Why does my manual transmission car make a loud whirring noise in reverse? Most of the gears in a manual transmission have helical teeth. The three gears that make up reverse have straight teeth. The large spur gear on the right slides up to put the car in reverse. Cite This! Try Our Sudoku Puzzles! More Awesome Stuff. There are more than one cause for this. It could be that a piece of metal is lodged on the wheels or transmission. As simple as removing the metal out or changing the affected part of your braking system can get rid of the issue.
Still, it is a must to be certain of the cause why your car is making a noise when reversing, and address the problem correctly. Here are the common causes of this problem and how to deal with it. Worn out brake pads that rub against the rotor can create noises when you are reversing. You may hear a clicking or a screeching sound. Other than the brake pads being worn out, it can shift to a completely opposite direction.
Hence, when the brakes shift, it produces a lot of noises. Also, the braking system has anti-rattle chips. From the term itself, you would know its purpose is to stop rattling. What you should first do is to get rid of the noises is to lubricate the brakes by applying disc brake caliper lubricant.
If the noises still persist, the affected part of the brakes should be replaced. During replacement, you should make sure that the anti-rattle chips are properly installed. You will find the wear tabs towards the edge of the brake tabs of your vehicle. Its purpose is to make sure that the braking system is working effectively so that when stepping foot on the brake pedals, the car will come to a halt. You must first have it checked or serviced before using it again.
When trying to reverse and the wear tabs are not positioned properly, you will expect to hear noises. The wear tabs need to be inspected and repaired correctly.
Screeching noises are produced when metal rubs against metal. Contrastingly, normal gears have a helical form where the teeth are angled in a spiral formation. The latter is made that way for smoother operation.
The noise, on the other hand, is made by the abundance of surface area that makes contact with each other. With the straight-cut gears, there's a massive surface area, almost everything touches, making the sound. Straight-cut gears, though cheap and simple to make, isn't usable in other gears because of the noise it makes — unless you're a race car.
Since straight-cut gears doesn't create an axial load, race cars use this gear type for a more lightweight and simpler construction. Forward gears are helical gears, which have teeth that are pointed at an angle. When the gears rotate, most of the load is evenly spread due to the angles. Reverse gears are cut into spurs, which don't absorb the load quite so well. As a result, there is more of a whining noise.
The reason reverse gears are spurs is because reverse requires an idler gear to prevent accidentally shifting into reverse while moving. This is what is known as the gears not being synchronized, and this is also why you cannot shift into reverse when you're moving.
What you may find interesting is that my Ford F 4x4 makes this same sound when moving forward in low 1st gear. The 4 speed granny low first gear is also using this same technology as it's only designed for towing or going up or down really steep hills. For more information on transmission gears, check out Why does my manual transmission car make a loud whirring noise in reverse? Sign up to join this community. The best answers are voted up and rise to the top.
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