189
The upper ends of both springs thrust against plate (5) which in its turn rest on split taper copper-plated
retainer (4) entering the groove in the valve stem. The inlet valve retainer surface is copper plated, that of the
exhaust valve is brass plated.
The exhaust valve is made of steel 4Ch14N14V2M and its mushroom-type head is convened towards the
combustion chamber. The exhaust valve stem and mushroom-type head are filled to 2/3 its interior with metallic
sodium which melts on heating thug promoting heat transfer from hotter valve mushroom-type head to its stem, and
then through the stem guide bushing and cylinder head to the atmosphere.
Welded to the stem end of this valve is a piece of a more wear-resistant material, while the land is surfaced
with stellite VChN-1. The inlet valve land is made at an angle of 30° to the mushroom-type head plane, that of the
exhaust valve at an angle of 46°15«.
To preclude carbon deposit on the exhaust valve stem and valve sticking, a sealing and scraping device is
provided. The sealing and scraping device (Ref. Fig. 3) of exhaust valve (1) comprises two steel sealing rings (2),
spacing washer (9) located in steel bushing (3)«
Sealing rings (2) are split, thermally stabilized for constant compression of the stem, have an internal
tapered surface and are installed on the stem with the larger base of the tapered surface towards the mushroom-
type head of valve (1).
Longitudinal displacement of rings (2) is limited at the top with the shoulder of bushing (3) and at the
bottom with washer (8) pressed in bushing (3) whose flange is a support surface for inner spring (4) which
constantly presa the entire stack to guide bushing (5) of the valve. When the valve opens, sealing rinys (2) scrape
off oil from the step of valve (1) thus precluding formation of carbon, hence "hang-up" of the valve.
2.2. INTAKE PIPES
Intake pipes (Ref. Fig. 4) serves to -supply mixture from the blower to the cylinders. The intake pipes are
made of seamless pipe with flaring of the short elbow.
The intake pipe is attached to the cylinder by a nut screwed on the external connection. The pipe is sealed
with paronite gaskets installed in the end face groove in the connection.
The pipe lower end is installed in the mixture collector pipe, is attached by a nut and sealed with a rubber
ring.
Welded to the intake pipes of lower cylinders Hbs 4^5 and 6 are threaded bosses for plugs intended to
drain oil or gasoline from the pipes to preclude hydraulic shock.
2.3. PISTON
The piston (Ref. Fig. 5) takes up gas pressure and transmits it through the connecting rod to the
crankshaft.
The pistons are stamped of aluminium alloy, machined externally and partially inside.
The piston head is flat and polished on the outside. The outer surface of the head is provided with two
recesses under the valves to preclude collision of the piston with the valves in case the latter stick in the open
position and when the crankshaft is turned at maladjusted timing mechanism of the engine.
The side outer surface of the piston has five turned grooves: four grooves in the top band and one in the
lower band. The grooves are intended to receive piston rings.
Three top grooves receive keystone compression rings chrome-plated on the external diameter, while the
fourth groove receives an oil ring with slots and channel, and the fifth ring receives a bevelled oil slinger.
The fourth groove has oil drain holes through which the oil scraped off the cylinder walls is drained to the
crankcase.
Arranged inside the piston are two diametrically opposite bosses with holes to receive a piston pin.
Depressions are milled near the boss holes on the outer surface to decrease piston weight; holes are drilled in the
depressions for additional removal of oil from the cylinder walls.
The piston pin is made of chrome-nickel-tungsten steel. It is hollow and heat-treated to high surface
hardness. The pin floats in the piston bosses and in the connecting rod small end.
The pin is precluded against longitudinal displacement in the piaton by two aluminium plugs. Each plug has
six drain holes and three holes for lubricating plug outer surface.
Piston rings are made of alloyed cast iron. The key-atone compression rings feature a cylindrical generatrix
with porous chrome plating. Turned along the outer generatrix of the oil control ring is a groove with twelve slots to
drain oil.
The oil slinger has a bevelled outer generating surface. The oil slinger is installed on the piston with the
cone smaller base towards the piston head.
The pistons with rings and pins as well as working surfaces of cylinder sleeves are lubricated by squirting
oil through a jet driven into the web of the crankshaft front section and through gaps in the crank mechanism.
Содержание M-14P
Страница 6: ...19 Engine M 14P Front View Figure 1...
Страница 7: ...20 Engine M 14P Rear View Figure 2...
Страница 27: ...40 Arrangement of Airborne Tools in Case Figure 1...
Страница 39: ......
Страница 44: ...57 Engine M 14P Test Run Chart Figure 201...
Страница 67: ...80...
Страница 163: ...176 Crankshaft Thrust Ball Bearing Front Cover Figure 1 Intermediate Crankcase Figure 2...
Страница 166: ...179 Intermediate Grankcase Front Portion Figure 3 Intermediate Crankcase Rear Portion Figure 4...
Страница 173: ...186 Front view Cylinder Figure 1 Rear view...
Страница 174: ...187 1 Inlet Valve 2 Outer Spring 3 Inner Spring 4 Split Retainer 5 Valve Plate Inlet Valve Figure 2...
Страница 178: ...191 Intake Pipe of Cylinders Nos 4 5 and 6 Figure 4 Piston Piston Rings and Piston Pin with Plugs Figure 5...
Страница 180: ...193 Timing Mechanism Schematic Diagram Figure 6 Cam Plate Figure 7...
Страница 189: ...Blower Longitudinal Section View Figure 1...
Страница 191: ...Rear view Mixture Collector Figure 2 Diffuser Figure 3...
Страница 194: ...1 Plate 2 Spring 3 Plate 4 Gear 5 Accessory Drive Shaft Blower Coupling Figure 4...
Страница 204: ...Oil Sump Figure 4...
Страница 216: ...Engine M 14P Gear Train Figure 1...
Страница 247: ...Carburetor AK 14P Operation Diagram Figure 1...
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Страница 267: ...OPERATIONS AND TECHNICAL REQUIREMENTS CORRECTIVE ACTIONS CH ECKED BY Carburetor AK 14P Right Side View Figure 201...
Страница 273: ...Carburetor Altitude Control Needle Position Versus Barometric Pressure Barometric Graph Figure 203...
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Страница 288: ...T t en 0 CO 0 T K D fi h0 Ol f 01 3 0 F4...
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Страница 309: ...SPARK PLUG SD 49SMM MAINTENANCE PRACTICES 1 LIST OF TASK CARDS Title Task Card Uo Removal 201 Installation 202...
Страница 344: ...Generator Electrical Connection Diagram Commutator Side View Figure 3 1 Main Pole 2 Interpole...
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