Tool for dismantling crankshafts. Drawing, description

PERSONAL TRANSPORT: GROUND, WATER, AIR
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Tool for dismantling crankshafts. Personal transport

Personal transport: land, water, air

Directory / Personal transport: land, water, air

As you know, in two-stroke motorcycle engines, the bearing of the lower head of the connecting rod is one of the most loaded nodes. At the same time, the term and quality of the engine operation depend on its technical condition. It is almost impossible to determine wear, and even more so to carry out the necessary repairs without disassembling the crankshaft.

But when preparing a motorcycle or microcar (map) for work in difficult conditions (for example, at competitions), it is often necessary to disassemble the crankshaft. The design of the crankshafts and the effort required for disassembly complicate this operation not only at home, but also in SYUT workshops, karting sections, and motorcycle clubs. The currently used method of pressing out the pin of the lower head of the connecting rod in a vice is far from perfect and can lead to damage to this scarce part.

A simple device for disassembling the crankshaft, offered to the attention of readers, was developed in the auto design circle of the Tula Palace of Pioneers. It allows you to disassemble the crankshafts of motorcycle engines with a neck diameter of 130-135 mm, and - 29 mm, which corresponds to the K-175 engines of the Kovrov plant and all motorcycles of the Minsk Motor Plant, that is, the most common in our country.

The device consists of a body, a strap, a pressure screw and M8x50 bolts with washers. They are made from tool steel with heat treatment, zinc or cadmium.

The technology for disassembling the crankshaft with its help is simple. Having fully unscrewed the pressure screw, the assembly is put on the crankshaft, placing the housing between the cheeks so that the connecting rod fits in the cutout of the housing. Through the threaded hole in the bar for the pressure screw, this hole is centered relative to the hole in the pin of the lower head of the connecting rod. Then a ball from a bearing Ø 10-12 mm is inserted here, hold it with your hand from falling out and wrap it, screw 3 until it touches the ball. After that, the assembly is fixed in a vice, and the finger is pressed out by tightening the screw with an appropriate wrench or wrench with a diameter of 12-14 mm and a length of 250-300 mm.

If everything was done correctly, without distortions, the finger is pressed out without difficulty.

Details of the tool for disassembling crankshafts (click to enlarge): 1 - body, 2 - bar, 3 - pressure screw, 4 - M8x50 bolt, 5 - washer, 6 - ball, 7 - crankshaft web

As a pressure screw, a threaded pin of the front suspension of a GAZ-21 Volga car (part 20-2904068) can be used, the end of which is turned according to the drawing. We used a turning tool holder as a blank for the bar.

If desired, a conventional type puller can be made from the parts of this device using a bar with a pressure screw. To do this, it is enough to drill appropriate holes in the plank and provide it with hooks or suitable bolts. When using a puller, a ball should also be used, as this significantly reduces the effort expended when pressing out parts.

We add that in order to improve the methods of repair and refinement of motor engines, members of our circle have developed, manufactured and put into operation various simple devices in recent years, which greatly facilitate the disassembly and assembly of components, preventive maintenance and repair.

Author: O. Schlumper

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