My dad has a 92 automatic golf.....there is a noise when driving and a cracked flex plate is suspected......if this is so should it be fixed immediately or can he drive it until the sound gets louder....also what are the risks of not fixing it immediately as this is quite a costly problem because the gear box has to be opened and the flex plate is also very pricy.....
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Three most likely causes are: #1 You forgot to tighten up all the torque converter to flex plate nuts/bolts. #2 You cracked the flex plate during the transmission change. #3 You forgot to swap one or both of the alignment dowels from the old transmission to the new one during the change. These are hollow dowel pins. They go between the bell housing of the transmission and the engine block. Failure to have both dowels in place will lead to the flex plate cracking [see #2]
many different things could have caused it,
incorrect torque on the flywheel bolts...
bad thrust bearing in transmission...
up to "you got the one lucky flexplate" that had stress fractures during manufacturing.
Flywheels very seldom give a problem and have nothing to do with acceleration problems . If it was loose you would have massive vibrations and would know of a problem . If it is an automatic the so called flywheel ( flex plate) have a tendency to crack at the crank mounting bolts and the cracks radiate out to where the torque converter mounts on and then there will be no drive or start action as the ring gear just falls away from the starter. The noise may be from the plate starting to fail so remove the inspection cover and check the plate for cracks or rust streaks which are cracks that you will not see.
If the car is an automatic, it will have a thin metal flex plate, rather than a regular flywheel. If the flexplate gets a crack in it, it would cause a bit of noise. See if there is an inspection plate on bottom front of transaxle. Remove the inspection cover to look at the flex plate. Turn the engine over to view the flexplate all around. Look for cracks, maybe a loose or missing mounting nut where torque converter mounts on flex plate. If you see nothing, leave the inspection cover off, and run the engine and listen closely for a problem from that area. Leaking oil, eh? Don't know if related, but while looking at the flexplate, check if motor oil is leaking out the rear main crankshaft seal. It will be fitted to the rear engine block, in front of the flex plate. Oil would be dripping off the rear of engine, or maybe collecting at bottom of bell housing, evident when inspection cover is removed.
The flex plate may be cracked and this is causing it to hit the starter drive or other point inside the bell housing. Remove the transmission and replace the flex plate is the likely fix. Have a shop confrinm this guess of mine.
Yes, but if your car has an automatic it's called a flex plate, and yes they do crack/ or the bolts have elongated there holes from not being tight enough and can sound like a knock, a standard transmission has a fly wheel that the clutch contacts to operate, I have seen them heat crack on the surface and can be resurfaced.
Noises are very hard to diagnose without actually hearing it. If it sounds like it is coming from around the tranny you may have a cracked flex plate. The flex plate is bolted onto the end of the crankshaft and is between the engine and transmission. It connects the crankshaft to the torque converter of the transmission. It also has a gear around it that the starter uses to turn the engine over. Have you noticed the starter sounding different when you start your car. A cracked flex plate will cause that or you may have a faulty starter causing your sound. Flex plates get cracks around the bolts that hold it to the crankshaft and can make a clicking noise. You may be able to remove the cover off of the bottom of the bell housing of the transmission and inspect it. Look for cracks or rust trails which is evidence of a crack. Not sure if you will be able to see far enough up in there or not. Rotate the engine around a little so you can get a look all of the way around it. It could be an engine or valve train noise also. Noises can ressonate through other components and make it hard to pinpoint. You may need to get some kind of stethoscope to help locate it.
A lot of work goes into the replacement of a flex plate. Often time, replacing the back end of the engine becomes necessary. What he is saying is he may be able to get an engine and put it in for cheaper than all the labor involved with what needs done with your engine. The thing is a new engine would be FAR more expensive than a used engine. Anytime you buy a used engine you have to strip it down anyway and put a bunch of new parts anyway to make sure it does not go bad after you install it. Needless to say this is a lot of labor hours as well. It is going to cost some money either way but a new engine will not be cheaper and a used engine will need some labor hours put into it as well. It is my opinion that a new motor would not be cheaper. I would seek a second and a third opinion and when you get them opinions don't tell them what the others told you other than what is wrong and how much to fix and see what they say. Here is a brief description of the flex plate.
A vital part of an automobile engine equipped with automatic transmission, a flexplate consists of a piece of thick sheet metal that bolts to the crankshaft and torque converter. Similar in function to a flywheel in manual transmission engines and called a flexplate due to its expansion, or flexing, during the operation of the engine, flexplate usage presents opportunities for cracks to develop.
Noise - The classic and most obvious symptom of a cracked flex plate 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 flex plate's location and its function. Those factors ensure that when the engine starts and the driver puts it in drive, the cracked flex plate's movement will create a noise.
sounds like it is incorrect flex plate
for bolts to keep coming loose i wouldsay the bolt threads in end of crank have been streched thru over tightening
you may be able to redrill and tap these
to do this you will have to pull engine
you alsocannot weld craCKS IN A FLEX PLATE
FLEX PLATES flex THEREFORE WELDING IS A WASTE OF TIME
WELDING WILL ALSO PUT FLEX PLATE OUT OF BALANCE WHICH AGIAN WILL CAUSE CRACKS AND PROBABLY WAS THE ORIGINAL PROBLEM TO START WITH