On the rear end of the left arc, before the welding of the bottom cage, put the two parts: a ring of steel wire with a diameter of 6 mm and the starter pulley. The first tack-welded by the welding and is designed to limit the stroke up to the second, and the second, freely moving through the arc to start the engine with the cord. Ring for easy glide pulley periodically covered with grease “Litol-24”.
With the help of a pulley the engine is started in the following way. The driver wound on the flywheel the starter cord (one and a half to two turns), raises all the way to the ring pulley, imposes on him the cord and gently, but with force pull it to himself. The engine begins to run, the cord jumps off the pulley and that under the action of gravity falls in an arc down, occupying its transport position.
The engine (cylinder down) is attached to the motor frame by four bolts M8x1. 5 via spring — a rubber bushing inserted in the upright cage. Nuts bolts zaspirtovanny. Similarly to the case of snowmobiles, to be exact — to the brackets on reinforced stringers, attaches itself the motor frame.
In the same way — through the rubber grommet shock absorbers, only splintering steel fingers with a diameter of 6 mm is bolt — fastened to the motor frame struts aerodynamic fins.
The engine of the snowmobile “Otter” — petrol, single cylinder, two-stroke power 18 HP And most importantly — homemade, made of components and parts various boat, motor and starter engines.
The CRANKCASE is cast from aluminum alloy AL2 setting the dimensions of the crankshaft from the starting engine PD-10M and has a similar “pleskachevskogo” Carter connector, tightened four bolts M8x1. 5 (in two planting holes are inserted steel control sleeve defining precision Assembly Carter) and two screws M6 (bottom).
Pollicina groove landing surfaces crankcase parts was carried out on a lathe with the use of simple tools.
Main technical characteristics of the snowmobile “Otter”:
Width, mm…………………………………… 1460
The height of the air screw, mm…… 1647
The diameter of the propeller, mm………. 1200
Full weight, kg……………………………… 180
Specific pressure on the snow, kg/cm2…..0,026
Maximum speed, km/h……………..70
Cruising speed, km/h………………..35
Engine power, HP……………………. 18
The stock fuel tank, l…………………………5
Powerplant snowmobile “Otter”:
1 — the body of the snowmobile; 2 — fuel tank (plastic canister with a capacity of 5 l); 3 — air cleaner to carburetor; 4 — magneto M24; 5 — motor; 6 — rotor; 7 — cylinder; 8 — arc motor frame; 9 , the starter pulley
1 —arc (pipe 22×2, 2); 2— cross member (tube 22×2); 3 — solitaire (steel, sheet s2, 4 pieces); 4 — yoke engine mounts (tube 22×2, 4 pieces); 5 — a clip of fastening of a strut of aerodynamic keel (pipe 16×2, L20, 2); 6—Circlip (wire d6); 7—starter pulley (D16T, d70); 8 — clip fastening to the body of the snowmobile (tube 22×2, 4 PCs.)
The node mounts the engine to the engine frame:
1 —tide of the crankcase; 2 — rubber Bush; 3— a clip of fastening of the engine; 4-bolt М8х 1.5; 5 — cotter pin; 6 — washer; 7 — the engine cross member frame; 8 — solitaire
The fixing unit of the engine frame to the body of the snowmobile:
1. a motor frame; 2 — rubber Bush; 3,7—bolts M8x1,5; 4 — bracket (steel, strip s3); 5 — stringer under engine frame (70×20); 6— 3×20 screws (2 PCs): 8 — 25x25x3 washer with welded nut M8x1,5; 9 — pin
The attachment point of the aerodynamic keel to the motor frame:
1 . a motor frame; 2— brace (pipe 14x 1); 3 — keel, 4 — clip on the arc motor frame; 5—finger d6; 6 — fork brace (steel, strip s3); 7 — weld-nut M6; 8 — M6 bolt; 9 — washer; 10 — rubber bushing; 11 — pin
System manual start engine:
1 — flywheel; 2 — Circlip; 3 — starting pulley; 4, the starter cord
The fixing unit of the air vnta:
1 — engine flywheel (PD-10M); 2— screws M8 (6 PCs); 3 — locking (wire 01); 4 rotor; 5 bot M8x1. 5 (4 PCs); 6 — nut М14х1,5 with pin; 7 — flange (s5); 8 — hub
The hub of the propeller:
1 — nut M8 (6 PCs): 2 — housing hub; 3 – bolt M 14×1,5
The mechanism of the throttle (“gas”) carburetor:
1 — handle course (with the button “stop” of the engine); 2,7— stops sheath “gas” (area 20x20x5); 3,8—conduit “gas”; 4—the grommet (rubber); 5 — lever “gas”; 6 — wire throttle
The layout of the engine parts in the crankcase:
1 — the rear part of the crankcase; 2 — stud M10x1,5 for cylinder mounting (4 PCs); 3 — rod of the piston (from the engine PD-10M): 4 — front sump; 5 — coupling the drive magneto (PCB); 6— segment dowel 5×9; 7 — clutch ignition timing; 8 — fastening screw M6 magneto (3). 9 — fastening screw M6 semi-clutch; 10,17 — cuff 1-30×52-1; 11,16 — bearings 2206; 12 — spacer washer (3 PCs.); 13 — a cranked shaft; 14 — gasket; 15 — the bearing 206
The device of the button “stop” of the engine:
1 — pressure plate element (plastic); 2 — spring; 3 — body; 4 — contacts (copper); 5 — screw (3 PCs); 6 — handle (rubber); 7 — lever; 8 — cable; 9 — bushing-insulator
The layout of the engine (operating position of the engine on the engine frame cylinder down):
1 —flywheel (engine 11Д-10M); 2,3,4 — cylinder liner, cylinder and cylinder head (from a motorcycle “IZH-Planeta-3”); 5 — ignition plug; 6 — piston (engine PD-10M); 7— carb-TO-36И; 8 — inlet connector (“IZH-Planeta-3” or improvised): 9 — magneto M24; 10,12 — side of the crankcase; the crankshaft 11 (engine PD-10M)
The purge channels and all interior surfaces are carefully finished by hand.
The tightness of the crankcase seals and rubber reinforced cuffs.
The CRANKSHAFT, as already mentioned, from the “poscache”. To install the driver half of the coupling of the magneto front end modified: first, a little shortened; secondly, in his neck of the selected slot under the Woodruff key; third, drilled an axial hole with M6 thread for screw mounting of the coupling halves.
In the crankcase, the crankshaft rotates in three bearings: on the front shank it is wearing one bearing is a roller 2206, the rear two — roller 2206 and the ball 206. Channels the lubrication of all bearings is extended. In addition, the shanks wearing the three spacer washers 1 mm alsenoy: one in the front and two at the rear.
1 — back (aluminum alloy AL2); 2 — stud M10x1,5 for cylinder mounting (4 PCs); 3 — front (aluminum alloy AL2); 4 — bolt M8x1. 5 (4 PCs); 5 — installation sleeve (steel, 2); screws and bolts, tightening of the case, detailing not shown; dimensions are given taking into account the thickness of the gasket between the parts of the crankcase
Revision of the crankshaft
The FLYWHEEL is also from the PD-10M. The perimeter of its rear end drilled six holes with thread M8x1. 5 screws for attaching the hub To the last four bolts M8x1. 5 docked propeller. Screw heads and nuts to hub bolts scontrini in a circle of steel wire.
CYLINDER with sleeve, from the engine of the motorcycle “IZH-Planeta-3”, dragged to the crankcase by four studs M10. In the right side of the cylinder (in the lid of the overflow channel) drilled three holes: two M5 screw for mounting diaf-Rahmanova pump and one for the fitting the rubber hose, which is a cavity passageway is connected to the fuel pump.
PISTON with rings and piston pin is also from the PD-10M. Only the piston skirt cut extra Windows with a size of 30×30 mm.
The drive COUPLING of the magneto turned on a lathe from the PCB. Has a groove under a leash coupler ignition timing and the key groove.
MAGNETO type M24 with clutch ignition timing is attached to a specially molded to flange the front of the crankcase with three screws M6. From magneto to the engine button “stop” stretches the cable with two wires.
The working direction of rotation of the crankshaft is specified by the type of magneto (left or right rotation). And again. If you change the geometry of the front flange of the crankcase, magneto is easy to install the alternator from the motorcycle “Voskhod”. In short, there are different configurations of the engine of the snowmobile.
The INLET fitting of the carb homemade, too, although it is possible the use of a modified pipe from a motorcycle “IZH-Planeta-3”. It is important only that the operating position of the engine cylinder down housing cover of the mixing chamber of the carburetor is not in contact with the magneto.
FUEL PUMP mechanical — from the boat motor Neptun; manual Tickler, embedded in the hose of tract “fuel tank — carburetor” from the boat “Surf”. Carb — TO-36И with a simple cleaner.
Such is the design of the snowmobile “Otter”, which I enjoyed for several years. Without any — even small — breakdowns.
V. PETROV, Krasnoyarsk Krai
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