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Manual Transmissions
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A vehicles transmission allows for torque multiplication (which helps acceleration) and a wider range of vehicle speeds than would be possible if the engine were connected directly to the drive axle.
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A Manual Transmission has toothed gears that must be selected by the vehicle operator with a lever and connected to the output shaft of the transmission.
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Manual Trans input shaft and counter gear power flow.
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Input shaft and counter gear
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Manual Trans power flow: Neutral
Counter gear
Input shaft
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Power Flow: First gear
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Five Speed Transmission: Neutral
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Shifting rails & forks can be seen in this photo:
Shift rails
Shifting forks
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Shifter / Rail movements for each gear.
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View from front of trans
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Synconizers are needed to help gears rotating at different speeds mesh together without grinding.
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Synchronizer assembly
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Syncro collar or hub
Sliding sleeve
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Synchronizer ring and gear
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Synchronizer assembly
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Another small gear is needed to reverse the direction of the output shaft.
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Typical parts layout
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Input , counter and 1st,2nd, 3erd gears. Very expensive to replace!
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Special tools
Tools required to work on Manual transmissions:
Snap ring pliers Pullers Feeler gauges Dial indicator caliper
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Good luck with unit test!