Gearbox whine

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Gearbox whine

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They are, at best, inconvenient and, at worst, very expensive. Transmission problems, if not fixed, will inevitably become worse, and there are some early indications that you should have a mechanic check out your vehicle. The following can be signs of a bad transmission:. Check Engine Light comes on : Your Check Engine Light is the first indication that something has gone wrong, or is about to.

It can mean any number of things, including transmission problems. There are sensors throughout your vehicle that tell the on-board computer if anything unusual is happening, and a number of those sensors are located on your transmission. They can pick up the tiniest vibration or jerk that you might not even feel. Never assume that your Check Engine light has come on for no reason. Clunking, humming, or whining : Transmission noises can be hard to identify, but they usually sound like whining, humming, buzzing or clunking.

These are all indications of transmission trouble. With a manual transmission, the most common red flag is grinding when you shift. If it happens after you engage the clutch and shift, it could also be a sign of a faulty clutch. Either way, you need to get it checked. Again, get it checked.

Noise in neutral : If you notice a bumping sound when your car is in neutral, the problem could be as simple as low or dirty transmission fluid. Low or leaking fluid : A transmission fluid leak is one of the most reliable signs of a transmission problem, and should never be neglected. If you allow it to continue to leak, you could cause irreparable damage to your transmission.

You can identify leaking transmission fluid easily. If the fluid looks dark or has a burnt smell, then your mechanic can drain it and replace it with new transmission fluid. It could also be a problem with the clutch linkage, the shift cables, or the computer system. Burning smell : Obviously, if you smell something burning, you should act immediately.

gearbox whine

Eliminate the possibility of fire, and then consider other causes. This happens when the fluid breaks down due to debris and sludge. The clutch is still spinning, and changing gears will be difficult, if not impossible. Slipping gears : Your transmission is supposed to stay in one gear until you shift with a manual transmission or the computer does it for you with an automatic transmission. If the transmission is slipping in or out of gear without any effort on your part in a manual, or sliding into neutral in an automatic, you need to get to a mechanic immediately!

This is a huge safety issue, because if you need to hit the gas to avoid a dangerous situation, and you have no power to your wheels, the results could be catastrophic. The most popular service booked by readers of this article is Transmission fluid is leaking Inspection. Our certified mobile mechanics make house calls in over 2, U. Fast, free online quotes for your car repair. Schedule Transmission fluid is leaking Inspection. Service Area. Average rating from customers who received a Transmission fluid is leaking Inspection.There is a whine in fifth gear unless the car is coasting.

The salesman said "it is a town car and fifth gear hasn't yet been run in", but my suspicions are that fifth gear has a problem. Her previous car was also a Agila in which she did k miles from new before the engine lost power and became noisy. Road tax rise. Honda Jazz - is the price right? Mazda MX-5 automatic search. BMW sports seats a strain in the neck. Ford Mondeo tyred out. Splash out on a Suzuki.

It might simply need the transmission oil level topping up. But a whine is usually a worn bearing and need not be a disaster. Email your queries to letters honestjohn. More Honest John articles. Terms and Conditions. Style Book.

Weather Forecast. Accessibility links Skip to article Skip to navigation. Thursday 02 April Whining gearbox remedy Whining gearbox in Vauxhall Agila need not be a disaster, says Honest John. By Honest John. A friend bought a Vauxhall Agila with 24k miles on the clock.Advanced simulation techniques from Romax Technology eliminate gear whine problems in automatic transmissions.

The intrusive noise known as gear whine is caused by vibrations generated by gears as they mesh as a result of imperfections caused by design, loading, temperature effects, and manufacturing variations. Reducing gear whine noise to an acceptable level is a big challenge, especially for complex gearboxes like the modern planetary automatic transmission. Advanced design, simulation, and analysis tools like RomaxDesigner give engineers the ability to quickly and accurately identify problems, find the root cause, and propose realistic solutions within the allowable design constraints.

With such a tool, existing designs can be optimized to remove noise problems, and new designs can be created that are known to be problem-free even before any metal is cut. Here we develop a process for optimizing an existing design to reduce a noise problem and show how it works with a real-world example.

Gear whine does not have to be loud to be a problem.

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It is by nature a tonal noise, which is annoying to drivers and passengers because it cuts through other noises in the vehicle interior. Perfect gears in a perfect operating environment produce no noise, but unfortunately we do not live in a perfect world.

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The real world is one of manufacturing and assembly tolerances, and components that deflect under the loads we put through them. TE causes a vibration at the gear mesh which is transmitted through the internal gearbox components to the housing, where it is radiated directly as noise or transferred through the chassis in the form of vibrations to be radiated as noise elsewhere.

Although not the sole method of controlling gear whine, reduction of the noise at the source by reducing TE is clearly a good idea. The usual way of adjusting TE is through making changes to the tooth surface on a microscopic level. You also need to consider that any micro-geometry changes you make will also impact the durability and efficiency performance of the gearbox.

It is no good having a quiet gearbox that breaks after 50, km. A quick glance at Figure 1 will tell you that a modern automatic transmission is a complex beast, with many gears meshing simultaneously.

These complexities make it difficult to predict the gear meshing behavior and to identify the optimal micro-geometry modifications necessary. The only way this can be achieved is by considering the gears within the context of the complete transmission. The effects of and interactions between all these gears mean that a system-level simulation such as that provided by RomaxDesigner from Romax Technology a quick and accurate virtual product development tool with the capability to simulate, analyze and optimize the NVH, durability and efficiency performance of the most intricate designs is a necessary tool in the process of making these gearboxes quiet.

Common gearbox problems and diagnosis

Quick and accurate simulation of these complex behaviors is the key to an improved product. Obviously accuracy is important; we need to be able to trust the results and make design decisions based on them. When this is combined with fast computational performance it becomes an enabler for all kinds of useful analysis and optimization methods that rely on repeated simulation of subtly different designs, as we shall see later.

Optimizing the design of multi-mesh planetary gearboxes presents a number of problems when compared to simpler manual transmission designs, which means that specific methods have had to be developed by Romax Technology to deal with automatic gearboxes. A planetary automatic gearbox is complex with many components.

To simulate it we need to represent that complexity but only to a level of detail that is necessary to give us the results we need—we do not want a cumbersome model that takes a lot of computer time to run, but we do need to include detail where it is important.

For example we need a very detailed description of the gear geometry and a detailed model of gear tooth contact, but we only need to consider the simulation of brakes and clutches on a concept level.

We also need to include the effect of the gearbox boundary conditions whether in the vehicle or on the test bench so that our model represents what we are actually testing.Whining noise when accelerating is annoying. It makes you cringe every time you start the car because the noise is likely to disturb the neighbors. Why does this happen and how to get rid of this embarrassing problem? With frequent use over time, many car components wear out and start showing issues.

A car that makes such a weird noise at the time of acceleration, will be fine at a set speed.

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It is actually challenging to find the root cause of whining noise when accelerating but these common causes will give you the heads-up. You should do a thorough transmission check-up when the car starts making a grousing sound when speeding up.

It could happen because of low transmission fluid level or worn out gears. Low level of fluid can cause all sorts of problems, and bizarre noises are the first to start with. Spotting this problem and refilling the fluid can save you plenty of money down the road. On the other hand, if the noise does not begin unless the vehicle is in motion, there must be issues with one or more gears and bearings.

Planetary gear sets will create a whining sound when they are worn out but only when the car starts moving. Repair or change the gear components if they are damaged. A loose steering belt could be the culprit behind a whining noise when accelerating. When it happens, the sound will occur when you are turning the steering wheels.

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Tightening the belt will solve this issue. A leak in the power steering system can start that annoying whining noise. If you discover drips under your car or a visible drop in the level of power steering fluid, there must be a leak. Look into the steering rack or gear because these are the places where the leak is likely to occur than in the pump. You can replace the damaged or leaked parts and refill the fluid to fix the problem.

The easy fix is to add a liquid stop-leak solution to the reservoir. There are plenty of good-quality products in the market that offers a simple, quick, and inexpensive solution than replacing components. After adding the stop-leak mixture, fill up the reservoir with power steering fluid.

The rising noise in the car can indicate an engine problem too. The engine has a complicated mechanism and it is better to go to a mechanic for its diagnosis. But, you should do that only after being sure that the trouble is with the engine, not with the transmission.Some forums can only be seen by registered members. You can hear the engine speeds change, but you cant feel the shifts and no its not slipping.

With that out of the way, I took ownership of my Pontiac 9 years ago.

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The day I took possession from grandma the transmission has had a "whine" in first gear. When it shifts to second, it goes away. I changed the fluid and filter last year and it didnt change it. It has done this for NINE years and has never failed me. I was told it sounded like the pump was getting weak, but NINE years of driving with this whine, it must last a long time when its weak. Now its getting to where I am annoyed by the sound and wondering if LUCAS transmission additive would help tone this sound down, or is it only good for leaks and slippage, which neither are things this tranny does.

It dont slip or leak, only has the whine. Wondering if its a waste of money for the Lucas or should I live with the whine from gear? Omaha Rocks. Location: I think my user name clarifies that. I really like the Lucas additives. The tranny stuff certainly isn't going to hurt anything, but I have my doubts as to it quieting down your first gear. Lucas is good for the valve body anyway and will help to boost pressure in the clutch packs so it's not a waste of money.

Your whine is likely the planetary gears in the transmission--GM is in famous for this. My Caddy whines so loud people turn their head but, like your 9 year noise, shifts perfect and it's a lot of work or money to tear it down just so it won't whine. I'd drive it till the tranny actually starts to slip or have shifting issues and then build it with new planetaries. And turn up your radio until then.

Diagnosing Whining Noise When Accelerating

I should have been more specific to your question--Lucas will not silence your whine if it is the planetary gears. A good power flush that replaces all the fluid would probably do wonders. A slight first gear whine is normal.There are several reasons why an automatic transmission makes a whining sound. The transmission pump makes this sound as pressure increases with rotational speed. This occurs while stationary and increases as the vehicle accelerates. A clogged transmission filter creates a similar sound to a whining pump.

If the vehicle is low on transmission fluid, it can also cause a whining sound, accompanied by gear shifting problems and other habitual issues. A qualified automotive technician can locate the source of whining sounds and diagnose contributory mechanical issues. A part of preventive maintenance is to have the transmission inspected every two years or 30, miles, and to have a transmission flush performed. Transmissions contaminated with dirt and grease experience symptoms similar to transmission failure.

A flush removes the dirty fluids, grime and residue from the converters and cooler lines, and it replaces it with fresh fluids.

gearbox whine

In some cars, this enhances the function and preserves the life of the transmission. Keep in mind that some vehicles do not benefit from a transmission flush.

gearbox whine

Car owners need to follow the instructions of the manufacturer to ensure the vehicle receives the proper preventive maintenance. Home World View.

gearbox whine

What Is an Automatic Level?Are you experiencing whining noise when accelerating your car to high RPM speeds? This seems to be a common problem with many cars. In this article, I present some of the possible causes of whining noise while accelerating. Is a whining noise while accelerating, disturbing your peaceful meditative state at the driving wheel? Whining noise while accelerating seems to be one of the most commonly faced and most discussed problems on automobile forums worldwide.

Some report a whining noise from engine, some report it to come from the front right or front left and some are plain clueless about it.

What makes the whining even more mysterious is the fact that it occurs only at high engine RPM or while accelerating.

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Would you like to write for us? Well, we're looking for good writers who want to spread the word. Get in touch with us and we'll talk Friction and vibration are two factors that come into play at high car speeds.

With a plethora of operational moving parts, figuring out the culprit contributing to the car making whining noise is difficult even for experienced car drivers. One way out is to check for all likely possibilities, one by one. To figure out why a car makes whining noise while accelerating, make a list of all possible causes and eliminate through investigation, till you can narrow down to a single one.

In the next section, I provide a list of possible causes of whining noise during acceleration, that I discovered from various automobile forums and experienced auto mechanics. Possible Causes I list out the various reasons why your car can become a whiner at high acceleration speeds. One clue is to figure out what parts of a car come into play at high acceleration speeds. Here are some hints. Transmission Problems One of the prime reasons for whining noise may be friction caused in the car transmission mechanism.

The reasons for this might be worn out gears and low transmission fluid levels.


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