7 to 2.487
Crankshaft endfloat 0.0022 to 0.0104 0.055 to 0.265
Maximum misalignment of main bearing
journals 0.0012 0.030
Maximum misalignment of main bearing
journals to crankpins 0.0138 0.350
Maximum ovality of crankpins and main
bearing journals after grinding 0.0002 0.005
Maximum taper of crankpins and main
bearing journals after grinding 0.0002 0.005
Maximum run-out of crankshaft flange with
dial gauge stylus 31 mm (1.22 ins) from
crankshaft rotational axis 0.001 0.025
Maximum run-out between flywheel face
and crankshaft flange, and between
flywheel face and crankshaft axis 0.0039 0.10

Cylinder head inches mm
Standard valve guide housing bore 0.5886 to 0.5896 14.950 to 14.977
Standard valve outside diameter 0.5921 to 0.5928 15 .040 to 15.058
Oversize valve guide 0.002; 0.0039; 0.0098
0.05; 0.10; 0.25
Valve guide interference fit 0.0025 to 0.0043 0.063 to 0.108
Fitted valve guide internal diameter 0.3158 to 0.31 65 8.022 to 8.040
Valve stem diameter 0.3139 to 0.3146 7.974 to 7.992
Valve stem fit clearance in guide 0.0012 to 0.0026 0.030 to 0.066
Valve head diameter:
Inlet (C, L and CL) 1.3327 to 1.3445 33.85 to 34 .15
Inlet (Sport) 1.4311 to 1.4429 36.35 to 36.65
Exhaust 1.1358 to 1.1476 28.85 to 29.15
Valve seat width 0.0787 to 0.0866 2.0 to 2.2
Valve seat internal diameter:
Inlet (C, L and CL) 1.1063 to 1.1142 28.1 to 28. 3
Inlet (Sport) 1.2244 to 1.2323 31.1 to 31.3
Exhaust (C, L and CL) 0.9882 to 0.9961 25.1 to 2 5.3
Inlet (Sport) 1.0276 to 1.0354 26.1 to 26.3
Angle of valve seat 45° ± 5'
Angle of valve face 45° 30' ± 5'
Valve springs:
Inner spring part no. 4134900
Outer spring part no. 4170458
Valve gear inches mm
Camshaft journal diameter:
Valve gear end 1.1789 to 1.1795 29.945 to 29.96 0
Centre 1.0630 to 1.0636 27.000 to 27.015
Flywheel end 0.9843 to 0.9848 25.000 to 25.015