Some drivers are well experienced in shifting manual transmissions. To them, gear shifting is second nature. Other drivers see it as a hassle, so they rely on automatic transmissions.
Owners of automatic transmissions don’t worry about not shifting gears properly and the clutch issues that may arise.
Failed clutches can result from poor gear-shifting habits on heavy or hilly congested pavement. So, if your transmission is slipping, how do you know if it’s from the clutch?
In this article, we’ll explain clutch slipping, outline clutch slipping symptoms, and how to fix clutch slipping issues. Let’s keep the ball rolling!
What is Clutch Slipping?
To understand clutch slippage, you first need to know how a manual transmission clutch works. A typical manual transmission clutch assembly includes four primary components: The flywheel, friction disc, pressure plate, and release bearing.
When the clutch pedal is depressed, the release bearing pulls the pressure plate away from the friction disc, resulting in the friction disc disengaging from the flywheel.
In this state, the engine is disconnected from the transmission, and rotational force cannot be sent to the drive wheels.
On the other hand, when the clutch pedal is released (foot off of the pedal), the pressure plate keeps the friction disc pressed against the flywheel. In this state, the engine is connected to the transmission, and rotational force can be transferred to the drive wheels.
So, what is clutch slippage? Clutch slippage occurs when the friction disc is not firmly held against the flywheel when it should be. When the friction disc slips, power flow between the engine and transmission is interrupted.
Although slippage usually results from a worn-out friction disc, other possibilities include insufficient clutch pedal free play, a weak pressure plate, and oil-contaminated mating surfaces.
Clutch Slipping Symptoms
The most common symptoms of a slipping clutch include rising RPMs without a corresponding increase in vehicle speed.
You might also notice a burning smell, reduced engine performance, or a change in clutch pedal height. In some cases, the clutch may disengage more quickly than normal.
Let’s take a closer look at the signs of a slipping clutch and what they mean for your transmission.
#1. Rising RPM, but Lack of Speed.
When the clutch slips, there’s a tell-tale indication based on the RPMs. You will see the engine RPMs rise, but you won’t get the speed that should come with it. Plus, the RPMs could go up much higher than they would if you were driving.
You may notice this problem when you go to pull out on a busy highway or you plan to pass another vehicle.
When you attempt to accelerate, the RPMs jump up quickly and the engine makes noise, but the car doesn’t speed up. Then, just as quickly as it occurs, it can be over and the car can move forward normally.
#2. Burning Smell.
As the clutch slips, you may also smell something burning coming from the front of the vehicle. This smell is generated from the excessive heat created by the disengagement of the engine and the slipping clutch.
To compare the smell you might experience, think of what overheated brakes smell like. The odor is similar because the materials are closely related. The more frequently the clutch slips, the stronger the smell becomes.
#3. Decreased Engine Performance.
Aside from the sporadic issues with the loss of engine power, it can also occur more frequently. If you are pushing your vehicle to the limits, such as when you are towing, you may notice that the engine doesn’t put out the power it should.
The engine needs to send power to the drive wheels, but this becomes difficult if the clutch is slipping. While the clutch is engaged, the engine is disconnected from the drive wheels, so it can’t send that necessary power.
You may not have the same level of performance problems during a regular highway commute, so it could be less noticeable in some circumstances.
It’s important to note that a lack of engine power doesn’t automatically point to a slipping transmission.
In fact, this symptom can be related to a multitude of problems. However, if you notice this symptom in conjunction with others, it’s worth considering that the clutch is slipping.
#4. Clutch Pedal Height Change.
If you spend a good amount of time in your vehicle, you are probably used to where the three pedals sit (clutch, brake and gas). When you push down on the clutch pedal and take your foot off, you know where the pedal is going to rest.
However, that height may change once the clutch begins slipping. It could come back to a position that’s too low or high.
You are going to notice that you have to put your foot in a different position to push it. In some cases, a simple clutch pedal adjustment is all that’s needed, but that won’t stop the clutch from slipping.
#5. Quicker Clutch Disengagement.
When the clutch works as intended, it can take one to two inches of depressing the clutch pedal before the engine and drive wheels disconnect. If you start to notice a change in this operation, the clutch may be slipping.
The engine may disengage after gently pushing on the clutch pedal, even if it doesn’t go down an inch. Even resting your foot on the pedal could cause the engine to disengage, leading to even more driving issues.
What Causes a Slipping Clutch?
There are a variety of things that can cause your clutch to exhibit signs of slipping which include driving styles and shifting habits. Here are the most common causes:
#1. Worn Clutch Disc.
Over time, the friction material on the clutch disc can become worn down. This reduces the ability of the disc to grip the flywheel and pressure plate, allowing it to slip when torque is applied through the transmission.
#2. Riding the Clutch.
Resting your foot on the clutch pedal while driving puts constant pressure on the clutch. This can cause it to overheat and slip. It’s better to fully depress the clutch when shifting and then fully release.
#3. Weak Clutch Springs.
The clutch disc is squeezed between the pressure plate and flywheel by springs. If these springs become weak or broken, they won’t apply enough force to prevent slipping.
#4. Launching From a Stop.
Quickly releasing the clutch and trying to aggressively accelerate from a stop places a lot of stress on the clutch components. This can lead to premature wear and slipping. Sure, burnouts can be fun but there are consequences.
#5. Low Clutch Fluid.
Clutches use hydraulic fluid to engage and disengage. If the fluid level is low, the pressure plate may not fully engage the clutch disc.
#6. Oil Contamination.
Oil or grease on the clutch disc can prevent it from gripping properly. A leak from the rear main seal could cause oil to contaminate the clutch.
#7. Overheating.
Excessive heat buildup, from heavy loads or riding the clutch, can glaze the clutch disc material reducing grip. This is commonly referred to as clutch fade.
#8. Poor Shifting Habits.
Not fully depressing the clutch when shifting, shifting to the wrong gear, or releasing the clutch too quickly can cause the clutch to slip as it tries to match engine and transmission speeds.
#9. Downshifting Incorrectly.
When downshifting, the engine speed needs to be increased to match the lower gear ratio before releasing the clutch. If the clutch is released before the engine speed increases, the clutch will slip.
#10. Towing or Hauling Heavy Loads.
Using the clutch to start from a stop with a heavy load in the vehicle can lead to overheating and slippage over time. The load puts additional strain on the clutch.
How Do You Diagnose A Slipping Clutch?
There are several ways to determine if the clutch is slipping. Here are a few tips.
- Push the clutch pedal down and let it back up. Is it engaging and disengaging normally? You should be able to feel it through your foot.
- Turn on the vehicle and push the clutch down. Put the car into gear. While you pull away from the parking spot, pay attention to how the car is moving. Everything should be smooth and efficient. If it hesitates, shakes or sticks, the clutch may be slipping. Make sure you try this in an empty place where there’s no noise.
- Listen to the vehicle while you are driving. If there is squeaking or grinding when using the clutch, it could be slipping.
- You also want to pay attention to any burning smell while using the clutch.
- If the vehicle doesn’t speed up, but the RPMs jump up, you know the clutch is slipping.
Whatever testing you do, it’s best to have the system looked at if you notice any strange symptoms.
How Do You Fix A Slipping Clutch?
Replacing a clutch is a challenging task because of the weight of the transmission. It can cause severe injury to the laborer if it slips off from the sitting. To avoid sustaining injuries, you need to be extremely careful when fixing or replacing the clutch.
The process of replacing a clutch is determined by the type of wheel drive your vehicle is equipped with. We’ll classify the wheel drives into rear and front-wheel drives.
Let’s look at the procedures involved in replacing a rear-wheel-drive clutch.
Rear-wheel drive
You need to keep a few things in mind when replacing a rear-wheel-drive clutch. The bell housing, driveshaft, and transmission have to get out of the way to access the clutch. Also, you need to install the clutch in perfect alignment so the input shaft will socket easily.
Before taking off the transmission, disconnect the vehicle gear shifter from the interior. Catch the transmission fluid with a drain pan when removing the driveshaft.
Here’s the deal. Once the transmission is out of the way, do these;
- Detach the clutch from the flywheel and reinstall a new one.
- Inspect the flywheel and resurface it if necessary. If you notice heat discoloration, grooves, warping, oil residues, or wear and tear, it’s necessary to resurface the flywheel.
- Install a new throw-out bearing if you haven’t changed it in a long while.
- Inspect the pilot bearing. It is located near the rear main seal. Inspect and replace the bearing if you have covered several miles.
Front-wheel drive
Replacing a front-wheel clutch is a more tedious task. On front-wheel vehicles, the entire engine and transaxle will need to be pulled out. You need an engine crane to lift and support the engine so you can easily pull out the transaxle.
Preventing Clutch Problems
The best way to deal with clutch problems? Don’t let them start in the first place. Many of the early signs of clutch slipping can be delayed—or avoided entirely—with smart driving habits and simple maintenance. Here are my top tips for extending your clutch’s life:
- Use proper clutch technique: Always press the pedal fully when shifting, and never rest your foot on it. Riding the clutch is one of the fastest ways to cause premature wear.
- Avoid excessive load: Don’t lug your engine by trying to accelerate in too high a gear. That strain shows up later as classic signs of clutch slipping.
- Check your fluid regularly: Low or dirty hydraulic fluid can cause engagement problems that mimic clutch failure. Stay ahead with regular checks.
- Don’t ignore the little stuff: Address minor shifting issues early. A soft pedal today could be a major repair tomorrow if it leads to true signs of clutch slipping.
- Drive smoothly: Easy, consistent clutch engagement reduces stress on the system. It’s a simple habit that pays off over time.
- Warm up properly: Give your transmission a few minutes to warm up in cold weather. Cold fluid doesn’t lubricate as well and can cause hard shifts or early wear.
- Shift only when needed: Avoid constant clutch use in stop-and-go traffic. Anticipate slowdowns and time your gear changes wisely.
How much does it cost to fix a slipping clutch?
The cost of fixing a slipping clutch depends on various factors. These include the type of vehicle you own (rear-wheel or front-wheel drive), the cause of the slippage, and the cost of the replacement parts. If the culprit is a worn-out clutch assembly, it will cost $700 to $2,000 for an experienced mechanic to fix it.
FAQs.
Q: Can a slipping clutch fix itself?
No. A slipping clutch is not a brake noise caused by a rubbing brake backing plate that can stop by itself once it files off the rubbing surface.
However, if you start driving gently when the clutch starts slipping, you may be able to extend the lifespan. There’s nothing like fixing itself. In any case, no matter how gently you drive, a slipping clutch can fail at any time.
Q: What does it mean when the clutch slips?
Clutch Slipping means a state where the clutch is engaging or disengaging without providing adequate torque and power to the drive wheels.
This could cause the clutch not to move, or at least not to move as it should. In layman’s view, it means a failed clutch due to wear and tear and lousy driving pavement and driving habits.
Q: Does slipping affect acceleration?
Yes. Worn or defective clutches cause loss of power, which equals loss of acceleration. If a clutch wears out over time due to friction, the clutch disc will not clamp the flywheel firmly as it should.
Clutch slipping doesn’t need to be evident for it to be tagged ‘slipping.’ One of the outlined symptoms of a slipping clutch above is higher RPM but lower speed – that’s acceleration issues.
Final Word
If you ignore a slipping clutch for an extended period, it will cause additional problems. The more a clutch slips, the more it generates higher heat, which leads to accelerated component wear.
Hence, it is crucial to watch out for the clutch slipping symptoms outlined above and fix it before it escalates to bigger repairs.
If you’re not familiar with Underhold component working principles, get a trained transmission expert to diagnose and fix it.