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MG TD TF 1500 - flywheel

I was told by my machine shop that there are cracks around the bolt holes in my flywheel and he thinks I will have to replace it. Is it not possible to repair these thread holes in any way? I did not see on the moss motors site where you can purchase a new one. I am pretty concerned as I have been waiting on the machine shop to start my work for about 8 weeks and now this problem has arisen. HELP.

Rob
Rob Welborne

If they are definitely cracks I would not use it. Used ones are around without much problem; don't buy a new one. Surely someone on this list has a used one (what size - 7-1/4" clutch or 8"?). Expect to replace the ring gear - and I would lighten and balance it, as well, although opinions differ. More accelleration and little change otherwise.

Tom
t lange

abingdon has some,,,, I would call for details,,,,
http://www.abingdonsparesllc.com/catpg13detail.html

SPW
STEVE WINCZE

Check with O'Connor, and Dan Craig, etc.

Tom
t lange

Rob, I have both the early and later flywheels for sale. Please send me an email if you are still looking.
Cheers, Hugh Pite
H.D. Pite

Rob, intruiging issue. How big and extended are these cracks? Around all four holes? Are they soo large that it is not likely any more that the bolts can holt the hole flywheel? Are the cracks visible on both sides of the wheel? Visible with bare eye?
To me it looks like a flywheel does not get such tremendous mechanical loads in normal operation. The starter cranks but does so at a large diameter so not too high forces. The clutch puts on its torques but that also is not soo dramatic. The construction is such that the gear ring adds a nice compression on the flywheel. So, from normal operational conditions, I cannot see how the material can suffer so much that it cracks. Couldn't it be cracks from the originating manufacturing proces that always have been there?
If the flywheel has been involved in a dramatic accident (broken crankshaft kind of things) than things look different. Greetings, Huib
Huib Bruijstens

rob, trust me, you do NOT want to see the results of a flywheel that has left the crankshaft. in the STRONGEST terms i suggest you find a sound flywheel. good catch by your machine shop. you owe them one. i agree with the rest here, there is a ready supply of sound used ones to be had. regards, tom
tom peterson

I agree with Tom Peterson - a loose flywheel is not a pretty sight, nor is the engine when the flywheel parts ways. At the very least the crank flange is all chewed up, the threads buggered, and the pins sheared; at worst the block or your feet are fractured. The flywheel is spinning fast and generates quite a bit of momentum...

I once bought a Porsche 356 with a loose flywheel - the guy assured me he had shut it down as soon as he felt the vibration. Most expensive engine I've ever had to rebuild, as the flywheel had been rattling for a looooooong time...

Tom
t lange

Tom and tom, I absolutely agree that a loose and leaving flywheel are dramatic. But what is the relationship between some so far undefined cracks and this condition? Greetings, Huib
Huib Bruijstens

IF there are cracks (I have also seen galling marks there from bolt heads), then the thinnest area of the flywheel must be considered suspect, and NOT be used. If a piece broke off, the one bolt by it would certainly come loose, and that would compromise both the balance and the strength of the entire flywheel.

Magnafluxuing would be best to check for cracks.

Tom
t lange

Rob - photos of the cracks would be very interesting to see.

Tom
t lange

This thread was discussed between 06/07/2011 and 07/07/2011

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