Author Topic: Dynamo drive slipping  (Read 1100 times)

Offline duTch

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Re: Dynamo drive slipping
« Reply #15 on: 26.08. 2018 09:44 »
 
Quote
....I "flashed" with a 12 v battery  ( by mistake, should have been 6v ) and it started turning,  sill on bike....

 yeah ok- and nothing stopped it I presume......hmmmm, so conversely, it's not generating? Maybe you've had a look to see if it spins at all(or not) by pulling the end cover  ?
 Don't forget to catch the ~70 ml of oil in the oil pump cavity when you pull the timing cover (I've cheated and drilled a hole *whistle*)
Started building in about 1977/8 a on average '52 A10 -built from bits 'n pieces never resto intended -maybe 'personalised'
Have a '74 850T Moto Guzzi since '92-best thing I ever bought doesn't need a kickstart 'cos it bump starts sooooooooo(mostly) easy
Australia

Online Peter in Aus

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Re: Dynamo drive slipping
« Reply #16 on: 26.08. 2018 10:44 »
Hi Barry  *welcome* where about's in WA are you? i'm Busselton.
I tried V belts bl**** useless went back to chain, tooth belt cost to much.
Cheers
Peter

Busselton West Australia
49 A7 longstroke
58 A10  SA

Offline wortluck

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Re: Dynamo drive slipping
« Reply #17 on: 26.08. 2018 11:57 »
Welcome Barry.  With the screws, don't you just try 'em to see if they go all the way in *smile*  I find the three in the top right corner are short, then there are two on the left hand side (bit longer) then the rest are the same length. *dunno*  Just wondering now if I put the wrong length screws in the wrong holes, I'll lock the crank up or something equally crazy (maybe that'll explain the grinding and poor performance) *whistle*.  As for the slipping, wot Musky says - no key just on a taper.  Did my (broken) chain recently - was a doddle following advice on here.  Someone suggested a small wooden wedge at the back of the large sprocket.  I did this then tapped round the sprocket gently and off it popped.  *thanks*
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Offline Colsbeeza

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Re: Dynamo drive slipping
« Reply #18 on: 26.08. 2018 13:50 »
Hi Barry,
Welcome. I pinched this from someone on this Forum.
Colin
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Australia

Offline wortluck

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Re: Dynamo drive slipping
« Reply #19 on: 26.08. 2018 14:17 »
Looks like some of my screws are all screwed up then.  Perhaps it's too much beer but what are those measurements again.  Is it 1 inch, 2 inch?  What's 13/4" - sorry if this sounds a bit thick.
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Online Greybeard

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Re: Dynamo drive slipping
« Reply #20 on: 26.08. 2018 14:34 »
What's 13/4" - sorry if this sounds a bit thick.

One and three quarters of an inch, (1.75")

Online berger

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Re: Dynamo drive slipping
« Reply #21 on: 26.08. 2018 14:34 »
I have not been to the pub but i'me going *smile* wortluck I thought that on first glance---- 1/34 is more like it

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Re: Dynamo drive slipping
« Reply #22 on: 26.08. 2018 14:37 »
According to that picture, the various screw lengths are: one inch, one and three-quarters and two inches.

Offline wortluck

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Re: Dynamo drive slipping
« Reply #23 on: 26.08. 2018 14:50 »
Yeah, of course, can see it now.  If it'd been written 1 3/4" would have got it quicker (I think).  Still a bit dodgy for me as I seem to be missing one of the 1 3/4".  I've got 3 x 1", 2 x 1 3/4" and the rest are 2".  Perhaps putting the measurements in decimal form is a good idea?
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Offline barry2

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Re: Dynamo drive slipping
« Reply #24 on: 29.08. 2018 01:18 »
Hi mates
I'm in Dianella, Perth WA,  thanks for the tip about the screws, I can't see a prob' about using the old  chain drive, will let you know what I find
Barry

mod edit: Please do not put personal email/phone #'s in topics. Scammers out there.             
WA

Offline TT John

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Re: Dynamo drive slipping
« Reply #25 on: 05.09. 2018 09:29 »
The belt conversions are usually toothed belt type so it shouldn't slip. However there are some V-belt types around which I would recommend swapping for a toothed type. SRM sell a toothed type but still recommend putting grease in the cavity.

I use a belt conversion kit from Dynamo Regulators Ltd on my A7 also on my two A10s, I believe they are the dogs doodahs, I have never had any problems since fitting them and I think the kit costs about £80 in total, well worth it. Mike Hutchings is the man on wwwdynamoregulators.com or call on 01489 880552
This conversion does not use oil, it's dry but is a toothed 15mm belt drive.

Regards TTJohn

Offline barry2

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Re: Dynamo drive slipping
« Reply #26 on: 13.09. 2018 00:45 »
Hi mates
Managed to tighten the slipping belt OK w/o stripping , but the Dynamo only worked intermitently, so I took it it off  and had a look at it,, everything was near new apart from the casing ,, the armature  segments had solid carbon buildup all around them,  then   I could see it wasn't undercut , so I think that was the trouble, have undercut it and now it works fine ( think the undercut stops the build up of carbon that can short it out) , Another thing the Vee belt drive pulley (engine end) had about 2 mm end float , would that be a problem? thanks for your advice in advance
Regards Barry
WA

Online Peter in Aus

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Re: Dynamo drive slipping
« Reply #27 on: 13.09. 2018 01:09 »
Another thing the Vee belt drive pulley (engine end) had about 2 mm end float , would that be a problem? thanks for your advice in advance
Regards Barry
That sounds like the seal 67-0708 is missing or disintegrated, was there much oil in the housing where the belt run? that seal usually takes up any slack.
Peter

Busselton West Australia
49 A7 longstroke
58 A10  SA

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Re: Dynamo drive slipping
« Reply #28 on: 13.09. 2018 01:11 »
I have not been to the pub , there should be a cork washer that usually takes up the float

Offline barry2

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Re: Dynamo drive slipping
« Reply #29 on: 13.09. 2018 02:11 »
Hi Peter
Thanks for the reply, No oil or debris in the belt compartment, maybe wasn't fitted ,, could I see if it was fitted? or is it on the other side of the housing

Barry
WA