Holes in the clutch hub allows oil to reach all plates. If not, we can provide a different model but the right year, rebuilt to work perfectly until the right model becomes available. When the shift out of reverse is made, the check ball in apply line is lifted off its seat, permitting a fast discharge of oil from the servo cylinder. The function of the turbine assembly is to absorb energy from the oil projected into it by the pump and convert the energy into torque as determined by engine speed and load conditions. I always start off in Drive and would only use Low if ascending a very steep hill.
Oil entering the cylinder pushes the servo piston upward against the outer end of the band operating lever, causing the band operating lever to pivot and force the strut against one end of the low band. When the shift control lever is moved to Low L , the control valve is moved into position to pass oil to the low servo which applies the low band, also to pass oil to the low boost chamber in the pressure regulator valve body, thereby increasing the apply pressure to 160-180 psi as previously described subparagraph b. The transition through the various ratios of torque multiplication is smooth and devoid of steps or change points since it is accomplished without the use of selective gears. The stator blades have curved surfaces which control the flow of oil between second turbine exit and pump entrance when the turbine is stationary or at low speed relative to the pump rotation. The front oil pump would be sufficient for all normal operation with engine running. The torque converter is connected to the engine flywheel and serves as a hydraulic coupling through which engine torque is transmitted to drive the car.
These components are described in the following subparagraphs a, b, c and their relative positions are shown in figure 4-43. If you want to hold it in each gear you start off in L, wind it up and shift to D, that puts it in second gear, now pull it back into L and that holds it in second, wind it up again and shift to D and you are in third. Two oil pumps are used to provide oil circulation and pressure and valves are used to regulate and control the oil pressure. Reaction force causes the recoil of a fired gun, the flight of a rocket, and the flight of a plane equipped with a jet engine. Each low planet pinion meshes with a reverse planet pinion, functioning as an idler pinion to cause the reverse planet pinion to rotate in the same direction as the sun gear.
The direct drive clutch locks the planetary gears to provide direct drive without gear action, when 1957 Buick Dynaflow transmission is in Direct Drive D. If I have them or can get them I will list them for you. There is a chance of replacing that strut without removing the trans. We also have adapters to mount other Chevy automatics behind the Nailhead but the ones listed above should be your first choice. The piston is free to move on the rod as it compresses the preload spring until the hub of piston contacts the spring retainer.
We can build conversion units as well, for upgrading or better choice or availability. The reverse band surrounds the reverse ring gear so that when the band is applied by the hydraulic control mechanism the ring gear will be held stationary. This torque converter, as with all earlier and later Dynaflows, was operative if the the selector was in drive, low or reverse. These units are not shown in figure 5-2. The direct drive clutch locks the planetary gears so that no gear action can occur when direct drive is required. I always start off in Drive and would only use Low if ascending a very steep hill. Construction and operation of all hydraulic control units are described in paragraph 5-8.
The 1957 Buick Dynaflow transmission output shaft, which is splined to the universal joint, is splined with the planet carrier to make a unit assembly. What if you're on a trip to a tour and it goes bad. All engines have a horsepower and torque peak. The described build-up of forces produces a turning force or torque upon the turbine which is much greater than the torque produced by the engine; therefore, torque multiplication is accomplished. Has anyone else heard the same? While ultimately no match for these improved gearboxes, the Dynaflow did prove to future carmakers that the future of automatic transmissions lay in torque converters, a fact that has been borne out time and again in the years since.
As explained later subparagraph e , reverse is obtained by holding the ring gear stationary. The amount of energy in the oil thereafter projected from the pump becomes the sum of the energy in returning oil plus the energy resulting from engine torque application, or almost double the amount of energy that could be generated by engine torque alone. When the shift out of reverse is made, the check ball in apply line is lifted off its seat, permitting a fast discharge of oil from the servo cylinder. A spinning flywheel has stored up energy turning force which may be transmitted to any mechanism which opposes its rotation. The shift control lever must be raised to shift into Reverse. The direct drive clutch locks the planetary gears so that no gear action can occur when direct drive is required.
The Dynaflow has no low in Drive, it just has high torque multiplication when the pump is moving much faster than the turbine or turbines. With increased speed, the pump now projects a large volume of oil into the turbine at high rotary speed. A custom convertor will have to be built but it is a very neat and tight package when it is done and looks like like it was made for it. Always install a external aftermarket oil cooler so that the hot or warm side coming from the trans to be cooled goes to the aftermarket cooler first, and then routed to the radiator oil cooler. Both the low range reaction gear and the reverse ring gear are free to turn so that the reverse planet pinions cannot react against either gear. The front line feeds the high and low drum bushing and all clutch plates. The cylindrical regulator valve has three lands which control passage of oil through ports in valve body.