Crankshaft
Crankshaft steel, forged. The shaft is six-bearing. The upper main bearing shells have oil grooves. On the cheeks of the shaft there are ten counterweights, forged together with the shaft.
Diameter of crankshaft main journals, mm:
- nominal: 58.00-0,022-0,042
- 1st repair size: 57.75-0,022-0,042
- 2nd repair size: 57.50-0,022-0,042
- 3rd repair size: 57.25-0,022-0,042
The diameter of the connecting rod journals of the crankshaft, mm:
- nominal: 46.00-0,022-0,042
- 1st repair size: 45.75-0,022-0,042
- 2nd repair size: 45.50-0,022-0,042
- 3rd repair size: 45.25-0,022-0,042
Axial clearance of the crankshaft, mm:
- nominal: 0.07-0.18;
- maximum allowable: 0.25.
Gap between liners and main journals of the crankshaft, mm:
- nominal: 0.016-0.075;
- maximum allowable (when worn): 0,16.
Pistons
Pistons are made of aluminum alloy with steel inserts. Each piston has two compression rings and one oil scraper ring. For the correct installation of the piston in the cylinder, there is an arrow on the bottom, which must be turned towards the camshaft drive. Measure the piston diameter at a distance of 10 mm from the edge of the piston skirt at an angle of 90°relative to the axis of the piston pin. The deviation of the piston diameter from the nominal size should not exceed 0.04 mm.
Basic piston dimensions
Piston pins
The piston pin is floating. From axial movement, it is held by two retaining rings.
Piston pin diameter, mm: 20.
Piston pin length, mm: 54.
Piston rings
Three rings are installed on each piston: two compression and one oil scraper.
Clearance in the lock of piston rings, mm:
- nominal: 0.25-0.50;
- maximum allowable: 1.00.
Gap between piston ring and groove, mm:
- nominal: 0.02-0.08;
- maximum allowable: 0.10.
Connecting rods
Connecting rods are steel, forged, with an I-section rod, with thin-walled liners. A bushing is pressed into the upper head of the connecting rod. There are technological lugs on the bottom head and on the connecting rod cap showing how to install them correctly. The tides should be directed towards the camshaft drive.
Gap between liners and crankshaft journals, mm:
- nominal: 0.015-0.062;
- maximum allowable (when worn): 0,12.
Maximum axial clearance of the connecting rod on the crankshaft journal, no more than, mm: 0.4.
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