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MG MGA - mga 1500 CRANKSHAFT

A good friend of mine has just installed a new crankshaft from VB. Nothing else has been replaced. Clutch alignment tool works fine-transmission inserts fine yet with 3/16 inch to go it tightens up and locks the crank from turning without the transmission being up flush,
Question?
Has anybody had this problem?
I suspect the the hole in the crankshaft for the pilot bushing is not deep enough.
Engine is coming back out in the morning .
Sandy
ss sanders

New or reground old crank?
Art Pearse

Art.
It is a new crank from Victoria British.
What part of Ontario do you live in.
Please contact me.
esane at m-sn dot com.
Sandy
ss sanders

Wow. If you're right about the pilot hole, that's a nasty problem requiring disassembly of the engine again. Bummer. Can someone measure a known good crankshaft to get the proper dimensions? If this is bad I would like to post it on my web site as a Faulty Replacement Part, and continue to follow up on it.
Barney Gaylord


Barney.
I just had a talk with the crankshaft owner. He measured the depth of the pilot hole new versus original and it is 3/3" more shallow.
Apparently Moss is aware of a problem. and on the strentgh of that he called VB. Asked about the problem prior to purchase and the counter guy said that there were no known problems.
He contacted VB this morning and the answer was "send it back"
While writing this I received a return call from Moss. The problem with theirs is that the flywheel bolt holes were not in the correct place and you have to index and create new holes.
Glad your back on the road.
Sandy
ss sanders

CORRECTION.
The pilot hole is 3/16" shallower than the original crank.
Email me off web and I will forward the info from Moss.
Sandy
esane-at-msn dot com
ss sanders

Sandy,

Rather than dismantling the engine can you remove the clutch,remove the bronze bush, drill the hole a bit deeper (use drill diameter slightly bigger than gearbox spigot but not as big as the bush OD) and then fit a new bronze bush?

Bob Schapel
R L Schapel

Bob.
That is a good idea. I will pass it on to the owner.
Sandy
ss sanders

You had better jig the drill nice and square, no hand held.
Art Pearse

I don't think you have a cat in hells chance of drilling the shaft as it will be far too hard
Iain MacKintosh

Sandy,
He could use the old bronze bush as a sacrificial guide. drill it out slightly in the process but when replaced with a new bush all would be good. This assumes it is the hole in the crank that is not deep enough for the end of the gearbox spigot. If the bore for the bush is too shallow for it to go all the way home, a shorter or stepped bush might be required. The metal might be too hard but I doubt it unless it is nitrided.

Bob Schapel
R L Schapel

I agree with Bob...should be able to drill the inside of the crank.
Gene Gillam

Just buzz a drill the size of the input shaft plus a couple of thou through it and reassemble.

Or if the bush isn't pushed all the way into the crank hole (they often are not as the machine shop stops once they are flush) try pushing it further in.

No idea if current bush stock is shorter than the crank hole, mind you.

The usual source of this problem is when someone fits an MGB diaphragm clutch without realizing you need to relieve the inside of the bellhousing, but as you reused the same clutch that isn't the case here.
Bill Spohn

This thread was discussed between 29/08/2014 and 31/08/2014

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