Author Topic: Vibration-causes?  (Read 4894 times)

Offline BSA500

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Re: Vibration-causes?
« Reply #15 on: 08.11. 2012 21:19 »
Well stage one complete-removing the sump plate and what did I find-nothing. No broken up shims or any other sort of metal. Well I tell a lie a large lump of pipe fell out, the oil pick up tube. I know thats alright as the oil return has been excellent I just have to find a better way of securing it.
I will left the top end tomorrow night for further investigation as the vibration was horrible again and seems to be Engine speed related not Road speed.

Offline metalflake11

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Re: Vibration-causes?
« Reply #16 on: 08.11. 2012 23:06 »
Wonder if a conrod bolt has come loose?
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Re: Vibration-causes?
« Reply #17 on: 09.11. 2012 04:35 »
Has the engine ever been balanced or the balance factor checked?

Trev.

Offline BSA500

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Re: Vibration-causes?
« Reply #18 on: 09.11. 2012 08:33 »
I was thinking along the lines of a loose conrod(I was actually expecting to see a conrod nut I was that paranoid) but I will see tonight when the barrels are lifted. As to the balance not this crank I broke my last balanced one-done by Fred Cooper-about 10 years ago and put in the current one. It has its own particular vibration zone but I know where that is and this vibration is truely horible.

Offline BSA500

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Re: Vibration-causes? Update
« Reply #19 on: 09.11. 2012 20:56 »
Well I have taken the top end off( 1hr 15mins a new record) and found nothing,nada,nought. No up down or twist on the conrods,no movement up down or sideways on the crank. The only issues were the inlet valve clearances had closed up a little, a little play in and out on the belt drive pulley(prob cork washer),soldered joints on the oil feed pipes(not that old) loose and leaky rockerbox gaskets. When turning the engine over with the kickstart some rumbley(difficult to explain) noises/feeling from the gearbox- bearings??-very odd. still I can clean up the top end retime the engine with the head off and regasket. Any suggestions people.
Andy

Offline wilko

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Re: Vibration-causes?
« Reply #20 on: 09.11. 2012 21:37 »
Recheck your primary for broken chain rollers.

Online orabanda

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Re: Vibration-causes?
« Reply #21 on: 09.11. 2012 23:07 »
Don't stop now; you need to split the cases.

Offline metalflake11

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Re: Vibration-causes?
« Reply #22 on: 09.11. 2012 23:08 »
If only one nut has come loose there may not be play apparent when you are pulling up and down by hand. One bolt will hold it well enough to fool you Andy. When the nut comes loose the first thing it catches is the bottom of the crank cases and that will cause vibration. (I know!) Sadly, if everything is tight and chains are all well adjusted, you are now looking at a bottom end, and or gearbox dissasembly I think.
As a last straw, you didn't change ANYTHING that rotates about the time this bad vibe started did you?
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Re: Vibration-causes?
« Reply #23 on: 10.11. 2012 00:01 »
Loctite bearing retainer grade will hold the oil pick up tube just fine. Just heat up first if it's ever needed to be removed.

Out of left field but if the tube was not there the oil level would a bit higher in the cases I assume not high enough to cause vibes?
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Offline BSA500

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Re: Vibration-causes?
« Reply #24 on: 10.11. 2012 12:35 »
damm you lot now I have the strip the engine. Still got it out of the frame and noticed something wrong with the dynamo. The bearing on the brush end has broken up and the commutator is wobbling all over the place. Could this be the answer??

Offline muskrat

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Re: Vibration-causes?
« Reply #25 on: 10.11. 2012 19:25 »
 Could be, would have been making a hell of a racket  *eek*. Shame you didn't find that while the motor was still in  *problem*. Good time to refresh the motor now it's out.
Cheers
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Offline BSA500

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Re: Vibration-causes?
« Reply #26 on: 11.11. 2012 09:24 »
Yes it would have been nice but I would not have been convinced it was just the dynamo and still taken the engine down. These bikes make so many noises it is so difficult to pin down any problem. I will finish splitting the cases today. I had the dynamo done by Priory magnetos and contacted Andrew and he is going to fix it foc. He always gives a good service and no quibble and also great advice and as I said it was still giving a great charge *smile*

Offline BSA500

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Re: Vibration-causes?
« Reply #27 on: 11.11. 2012 20:00 »
Finished stripping the bottom end and found no further damage all is good so now clean her up,new gaskets,send off dynamoa nd rebuilsd her.

Offline Hubie

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Re: Vibration-causes?
« Reply #28 on: 11.11. 2012 21:29 »
I'd still replace your bearings while you're there mate, just to be sure.  I just finished a rebuild yesterday on my A10 after a previous rebuild and less than 1000 miles.  Found chewed up shims and a worn and poor fitting drive side bearing which gave an awful noise.  Glad I pulled her down now and she ticks over like a swiss watch.

Good luck, and if you're getting the dyno done, why not go for a 12v field coil and armature?  I run LED's in all but my headlamp and it all works a treat!

Cheers,
Hubie
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Offline BSA500

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Re: Vibration-causes?
« Reply #29 on: 11.11. 2012 22:57 »
Checked over the bearings and shims and all are just fine just like I put them in yesterday. As for the dynamo I am running a standard dyno with DVR2 reg and belt drive. I use the bike every day for work 130 miles per week and in 4 weeks of constant lights on its been brilliant(get it brilliant,lights). The only prob is the failed bearing. I run 55/60 halogen and LED rear.
Will clean down the engine and reset timing etc while apart.
Andy