How Does My Manual Transmission Work?
If you drive with a stick shift, you have a manual transmission (also called a standard transmission). In a manual transmission system, your hand-operated shifter and clutch pedal select the gears and rpm values for your transmission.
In a manual transmission, the transmission is connected to the engine through the clutch and various gears and shafts. The driver uses the clutch to select gear ratios, which are applied to the input shaft to produce a different rpm value at the output shaft, or main shaft. The output shaft is connected to the driveshaft
, or drive axle, and the connection is secured with a drive axle seal
.
Most manual transmission systems employ 5 gear ratios. These systems are commonly called “5 speed.” Many vehicles, however, employ other gear ratios, and you may hear “3 in the tree” or “4 on the floor” in reference to the gear ratios of some classic vehicles. Sport cars usually employ more gear ratios than your standard commuter. Manual transmission systems also include a reverse gear and a neutral option in which the clutch does not engage the gears.
Common Manual Transmission Problems
Some common problems with
manual transmission parts can result in excessive noise and a slipping or sticking clutch. If your clutch is noisy or behaving funny, here are a few things to look for:
Noisy Clutch: Noise from your clutch can either be coming from the clutch itself or the rest of the manual transmission system, as the clutch system acts as an amplifier for other noise. A noisy clutch may indicate a bad clutch shaft pilot bearing, often the result of riding your clutch, too little pedal free-play, or that your clutch system needs lubrication for the following bearings: manual transmission countershaft bearing, manual transmission output shaft bearing
, or manual transmission mainshaft bearing
.
If your clutch is noisy in neutral, your vehicle may be telling you that it needs more lubrication, or that you have a worn reverse idle gear, worn bearings, or worn gear teeth.
Slipping Clutch: A slipping clutch can be the result of a worn pressure plate or clutch plate, too much oil on the clutch plate, insufficient pedal free-play or low transmission fluid.
Sticking Clutch: A sticking clutch may indicate that the gears and bearings need lubrication, the manual transmission shift linkage and manual transmission shift lever need to be adjusted, there is air in the transmission lines, or there isn’t enough manual transmission fluid
in the system.
Busted Shifter Parts: This is probably the most noticeable problem with your manual transmission system. Since the shifter sees a lot of action from your hand, it eventually wears out over time. The following parts commonly break and can easily be replaced: manual transmission shift emblem, manual transmission shift indicator, manual transmission shift knob, and manual transmission shifter housing. You can replace the parts individually when needed, or order a complete manual transmission shifter kit to start from scratch.
Whatever you think the problem may be with your manual transmission system, be sure to swing by your nearest auto shop to get the dirty details.
Common Manual Transmission Parts
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