1•2 engine – general, Cylinder block and crankcase, Pistons and piston rings – FIAT Uno 45 User Manual

Page 16: Crankshaft, Camshaft

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Cylinder block and crankcase

Material . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Cast-iron

Bore diameter . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

65.000 to 65.050 mm (2.5591 to 2.5610 in)

Diameter of camshaft bearing bores in crankcase timing gear end:

Grade B . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

50.505 to 50.515 mm (1.9882 to 1.9886 in)

Grade C . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

50.515 to 50.525 mm (1.9886 to 1.9890 in)

Grade D . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

50.705 to 50.715 mm (1.9960 to 1.9964 in)

Grade E . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

50.715 to 50.725 mm (1.9964 to 1.9968 in)

Centre . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

46.420 to 46.450 mm (1.8275 to 1.8287 in)

Flywheel end . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

35.921 to 35.951 mm (1.4142 to 1.4154 in)

Maximum cylinder bore taper . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

0.015 mm (0.0006 in)

Maximum cylinder bore ovality . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

0.015 mm (0.0006 in)

Pistons and piston rings

Piston diameter:

Grade A . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

64.940 to 64.950 mm (2.5566 to 2.5570 in)

Grade C . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

64.960 to 64.970 mm (2.5574 to 2.5578 in)

Grade E . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

64.980 to 64.990 mm (2.5582 to 2.5586 in)

Oversizes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

0.2, 0.4, 0.6 mm (0.008, 0.016, 0.024 in)

Piston clearance in cylinder bore . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

0.050 to 0.070 mm (0.0020 to 0.0028 in)

Piston ring groove width:

Top . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

1.785 to 1.805 mm (0.0703 to 0.0711 in)

Second . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

2.015 to 2.035 mm (0.0793 to 0.0801 in)

Bottom . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

3.975 to 3.977 mm (0.1566 to 0.1567 in)

Piston ring thickness:

Top . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

1.728 to 1.740 mm (0.0680 to 0.0685 in)

Second . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

1.978 to 1.990 mm (0.0779 to 0.0784 in)

Bottom . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

3.925 to 3.937 mm (0.1545 to 0.1550 in)

Piston ring groove clearance:

Top . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

0.045 to 0.077 mm (0.0018 to 0.0030 in)

Second . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

0.025 to 0.057 mm (0.0010 to 0.0022 in)

Bottom . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

0.020 to 0.052 mm (0.0008 to 0.0020 in)

Piston ring end gap:

Top . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

0.25 to 0.45 mm (0.0098 to 0.0177 in)

Second . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

0.20 to 0.35 mm (0.0078 to 0.0137 in)

Bottom . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

0.20 to 0.45 mm (0.0078 to 0.0177 in)

Oversize piston rings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

0.2, 0.4, 0.6 mm (0.008, 0.016, 0.024 in)

Gudgeon pin diameter:

Grade 1 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

19.970 to 19.974 mm (0.7862 to 0.7863 in)

Grade 2 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

19.974 to 19.978 mm (0.7863 to 0.7865 in)

Grade 3 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

19.978 to 19.982 mm (0.7865 to 0.7866 in)

Oversize . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

0.2 mm (0.008 in)

Crankshaft

Journal diameter . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

50.785 to 50.805 mm (1.9994 to 2.0002 in)

Standard main bearing shell thickness . . . . . . . . . . . . . . . . . . . . . . . . . .

1.832 to 1.837 mm (0.0721 to 0.0723 in)

Undersizes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

0.254, 0.508, 0.762,1.016 mm (0.010, 0.020. 0.030, 0.040 in)

Crankshaft endfloat . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

0.06 to 0.26 mm (0.0024 to 0.0102 in)

Crankpin diameter . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

39.985 to 40.005 mm (1.5741 to 1.5750 in)

Standard big-end shell bearing thickness . . . . . . . . . . . . . . . . . . . . . . .

1.807 to 1.813 mm (0.0712 to 0.0714 in)

Undersizes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

0.254, 0.508, 0.762, 1.016 mm (0.010, 0.020, 0.030, 0.040 in)

Camshaft

Diameter of camshaft journals:

Timing end . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

37.975 to 38.000 mm (1.4951 to 1.4961 in)

Centre . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

43.348 to 43.373 mm (1.7079 to 1.7088 in)

Flywheel end . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

30.975 to 31.000 mm (1.2194 to 1.2205 in)

Bush reamed diameters:

Timing gear end* . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

38.025 to 38.050 mm (1.4971 to 1.4981 in)

Centre . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

43.404 to 43.424 mm (1.7088 to 1.7096 in)

Flywheel end . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

31.026 to 31.046 mm (1.2215 to 1.2223 in)

*Supplied reamed to size
Cam lift . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

5.1 mm (0.201 in)

Outside diameter of cam follower . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

13.982 to 14.000 mm (0.5505 to 0.5512 in)

Oversizes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

0.05 to 0.010 mm (0.002 to 0.004 in)

Cam follower running clearance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

0.010 to 0.046 mm (0.0004 to 0.0018 in)

1•2 Engine – general

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