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Post by super150 on May 19, 2013 7:05:06 GMT
Hi - having put my new crankshaft in, but as yet to put the casings back together, there is play in the crankshaft, ie if I grab the shaft (oooerr) flywheel side I can move the crank about a mil either way. This normal? I just assumed it would be rigid?
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Post by kru251 on May 19, 2013 18:06:26 GMT
I suspect what you are experiencing is a sort of angled movement around that fact that the crankshaft is unsupported the other side! Will probably be fine once both sides of the case are together, but you can always try a "dry run" assembly just to check. I did!!!!
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Post by sbwnik on May 19, 2013 20:18:07 GMT
If it is a mm with the two halves together, you have a problem. If it's a 'click' then that's normal.
If you're really concerned, hold both the clutch and flywheel ends at the same time and try and move it that way. I'll bet there's not much.
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Post by super150 on May 19, 2013 20:34:00 GMT
Ok, thanks guys. 😉
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Post by kru251 on May 19, 2013 20:44:17 GMT
If it is a mm with the two halves together, you have a problem. If it's a 'click' then that's normal. If you're really concerned, hold both the clutch and flywheel ends at the same time and try and move it that way. I'll bet there's not much. I'd agree Nik, but I read this bit. having put my new crankshaft in, but as yet to put the casings back together, there is play in the crankshaft |
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Post by super150 on May 20, 2013 9:52:30 GMT
All good, no movement now the casings are back together. Good evenings work as it happens, clutch built and back on cases back together and stator and flywheel back on.…worries me abit when things go a little too well, know what I mean :0/
Those woodruff keys are bloody good tight fits when you have a new crank arnt they!
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Post by sbwnik on May 20, 2013 20:19:38 GMT
If it is a mm with the two halves together, you have a problem. If it's a 'click' then that's normal. If you're really concerned, hold both the clutch and flywheel ends at the same time and try and move it that way. I'll bet there's not much. I'd agree Nik, but I read this bit. having put my new crankshaft in, but as yet to put the casings back together, there is play in the crankshaft That was the point I was trying to make. |
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vespasian
High Number
greater manchester
Posts: 235
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Post by vespasian on Jul 11, 2013 15:20:35 GMT
erm,,,i have just finished my rebuild with new seals and bearings,crank has done only 2ooo miles,however there is slight play on mine too, however have noticed that even new crank bearings now have slight left to right play in them,the last two i ordered from different dealers had the play anyway,one other thing to mention is that you should check it without the flywheel on,as there is slight play between the woodruff key and keyway
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Post by sbwnik on Jul 11, 2013 18:57:03 GMT
There shouldn't be any play at all between key and keyway!
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Post by kru251 on Jul 11, 2013 19:14:56 GMT
Sounds like your using an old woodruff key that doesn't fit correctly. As Nik say there should be no play/rock. Mine had to be wet 'n' dry'd carefully on the sides to ensure it had the edges flat and then tapped into place gently with a nylon hammer. No issues on mine so must be OK!
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Post by kru251 on Jul 11, 2013 19:23:49 GMT
double post
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vespasian
High Number
greater manchester
Posts: 235
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Post by vespasian on Jul 12, 2013 10:57:10 GMT
Sounds like your using an old woodruff key that doesn't fit correctly. As Nik say there should be no play/rock. Mine had to be wet 'n' dry'd carefully on the sides to ensure it had the edges flat and then tapped into place gently with a nylon hammer. No issues on mine so must be OK! possible,,as this woodruff key is a fair few years old,dont need to bang it on either, |
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Post by sbwnik on Jul 12, 2013 23:20:59 GMT
It should be an interference fit. Should slide on, but not just drop on.
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Post by Rudi on Jul 13, 2013 9:36:35 GMT
there should be a minimal free play in the crank
no play at all can mean the main bearing would experience side pressure
add normal expansion of metal, due to heat, and you got more pressure
if i were to guess, it should be less than a mm
i ASSUME 0.3 mm would be ok
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Post by sbwnik on Jul 13, 2013 23:14:56 GMT
^^^ That
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