What Are the Signs of Manual Transmission Problems?
Manual transmissions are designed to operate smoothly and efficiently. Although fairly basic in design, like with anything mechanical, there can be component failures. Most manual transmission problems start small and produce these types of symptoms:
Hard Shifting: Manual transmissions are designed to produce smooth, easy, controlled shifting between gear sets. When the clutch is activated during a manual transmission gear shift, the gears are designed to glide freely and smoothly from one gear to the next. If you cannot shift easily or if excessive force is needed to shift, that's a sure sign of a problem. In more severe cases, the ability to shift may not be possible at all.
Gear Noise: When manual transmissions are functioning properly and efficiently they rarely make noise -- at least excessive noise. A manual transmission that makes noise -- either during shifting or as the car is being driven at a constant speed -- is a sign that something within the transmission is not quite right. Although the problems may require only slight adjustment or repair, a noisy manual transmission is one that needs evaluation by a qualified transmission diagnostician. If your car makes grinding or scraping sounds during gear shifting, don’t ignore it, it needs attention immediately! Ignoring it will only cost you more money.
Gear Disengagement or Popping Out of Gear: Manual transmission gear disengagement occurs when a manual transmission gear moves or slips out of place. This condition causes a transmission freewheeling, which seriously affects your vehicle's operation. A manual transmission gear that slips out of place from a fixed gear position into neutral unassisted is a common symptom of a manual transmission problem.
Hard Clutch Pedal: A vehicle clutch is a very important part of manual transmission function. It’s what connects the engine to the transmission. A healthy clutch mechanism allows for the smooth, efficient shifting of the manual transmission. A clutch that is hard to press down on is a sign of a problem within the clutch, the clutch linkage or clutch hydraulics. With hard clutch pedal what you don’t realize is that more than likely the clutch is not disengaging all the way, which can lead to premature transmission failure. Hard clutch is a sign that the clutch may very well need attention.
Soft Clutch Pedal: Just as a hard-to-engage clutch assembly is a common symptom of a manual transmission problem, a clutch that is too easy to press down on -- or one that simply lacks enough tension is a sign of a possible problem within the clutch. Although a soft clutch is easy on your calf it sometimes is caused by clutch pressure plate that is worn out or simply a clutch that needs adjustment. In either case hard or soft clutch pedal needs to be looked into.
Signs Your Clutch is Not Fully Engaging or Engaging At All:
- When accelerating, the speed of the vehicle does not seem to follow engine RPM proportionally.
- Burning smell
- Drop in gas mileage
- Extremely soft clutch pedal
- Car does not want to move at all when letting out the clutch
Signs That Your Clutch is Not Fully Disengaging or Disengaging At All:
- Difficulty shifting from gear to gear (usually effects all gear changes)
- Grinding or scraping noise between gears
- Although getting into reverse is generally more difficult, when a clutch is not disengaging fully, reverse can become next to impossible
Other Signs a Clutch Issue Might Be Present:
- Chattering or jerking sensation when releasing the clutch pedal
- Crunching noises or a “hard” clutch pedal
- General tip for shifting into reverse: always move the shifter to a forward gear before moving to reverse.
Styles of Clutch Control:
- Hydraulic Type: Operates much like a brake system. There is a clutch master cylinder (connected to the clutch pedal), clutch slave cylinder (connected to the clutch fork) & hydraulic lines that connect the two. Hydraulic tends to be the most common we see from vehicle manufacturers. It is more common in later model or newer model vehicles.
- Cable Type: Simply put, a cable connects the clutch pedal to the clutch fork. The next most common type used by automobile manufacturers.
- Linkage Type: Uses a series of rods and pivot points to connect the clutch pedal to the clutch fork. Less commonly or hardly used any more, it is generally associated with older vehicles. Linkage types tend to wear out, need repair and frequent adjustment.
All three styles generally have some sort of adjustment that can be performed. As simple as they seem to operate, we see a considerable amount of people that get a major transmission replacement or a major clutch repair, when all they needed was a minor clutch adjustment or repair.