manual transmission problems?

Question

had brand new clutch put in but now when i take off from a dead stop the car shakes and stick shift rattles.

Answer 1

Who ever put the clutch in should have checked the flywheel and the pressure plate for straightness and run-out, at the very least scuffed the surface with some sandpaper.
Just like disks on brakes if either is warped you can have them machined but consider that 9 times out of 10 they will become warped in no time I would replace them.

Answer 2

Hopefully you had the clutch replaced by an experienced auto repair facility. There is more to the operation of a clutch than just friction material, or the disk in this case. The clutch is semi-complicated and is composed of 4 major components. These would be the disk, which is lined with a thick coating of friction material that is meant to wear out over time. A pressure plate that actually clamp forces the disk between itself and the flywheel to turn the transmition gears and make the car move, The flywheel, which is attached to the engines crank shaft an is turning as fast as the engine RPM's, and finally the throw-out bearing that releves friction on the clutch form when the clutch is engaged through the pedal. During clutch maintenance all four of these require attention. This attention includes at least inspection and replacement if worn beyond usefull life. The disk is a no-brainer as it must be replaced after an average of 50 to 60,000 miles of driving, depending on how it was used. The most robust component is the flywheel. This is a large round disk that is bolted directly to your engines crank shaft. It is a very thick and heavy piece of iron that must have a clean true surface finish with very little dimensional runout. Since the clutch runs hot, this component may have signs of heat cracks and also slight warpage caused by the heat. In this case it needs to be ground back into specification, but not necessarily repaced. If it is not perfectly flat, the disk will contact it at the high points first, as the clutch pedal is released, and you will feel vibration or chatter. Left alone, the new disk with quickly confrom the the un-flat condition and loose a siginificant amount of its life. The Pressure plate has a machined surfact to match the diameter of the disk. This plate can suffer heat warpage as well, thus causing additional chatter. The pressure plat has either a spring diapram or individual spring sets that apply pressure to the disk during engagement. This is also an important function as proper tension keeps the disk from slipping under engine acceloration. Slipping causes heat, and wears the disk, heat cause warpage which are all bad things. Normal driving heat will cause the diaphram or springs to loose tension, so it is always advisable to change the pressure plate with each clutch disk change. If your pressure plate was not changed, it may be some of the cause of your problem. The throw-out bearing will either be good or bad. If it spins freely and makes no noise, it is probable good. If you are hearing a growling sound when you gently tap the clutch pedal with the engine running, you should consider changing this bearking. Once is freezes your clutch will stay ingaged.

My guess is that your problem is caused by the flywheel, assuming the pressure plate was changed. This is easy to correct by removing the transmission and clutch. Unbolt the flyweel from the engine and take it to an automotive machine shop for resurfacing.

To maintain a healthy clutch and get the most operating milage out of it, one should never ride the clutch pedal by leaving the weight of your foot on it. This lessens the tension of the pressure plate springs and allows the disk to slip causing heat and premature wear. It also stresses the throw-out bearing. Once moving you should have NO contact with the clutch pedal.

Hope that this helps you understand a bit about how the clutch works and addresses your understanding of why the flywheel may be the cause of your chatter issue. Good Luck...

Answer 3

That sounds like a power transfer problem.

Some things that could be wrong are: The pressure plate (applies pressure to the clutch so it does not slip continuously when it is in gear) and/or flywheel (a large disc at the back of the engine with cogs on it which allow the starter motor to engage and turn the engine) need to be ground flat when the clutch was replaced. (The clutch fits between these two things.) If so, then the surfaces would not marry well and will cause the clutch to 'grab'. Did they need to be and/or were they?

Another is that the clutch is faulty. The clutch has small springs that run in the same direction as the clutch turns and they absorb torsion so the clutch does not 'shudder' as you describe. It will need replacing under work warranty.

Further, the spigot bush -- a brass ring type of thing that fits inside the hole in the middle of the flywheel and also allows the gear box's main shaft to fit into it so the gearbox is snugly connected to the engine -- may be missing (most likely) or damaged.

In any case, if you had the clutch fitted by a mechanic you should take it back to them with the problem and ask them to correct it. You may have to pay for the machining of the flywheel or pressure plate, if that's what it is, or the replacement of the spigot bush if that's the problem but not for any labour involved in fixing it.

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Answer 4

PLEASE tell us what kind of car. If you want useful advice, we need this information. It could be a chattering clutch but I'll bet it isn't. If this was happening before and was the reason you got a new clutch, it's something else. I've had new clutches in without doing anything except wiping off the flywheel and pressure plate with solvent, and had no problems. A more common cause of this sort of problem is that the rubber engine and transmission mounts are worn out and let the engine and transmission assemblies bounce around too much when you take off. You can put these in yourself, it isn't that hard. You might need a little ingenuity, a couple of 2X4s, a scissor jack and a chain. Buy a repair book for your car and check this out.

Answer 5

Was the flywheel resurfaced? A chattering clutch right after replacement is caused by either failure to resurface the flywheel or else the pressure plate , which should have been replaced also, has a problem in the spring causing it to apply unevenly. It will need to be redone to eliminate the problem. It will not go away on its own.

Answer 6

give it more gas as you go into the gear.

you need to get used to the timing of the new clutch.

it'll be fine. more gas!

have a nice day!

Answer 7

>TAKE IT BACK<

they must test drive and fix as needed.

Best wishes1

"/JOe