Design History:
The UCTKAM Model 2.5 D was Designed and Manufacturer in the U.S.S.R. (C.C.C.P.) around 1968; was evolved from the Uctkam-1.
Design Features:
classical configuration diesel;
steel cylinder liner;
cast iron piston;
fixed type carburetor (without speed control);
induction front rotary valve (crankshaft);
plain bronze bearing supported crankshaft;
schnuerle scavenging engine of high quality construction
Specifications:
2.47 Displacement d.c. (0.151 cu. In.);
bore 15 mm. (0.591 in.);
stroke 14 mm. (0.551 in.);
Observations:
This engine was acquired from a friend living in Lithuania but there were a number of problems which resulted in it not being a very good runner
Condition as received: there was excessive radial play of the shaft at the main bearing; it also had very poor compression and, tuning at the inlet slot in the shaft resulted in timing errors being introduced
Below: the reassembled engine is looking good after its extensive rebuild project; for full details on this project are documented in the eBook, check below for details on how you can get your own copy.
The engine in the test stand ready for that first run with a big propeller fitted and a rich fuel setting to flush out any loose particles and seat in the moving parts
Below: pictured are the MK1 (our engine) and the MK2 'Powerhouse" (1 HP @30,000 RPM) which will be a future feature engine
* Brass is an alloy of copper and zinc; the proportions of zinc and copper can be varied to create a range of brasses with varying properties.
In comparison, bronze is principally an alloy of copper and tin. Bronze does not necessarily contain tin, and a variety of alloys of copper, including alloys with arsenic, phosphorus, aluminium, manganese, and silicon, are commonly termed "bronze". The term is applied to a variety of brasses and the distinction is largely historical.
Observations continued:
http://www.youtube.com/watch?v=f-K9i-5Atgg
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Uctkam 2.5 cc MK 1 Rebuild Project
Table of Contents
Uctkam 2.5 cc MK 1 Rebuild Project
Table of Contents
Item | Title | Page Number |
1 | Engine data | 4 |
2 | Making and installing new main journal bearing | 6 |
3 | Attempting piston expansion by heating | 16 |
4 | Finish machining bronze bushing for press fit | 18 |
5 | Making a new piston and wrist pin | 24 |
6 | Piston lapping procedure | 27 |
7 | Repairing engine timing | 28 |
8 | Cleaning parts prior to assembly | 29 |
9 | Running-in procedure | 30 |
10 | Final observations | 33 |
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