The flywheel is found primarily in vehicles that have a manual transmission, whereas the flexplate is found in automatic transmission vehicles. Both of these components are typically heavy, but the flexplate is much thinner and therefore lighter than the flywheel.
Do I need a flexplate or flywheel?
While there are some exceptions, if your vehicle has a manual transmission, you want a flywheel, and if your vehicle has an automatic transmission, you want a flexplate.
Why is a flywheel called a flexplate?
The lighter, thinner metal frame has an ability to flex across its main axis – bending side to side (hence the name Flexplate) – taking up motion in the torque converter as the rotational speeds change.
How are the flexplate and flywheel similar?
Flexplates are generally much thinner and lighter than flywheels due to the smooth coupling action of the torque converter and the elimination of the clutch surface. Like flywheels, flexplates normally handle coupling to the starter motor, via teeth cut along the outer edge of the plate.
What are the signs of a bad flexplate?
Symptoms of a bad flex plate
- Clunking, grinding, chirping, or rattling noises from rear of engine when engine is idling.
- Knocking noise when engine is shifted into drive or reverse.
- Heavy vibrations felt through the driver's seat when driving at normal speeds.
- Rough-running engine.
- Loss of power at higher speeds.
What sound does a cracked flexplate make?
Noise. The classic and most obvious symptom of a cracked flexplate involves the sound it makes while the engine is running. Descriptions of the sound include clanking, chirping and a light knocking. The reason for the sound involves the flexplate's location and its function.
Do all engines have flywheels?
Every car has a flywheel. Flywheels are heavy metal disks, between 12 and 15 inches in diameter, with gear teeth cut into its circumference. They are attached to the rear of the crankshaft, between the engine and the transmission.
Why does my flexplate keep breaking?
The following causes for cracked flexplate failures: 1) Out of balance engine or torque converter. 2) Bad starter drive can cause teeth or ring gear to wear rapidly or break off. Teeth can also break when engine is running and starter is engaged.
What causes a flexplate to crack?
Aside from a manufacturing defect, the only things that will cause a cracked flex plate are improper torque on the plate bolts at the crank and torque converter and the most common cause of transmission to engine misalignment; sometimes caused by missing alignment dowel pins that mate the transmission to the engine.
What is the plate between the engine and transmission called?
The block plate, also known as a separator or spacer plate, is a steel plate that goes between the engine and the bellhousing and is there to ensure perfect alignment between the starter Bendix drive and the flywheel ring gear and the transmission input shaft, the bellhousing and the crank.
Is a flywheel and pressure plate the same thing?
The clutch pressure plate is a spring-loaded metal plate that spins with the flywheel and applies pressure to clamp the clutch disc firmly between itself and the flywheel. When the clutch is engaged, springs in the pressure plate force the clutch disc against the flywheel.
Is the flywheel connected to the transmission?
It allows for an electric starter. The starter motor engages the starter ring on the edge of the flywheel to begin engine rotation. Most importantly for drivers, the flywheel connects the engine with the transmission via a clutch to transfer power to the wheels.
What does a damaged flywheel sound like?
You may start to experience grinding noises from the pressure plate and eventually, the flywheel other parts in the clutch assembly will overheat and cause them to warp or even crack. Finally, if the clutch and flywheel are not replaced, you simply won't be able to shift at all.
Does the torque converter connect to the flywheel?
The torque converter casing connects to the flywheel, spinning at the same rate as the crankshaft, within the housing of the turbine. The impeller or centrifugal pump effectively flings the transmission fluid into the fins of the turbine that in turn spins or transmits the torque into the transmission.
Does my truck have a flywheel?
In simple terms, if your truck has a manual transmission, chances are that you have a flywheel. If you have an automatic on the other hand, it will be equipped with a flexplate.
Will a cracked flexplate cause vibration?
A failed U-joint is a heavy vibration device, but one that is not as heavy at all. Most damaged flexplate joints can be Vibrationous at all speeds, even if the flexplate is balanced as well.
What happens when a flexplate fails?
The flex-plate can become cracked over time. As a result, this can cause it, to wobble. So, you might notice rhythmic clunking or grinding noises, while the engine is running. A misaligned flexplate, can also keep the engine, from running smoothly.
How long does a flexplate last?
Slight misalignment may only cause a single flexplate to break in the life of the vehicle. More severe misalignment can break a flexplate in 15,000 to 30,000 miles.
Is a flex plate a flywheel?
Basically a flywheel or flex plate is the round metal disc shaped component that transfers power from the engine to the transmission. A flywheel is usually referenced to a car with a standard transmission,and a “flex plate” is used with automatic transmissions.
Can you start an engine without a flywheel?
Starting it without a flywheel is not a good practice, and not an easy feat... unless you are good at pull starting a V-8... Also the result in an engine that requires the flywheel for balance could be very harmful. The torque converter does not have to be on the engine though.
How much does it cost to replace a flexplate?
Based on all these factors, you can get your flexplate under $100 or for a couple of hundred dollars. Combine all of the factors mentioned above, and you safely total a cost of around $1200-$1500 to replace your flexplate.
Can a cracked flywheel sound like a rod knock?
Yes a cracked or loose flexplate can sound like a rod knock.
Does flywheel spin in neutral?
The flywheel does not spin when in neutral. This is because the input shaft that connects to the clutch plate; then to the pressure plate which connects to the flywheel is designed to spin freely when the vehicle is in neutral.
What does a flywheel look like?
Although a flywheel can take other forms — such as a cylinder or an outside ring with spokes like a wagon wheel — in automotive uses, it's usually a solid, metal disc that's about an inch thick, a foot in diameter and around 10 to 40 pounds (depending largely on material, from lightweight aluminum to heavy cast iron).
