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Showing posts with label Transmission Diagnostic. Show all posts
Showing posts with label Transmission Diagnostic. Show all posts
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Noise While Moving in Two or More Gears

If there is a noise while you shift from two or more gears the reason is damaged input shaft bearings or main shaft bearings.

Reason for noise while moving in two or more gears

(1) Damage input shaft bearings or main bearings.


As indicated in the above problem, noise occurs when moving in two or more gears. The key here is "two or more" and this points to a problem with something inside the manual transmission which rotates at all times. Since the input shaft bearings and main shaft bearings rotate at all speeds, they are likely candidates for the cause of the noise. It isn't positively stating that this is the cause of the noise but rather that it's a likely cause. There is really no way of knowing for sure until the transmission is opened up and examined by a professional.

What to do?


Regardless of whether the problem is with the input shaft bearings or main shaft bearings (or whatever the cause), the transmission needs to be opened up and examined by a professional. If this vehicle is under warranty or a service contract, you're covered. Otherwise, you'll need to seek out a reputable garage specializing in manual transmissions.


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Squealing Noise When Letting Clutch Out


If there is squealing or howling when letting clutch out, the problem often indicates the following.

(1)Faulty throughout bearing or faulty pilot bearing

Let's examine each of these possibilities. While releasing the clutch pedal, the clutch linkage pulls something called a throughout bearing away from the pressure plate. The pressure plate is then able to press against the clutch disc causing the clutch to become engaged. Now, as the throughout bearing is being pulled away from the pressure plate, it is rotating. If it's faulty, it will often make some sort of noise (commonly that of a squealing/howling sound - as you indicated in the problem you chose).

In the second case, again, while releasing the clutch pedal, the clutch is engaging. This means something called the pilot bearing (connects the crankshaft to the transmission input shaft) will have stress on it. If it's faulty, it will similarly make a squealing/howling noise. By the way, if the noise is louder when driving up a hill as opposed to a flat road, it's more likely the pilot bearing is at fault.

What to do?

Unfortunately, there is no easy way around this problem other than having the clutch/transmission assembly opened up and examined by a mechanic. Hopefully, this vehicle is covered under either some sort of warranty or a service contract. If not, try to find a car repair shop which is very reputable.

Clutch Assembly


Related Article:
From a Stop Car Shake as Clutch Pedal is released
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From a Stop Car Shake as Clutch Pedal is released



Without a professional inspection of the transmission, it's hard to determine the exact cause of this problem. But the most likely cause of the problem is the following.

(1)Loose engine transmission bolts, or faulty clutch disc.

As mentioned, only a professional mechanic can determine the exact cause of this problem. However, the suggested causes are good guesses. Why? Well, in the first case, the engine/transmission bolts are of course necessary to keep the engine and transmission connected and stable.

If one or more of the bolts is loose, the transmission assembly will have a tendency to vibrate. This vibration will be most noticeable when the clutch engages from a stop (i.e. when the clutch pedal is released) and, as you indicated in the problem you chose, even cause the entire vehicle to shake.

In the second case, when the clutch pedal is released, the clutch disc is pressed against something called the flywheel. This allows the transfer of engine power to the transmission. If the clutch disc is faulty (e.g. warped, bent, loose), it will not make even contact with the flywheel. As a result, severe vibration will occur between the two parts which can be felt throughout the vehicle.

What to do?
In this situation, you'll really have no choice but to take this car to a repair shop and have the mechanic examine the clutch/transmission assembly. Hopefully, for your sake, this car is covered under some sort of warranty or a service contract. If not, try to find a reputable car repair shop specialized in transmission repair and bring the car for repair.
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Clutch Pedal Vibration - What's the Risk?

The clutch pedal vibration is a problem that should concern you when it happens while depressing the clutch pedal. It's not a simple problem as you think it is, it's a risk to continue driving your car with a vibrating clutch pedal. 



It will not only creates a problem on the car but also damage important components of the transmission, it starts as a small problem and become bigger as you continue driving the car with a clutch pedal vibration, this will result in a more expensive repair. Continue driving the car will also increase the risk of stalling. There are three possible reasons why would a vibration in the clutch pedal occurs.

Possible Reasons for a Clutch Pedal Vibration

(1) Loose clutch disc
(2) Loose pressure plate
(3) Loose flywheel

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To determine the reasons that cause the problem, the transmission assembly must be opened up. It is very difficult to determine the real cause of the problem without looking inside the transmission. usually,  cause if there is a clutch pedal vibration when the clutch pedal is depressed a loose clutch disc, pressure plate, or flywheel is the problem. These three components are somewhat connected to each other.

The clutch disc is fitted in between the pressure plate and the flywheel, the purpose of the clutch is to transmit or cuts off the power produced from the engine to the transmission.

The flywheel is a round plate that is coupled to the engine crankshaft, the crankshaft is the one that makes the flywheel runs. When the car is in gear the pressure plate presses the clutch disc against the flywheel this allows the engine power to be transmitted to the transmission. Back to the problem, if the clutch pedal is depressed the clutch pedal is released in this case if there is looseness on any of the above-mentioned parts the parts will wobble and that wobbling will be transmitted on the clutch pedal thus creates clutch pedal vibration.

How to correct clutch pedal vibration when the pedal is depressed

No other choice but to bring the car to a shop specializing transmission repair, probably the transmission will be opened up to determine the exact cause of the problem. This kind of work is expensive so make sure that the shop where you bring the car is a reputable one to avoid a low quality of work.


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Why is My Manual Transmission Grinding?

Why is my manual transmission grinding when shifting? Transmission is very complex parts that are why when there is trouble it is very hard to diagnose without looking at the actual transmission, the diagnosis mention in this article is just a possibility unless the actual transmission is inspected.


If there is grinding on the transmission when shifting to one particular forward gear the possible reason is that there is a problem with the synchronizer of that particular gear. What is inside the transmission is a device called the synchronizer, the purpose of the synchronizer is to bring the rotating shafts/gears together at the same speed for smooth shifting. If the synchronizer is faulty a grinding sound occurs and shifting will become impossible for that particular gear.


But if the grinding occurs only at first gear just after shifting from a stop and not during downshifting the possible reason is that there is too much clutch pedal “free play”. Free play is the distance of the clutch pedal movement before the clutch begins to disengage. If there is too much pedal free play even when the clutch pedal is press all the way down, the clutch is still not fully disengaged and will results in grinding sound when shifting into first gear. Check out: Noise While Moving in Two or More Gears

Manual Transmission Hard to Shift Into First Gear
From a stop, the manual transmission hard to shift into first gear, but no grinding sound is heard. If this problem happens to you it only indicates a severely misadjusted clutch linkage.

Read more: Manual Transmission Hard to Shift Into First Gear

Seek the help of the mechanic specialized in transmission repair to inspect the transmission, if the mechanic recommends tearing down the transmission do not agree without seeking a second opinion. The problem may be solved by simply adjusting the clutch pedal free play, mention this to the mechanic.

Transmission Grinding When Shifting

There is a transmission grinding sound when shifting in all gears. The reason is because the clutch is not releasing fully.


A/T Upshifts Trough Gear Too Early

From stop the upshifts trough gear occurred too early this is because of the transmission have wrong fluid level, a faulty electronic sensor, throttle valve  linkage or governor problem.


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Gear Shift Not Working for Automatic Transmission

Gear shift for automatic transmission is not working when the shift lever is moved the reason for this is a bad fluid pump or a gear selector problem.


Reason why gear shift is not working

Bad Fluid Pump
For the automatic transmission to operate properly, it is dependent on the pressure of the hydraulic fluid. The pressure is created when the fluid pump creates pressure when the pump is pumping hydraulic fluid throughout the transmission assembly. Now, when the pump is not working all the gears will not be working.


Have the car towed to a reputable car shop and ask the mechanic to check the fluid pump and repair if necessary, if the mechanic is recommending to tear down the transmission do not agree but instead seek first for a second opinion.

Gear Selector Linkage Problem 

The gear selector linkage is a transmission component that determines which of the gear range is going to operates. When the gear selector linkage has a problem such as out of adjustments or is broken then it will not operate properly and the gear will not respond when the driver move the shift level.

If this kind of problem happens you will not be able to dive your car therefore have it towed to a reputable car shop for checking, ask the mechanic to look into the gear selector linkage.

Manual Transmission Hard to Shift Into First Gear
From a stop, the manual transmission hard to shift into first gear, but no grinding sound is heard. If this problem happens to you it only indicates a severely misadjusted clutch linkage.

Read more: Manual Transmission Hard to Shift Into First Gear

Noise When Shifting into Two or More Gears

While driving and about to shift into two or more gears you will hear a noise coming from the transmission this problem happens because the input shaft bearing or the main shaft bearing of the transmission is damage.


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Transmission Popping out of 3rd Gear and High Gear

When shifting into the 3rd gear or in a high gear in particular, the transmission pops out. However the transmission shifts normal in other gears. The reason why transmission jumps out of gear is because the shift linkage is faulty or the movement of the shaft is excessive.

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Manual Transmission Components image credit

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Transmission Popping out of 2nd Gear

When shifting into the 2nd gear, the transmission pops out. However the transmission shifts normal in other gears, the reason why transmission jumps out of 2nd gear is that the shift linkage is out of adjustments or the shifter fork is loose.



Possible cause of transmission to pop out of 2nd gear
1. The shift linkage out of adjustments.
2. The shifter fork is loose.

Because the transmission is very complex parts when it comes to vehicle, it is very difficult to explain in detail what is going on in the transmission of why the transmission is popping out of the 2nd gear when the shift linkage is out of adjustments or when the shifter fork is loose. Just a simple explanation is that the shifter fork and the shift linkage have something to do of having the transmission staying on the gear. With that said if one of these components has a problem like out of adjustments or loose then it can cause the transmission to jump out of certain gear. All the causes mentioned above are just possibilities of why the problem occurs and there might be other cause in which can only be determined when the transmission is inspected in actual condition.

What to do when the transmission pops out of 2nd gear
If the car can be driven using different gear position then it is better because you can drive the car to the nearest car shop so that the mechanic can check the car, but if the car cannot be driven then have it towed to the nearest car shop.

Verify if the car is still under warranty because it will be covered and you will have problem on the cost of the car is not within the period of warranty, you are lucky if the car is within the specified warranty period set by the manufacturer because the dealer will take care of the problem and shoulder all the expenses that are incurred during the repair of the vehicle.

Having this kind of job on your car is pretty much expensive, if the car is not under warranty then you will shoulder all the expenses it will be a much expensive be need to bring the car to a reputable shop that specialize transmission repair, usually the mechanic will only need to adjust the shift linkage but if the problem is not fixed after the adjustments then the problem might be worst and the transmission is necessary to be inspected by a mechanic to determine the real cause of the problem.

Manual Transmission Hard to Shift Into First Gear
From a stop, the manual transmission hard to shift into first gear, but no grinding sound is heard. If this problem happens to you it only indicates a severely misadjusted clutch linkage.

Read more: Manual Transmission Hard to Shift Into First Gear

Noise when Moving in One Particular Gear

Noise is heard when shifting into one particular gear, the noise does not occur on other gears when shifting. This happens when the teeth of the involve gear is damage or the bearings of the involve gear is damage.


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Transmission Jump Out of Gear When Reversing

Transmission jump out of gear when the car is reversing. The gear wont stay when backing up this is because the shift linkage is faulty or the shift linkage is weak, other reason is because the shift rail spring tension is weak.

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Manual Transmission Components image credit

Howling Noise When Clutch Pedal is Release

When the clutch pedal is released there is a howling noise than can be heard coming from the transmission. The reason why howling noise occurs when the clutch pedal is release is the faulty throwout bearing or faulty pilot bearing.


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Grinding Noise when Shifting

When shifting into one particular forward gear grinding noise occurs. However, the grinding sound is not heard when shifting into reverse gear.

Possible cause of grinding noise when shifting

The transmission gear synchronizer is defective
If the grinding noise happens only when shifting into a forward gear then it is most likely a problem on the component of the affected gear which is the synchronizer. The synchronizer is a transmission component that brings the rotating shaft or gears together at the same speed when the car is running, the purpose of this is to smoother the shifting.

Now, if the synchronizer is defective there is a grinding sound that can be heard every time the transmission is shifted into the forward gear. When the defect of the synchronizer is severe the transmission is hard to shift or even worst then shifting to another gear will become impossible.

Manual Transmission Hard to Shift Into First Gear
From a stop, the manual transmission hard to shift into first gear, but no grinding sound is heard. If this problem happens to you it only indicates a severely misadjusted clutch linkage.

Read more: Manual Transmission Hard to Shift Into First Gear

There is too much free play on the clutch pedal
If for instance, the shifting problem occurs during shifting from a stop going into the first gear, it is most likely that the cause is related to the clutch pedal free play. Clutch pedal free play is the movement of the clutch pedal just before the clutch starts to disengage.

When there is too much clutch pedal free play it can cause for the clutch not to be fully disengaged when shifting into first gear coming from a stop even when the pedal is fully depressed, if this happened there will be a grinding sound heard coming from the transmission every time the gear is shifted.


Problem with the transmission is not an easy job it should be handled by a mechanic that is specialized in transmission repair, therefore the only option you have is to bring the car to a reputable car shop that is expert when it comes to transmission repair.

Since the problem happened only when the shifting is done from stop going into the first gear the mechanic may only need to adjust the clutch pedal free play, or sometimes the mechanic will recommend opening the transmission, in this case, do not always agree with the mechanic recommendation seek first for a second opinion coming from another shop, if the other shop also recommend that the transmission is necessary to tear down then that is the time to agree for the transmission overhauling.
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Grinding Sound When Shifting into Reverse Gear

When shifting into reverse gear a grinding sound is heard, the reason for this is that the clutch is not disengaging.

Possible Cause of Grinding Sound when Shifting into Reverse


The clutch is not disengaging
This kind of problem usually indicates that the clutch is not releasing fully. As you may already know when the driver changes gear the clutch is depressed so that the engine will disconnect from the transmission this is what the clutch does.


Now if the clutch is not disengaging when the clutch pedal is depressed a grinding sound is heard, this happens because the gear is in the clash with each other when you shift. There are other reasons for this kind of problem but the reason stated above is most likely the cause of this problem.

How to fix the occurrence of grinding sound during shifting into reverse gear

With this kind of problem no other option but to bring the car to a shop that specializes in a transmission repair. Tell the mechanic to check on the clutch linkage, usually, it may need some simple adjustments to fix the clutch from not disengaging and eliminate the grinding sound when shifting into reverse. Sometimes shifting into first gear before shifting into reverse gear can help.

Manual Transmission Hard to Shift Into First Gear
From a stop, the manual transmission hard to shift into first gear, but no grinding sound is heard. If this problem happens to you it only indicates a severely misadjusted clutch linkage.

Read more: Manual Transmission Hard to Shift Into First Gear

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