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MG Midget and Sprite Technical - Help 1500 flywheel measurement required!

Hi all,


Hopefully someone can help me out here, I need to know the depth of the rim of metal which holds the clutch cover away from the flywheel on a 1500 midget.

I recently took a flywheel to be lightened and balanced, the company who did this managed to lighten this rim away, which meant after a 4 hour engine in and out I couldn't disengage the clutch from the flywheel! To rectify this I am having some spacers machined to recreate the required gap but I don't know the exact depth. It' looked about 5mm, if anyone has a flywheel for a 1500 accessible I would greatly appreciate this measurement!

Thanks in advance

Dave
D Prince

Dave,
I don't have a flywheel to measure so I cannot help with the dimensions, but why on earth were they lightening the thing by removal of metal in the centre!? The whole point of lightening a flywheel is to reduce the inertia and to do that it means lightening by removing mass predominantly near the outer rim. This is done by scooping out at the rear of the flywheel but leaving enough in the outer rim to support the ring gear. The centre should remain untouched as it has very little effect on the rotational inertia, but does need to transmit the engine power between crank and clutch plate!

Guy
Guy Weller

Guy,

Their excuse for this error was that they were "cleaning up the face!?!?" They did remove an area of mass in the location you mentioned, to touch the other face in my eyes was completly unnecessary!

Dave
D Prince

Hi Dave

I have a 1500 engine with flywheel and clutch attached sitting on the floor of my garage, if you can give me a little more help as to the info you require I will be more than glad to help.

Cheers Carl
C Bintcliffe

Carl,

You would be a legend if you could help me! The measurement that I am after is the depth of the ring of metal which sits clutch side of the flywheel, and spaces between the clutch cover and flywheel. The ring should be about 7.5" in diameter and the depth measurement i'm after will be somewhere between 2 & 5 mm by recolection from seeing the original.

I have tried to find a pic on the net of an original to point out what I mean, but all to no avail! If you need further clarification let me know.

Dave :)
D Prince

Hi Dave,

As my engine is out at the moment too - next Saturday I hope Bas Timmermans will assist me (or will I assist him?:)) in putting it back with a FL 5-speed attached- I also took the measurement for you. In my case the thickness is rather more: 0.9 mm to be precise. It's a 1977 1500, original engine by number (but that doesn't say all, does it?)
I assume you meant the thickness of the flywheel as it thickens there where the clutchcover is attached on the flywheel.
Hope it's of some help.

Rolf
Rolf 1977 1500

And to make it more clear, I mean the thicknes of the rim, not the whole flywheel.
See the picture (sorry for the blurryness)


Rolf 1977 1500

Dave,
I think I mis-understood your first message. I thought you were saying that they had machined the centre of the flywheel where it bolts to the end of the crank.
Sorry!

Guy
Guy Weller

No probs Guy,

Rolf I hope you meant 0.9cm or 9.0mm as i'm sure it's thicker than 0.9mm. That is definitely the right area to measure though, thanks :)

P.s Nice pic!
D Prince

Bu..er! Sorry!

9.0 mm or 0.9 cm it is.
Rolf 1977 1500

Dave
Sorry about the delay but I have now measured the flywheel and I can confirm that the part you want is 9.2mm thick.

Cheers Carl


C Bintcliffe

This thread was discussed between 22/07/2008 and 23/07/2008

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