Crank Mechanism — Specifications

Crankshaft

The steel crankshaft is supported by five bearings.

Axial play	0.09 - 0.30 mm
Diameters of main journals:
- nominal size	57.980 – 58.000 mm
- repair size -0.25	57.730 - 57.750 mm
– repair size -0.50	57.480 – 57.500 mm
– repair size -0.75	57.230 - 57.250 mm
Clearance in main bearings*	0.011 - 0.058 mm
Thickness of thrust half rings:
- nominal size	2.301 - 2.351 mm
- repair size	2.491 - 2.541 mm
Connecting rod diameters:
- nominal size	51.980 – 52.000 mm
- repair size -0.25	51.730 – 51.750 mm
– repair size -0.50	51.480 – 51.500 mm
– repair size -0.75	51.230 – 51.250 mm
– repair size -0.75	51.230 – 51.250 mm
Diameters of connecting rod journals, mm:
– engines with a displacement of 1.1 dm3:
nominal size	42.990 – 43.010 mm
repair size -0.25	42.740 - 42.760 mm
repair size -0.50	42.490 - 42.510 mm
repair size -0.75	42.240 - 42.260 mm
repair size -1.0	41.990 – 42.010 mm
– engines with a displacement of 1.3 and 1.6 dm3:
nominal size	47.890 - 47.910 mm
repair size -0.25	47.640 - 47.660 mm
repair size -0.50	47.390 - 47.410 mm
repair size -0.75	47.140 - 47.160 mm
repair size -1.0	46.890 - 46.910 mm
Clearance in connecting rod bearings	0.006 - 0.060 mm

* Measure using Plastigage measuring rods.

Connecting rods

The connecting rods are forged from steel and have an I-profile in cross section.

Connecting rod head bore diameter	20.589 - 20.609 mm
Connecting rod base hole diameter, mm:
– engines with a displacement of 1.1 dm3	46,685 – 46,705
– engines with a displacement of 1.3 and 1.6 dm3	50,890 – 50,910
Internal diameters of connecting rod bearing holes, mm:
– engines with a displacement of 1.1 dm3:
• nominal size	43,016 – 43,050
• repair size -0.25	42,766 – 42,800
• repair size -0.50	42,516 – 42,550
• repair size -0.75	42,266 – 42,300
• repair size -1.0	42,016 – 42,050
– engines with a displacement of 1.3 and 1.6 dm3:
• nominal size	47,916 – 47,950
• repair size -0.25	47,666 – 47,700
• repair size -0.50	47,416 – 47,450
• repair size -0.75	47,166 – 47,200
• repair size -1.0	46,916 – 46,950
Clearance in connecting rod bearings*	0.006 - 0.060 mm
Permissible non-perpendicularity of the axis of the holes relative to the axis of the connecting rod:
- head hole	0.10 mm
- base hole	0.15 mm

* Measure using Plastigage measuring rods.

Pistons

Installation Method: The arrow on the bottom of the piston must point towards the front of the engine (towards the drive of the gas distribution system).

Piston diameter, mm:
– engines with a displacement of 1.1 dm3:
• nominal size 1	73,910 – 73,920
• nominal size 2	73,920 – 73,930
• nominal size 3	73,930 – 73,940
• nominal size 4	73,940 – 73,950
• nominal expanded size	73,930 – 73,955
• enlarged by 0.29 mm	74,210 – 74,355
• enlarged by 0.5 mm	74,460 – 74,885
– engines with a displacement of 1.3 and 1.6 dm3:
• nominal size 1	79,910 – 79,920
• nominal size 2	79,920 – 79,930
• nominal size 3	79,930 – 79,940
• nominal size 4	79,940 – 79,950
• nominal expanded size	79,930 – 79,955
• enlarged by 0.5 mm	80,210 – 80,235
• enlarged by 1.0 mm	80,430 – 80,455
Piston clearance in cylinder:
- nominal size	0.020 - 0.040 mm
– nominal extended size	0.010 - 0.045 mm

Piston rings

Each piston has three rings: two sealing and one oil scraper.

O-ring lock gap (installed in the cylinder), mm:
– engines with a displacement of 1.1 dm3	0,25 – 0,45
– engines with a displacement of 1.3 and 1.6 dm3	0,20 – 0,40
Clearance of the oil scraper ring lock, mm:
– engines with a displacement of 1.1 dm3	0,30 – 0,50
– engines with a displacement of 1.3 and 1.6 dm3	0,4 – 1,4

Piston pins

Length, mm:
– engines with a displacement of 1.1 dm3	63,0 – 63,8
– engines with a displacement of 1.3 and 1.6 dm3	66,2 – 67,0
Diameter, mm:
- marking in white	20,622 – 20,625
- marking in red	20,625 – 20,628
- marked in blue	20,628 – 20,631
- marked in yellow	20,631 – 20,634
Clearance in piston hubs	0.005 - 0.011 mm
Tension in the connecting rod	0.013 - 0.045 mm