Author Topic: Dynamo toothed belt not lasting  (Read 2592 times)

Offline muskrat

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Re: Dynamo toothed belt not lasting
« Reply #15 on: 13.02. 2015 10:31 »
Yep got a reply from Gery at SRM.
Hi Jim,
if its a standard Boyer ignition module and not a micro-power type, it comsumes 28 to 30watts, a micro-power uses 6watts. But as you say the lights are not used , then it should be ok, the pipes will transfer extra unwanted heat, so please pack the dyno belt drive with grease when its re=fitted.
Cheers Gary


 Looks like the high level pipe is getting the blame, and a new coat (heat wrap). I was going to do it one day. I'll try a little LMP grease in there as well. Yes I don't like that idea either Richard, but I'll try anything twice.
My plunger has eaten a couple but at a much slower chew. Doubt if heat is to blame there.
Cheers
'51 A7 plunger, '57 A7SS now A10CR,  '83 CB1100F, 88 FXST .
Australia
Muskys Plunger A7

Offline metalflake11

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Re: Dynamo toothed belt not lasting
« Reply #16 on: 13.02. 2015 15:39 »
I've always ran my S.R.M. belt in grease, no problems so far, and about 7,000 miles. Mag ignition, 35/45 headlight and LED's everywhere else.
 For my money the grease must keep the belt cooler.
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Online bsa-bill

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Re: Dynamo toothed belt not lasting
« Reply #17 on: 13.02. 2015 16:02 »
Quote
For my money the grease must keep the belt cooler.

Yep - think that's got to be so, big old y alloy case exposed to the air and the grease just a liquidish heat transfer from belt to case.
I've seen a lot of big poly vee belts give up on combines and such, tucked away in the engine compartments / safety shields out of any airflow, always some friction on pulleys and the smaller the pulley the more work is put into the belt to bend around it
All the best - Bill
1961 Flash - stock, reliable, steady, fantastic for shopping
1959 Rocket Gold Flash - blinged and tarted up  would have seizure if taken to  Tesco

Offline muskrat

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Re: Dynamo toothed belt not lasting
« Reply #18 on: 16.02. 2015 03:42 »
Your not going to believe this fellas. The cafe off the road with a broken belt.
Saturday arvo I was readying the plunger for a 150 mile ride on Sunday. I thought I'd better check the belt. All good, same tension as set last time, no worrying marks. 50 miles into the ride she spluttered to a halt. Let cool for a minute and she fired up as if nothing was wrong. Another 2 miles she stopped again!!  That confirmed it for me, bat flattery. Bugga, Boyer ignition. Jumped on a mates pillion seat to complete the ride. (New Triumph's seat and top box no good for my back, I'm real sore today.) Recovered the bike with my trailer. 1st test dynamo output, zilch nil nothing. You guessed it, another broken belt.This one a real clean brake/snap, the cafe's belt was mangled. So both off the road till replacements arrive from SRM (3 weeks at least).
Now where did I put the chain and sprockets? Oh that's right, their on last years bike show trophy's.BUGGA.
Cheers
'51 A7 plunger, '57 A7SS now A10CR,  '83 CB1100F, 88 FXST .
Australia
Muskys Plunger A7

Online orabanda

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Re: Dynamo toothed belt not lasting
« Reply #19 on: 16.02. 2015 08:16 »
Musky,
I can send you my spare; should only be a few days from WA.

You can replace in due course.

PM me if this suits,
Richard

Offline muskrat

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Re: Dynamo toothed belt not lasting
« Reply #20 on: 16.02. 2015 09:09 »
Mate, that would be great. PM sent.
We can only get the standard Syncroflex in Australia from a mob in Victoria. Pies Australia is the only one I've found.
Cheers
'51 A7 plunger, '57 A7SS now A10CR,  '83 CB1100F, 88 FXST .
Australia
Muskys Plunger A7

Offline chaterlea25

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Re: Dynamo toothed belt not lasting
« Reply #21 on: 16.02. 2015 16:42 »
Hi Musky
I would run the belt looser than the normal 90deg twist tension
My SR's belt has been fitted for quite a few years now and no troubles so far
I felt the 90 deg twist tension was too tight when I fitted it so its set "a bit" looser
Are you going to add grease? mine is running dry

Cheers
John
1961 Super Rocket
1963 RGS (ongoing)

Offline muskrat

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Re: Dynamo toothed belt not lasting
« Reply #22 on: 16.02. 2015 18:59 »
G'day John.
There has to be a better way to measure the correct belt tension. The 90 deg method gives about 3/8" play. I will try the grease, but am concerned that with a little more play and grease the belt might jump teeth on the pulley.
The dyno pulley has 16 teeth so not at the 14 minimum. I don't think heat was a factor this time.
Cheers 
'51 A7 plunger, '57 A7SS now A10CR,  '83 CB1100F, 88 FXST .
Australia
Muskys Plunger A7

Offline chaterlea25

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Re: Dynamo toothed belt not lasting
« Reply #23 on: 16.02. 2015 19:37 »
Hi Muskrat,
I would have thought an easy 3/8ths was enough,
I have seen toothed cam belts still working when they were hanging loose *eek*
Its been quite a long time since I had the timing cover off mine *????* so fingers crossed
One advantage of running a mag ignition though is that I should be able to get home with out charging
Cheers
John
1961 Super Rocket
1963 RGS (ongoing)

Offline metalflake11

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Re: Dynamo toothed belt not lasting
« Reply #24 on: 16.02. 2015 23:42 »
Forgot to mention in my earlier post. My pipes are high level, same height as the front pulley and only about 1/8 inch from the casing. It's never caused at problem for me.
Like Travolta said "Grease is the word"
England N.W
1960 A10
England

Offline muskrat

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Re: Dynamo toothed belt not lasting
« Reply #25 on: 17.02. 2015 08:57 »
I questioned Pies about the Gen111 belts. Got a reply that looks good for anyone in Australia.

Hi Musky,

We offer as follows:

4pcs     10AT5/420 GEN III Synchroflex Belts    $25.25 ea +GST

Time of delivery: approx. 1-2 weeks subject to prior sale.

Regards,
Hayden

'51 A7 plunger, '57 A7SS now A10CR,  '83 CB1100F, 88 FXST .
Australia
Muskys Plunger A7

Offline duTch

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Re: Dynamo toothed belt not lasting
« Reply #26 on: 18.02. 2015 23:03 »

 Yesterday I had another look, doesn't 'seem' too bad, but evidence of wire protrusion on the belt rear side. The outer face of each pulley are within a poofteenth of each other...and it seems the belt wants to run against the inner flare/flange of both, even though there is about ~1mm clearance outer side,  so I'm wondering if the swarf I found is from the pulley 'flares'... *????*

  Belt tension is as per 90˚ twist, or ~5mm deflection mid-run, pulley centres 130mm (pic.2)...oh yeah, it is a 10mm belt..you'd think I'd install it so I can read the numbers without a headstand..!!
Not much else I can add for now except say I'll chase up a spare belt, the local bearing shop does belts, will see if they do these...and try that Pies shop...

 Not sure if the swaarf is that in pic4 or just some random stuff from the floor- is more than I remember, but looks like it *eek*
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
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Offline muskrat

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Re: Dynamo toothed belt not lasting
« Reply #27 on: 19.02. 2015 11:40 »
G'day duTch. I've got two coming from SRM. One to replace the belt orabanda loaned me and one for the cafe.
I'll be ordering 4 from Pies if you want one or two.
The deflection should be felt on the bottom run of the belt and would suggest a bit more than 5mm but not enough to hit the screw boss in the middle.
Cheers
'51 A7 plunger, '57 A7SS now A10CR,  '83 CB1100F, 88 FXST .
Australia
Muskys Plunger A7

Offline wilko

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Re: Dynamo toothed belt not lasting
« Reply #28 on: 19.02. 2015 21:51 »
 Why not use a V belt like Velo's?

Offline duTch

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Re: Dynamo toothed belt not lasting
« Reply #29 on: 19.02. 2015 23:54 »
 
Quote
Why not use a V belt like Velo's?
Wilko,
  Reasonable idea, but I guess it could be done but as I/we already have this setup....may as well use it, and the other would require more research/logistics.. *conf*

 Yo Musky, I was gonna ask where's the Pies Shop..?? but think I just found it, probably just as easy for me to go straight there, save any double-up postage and hassle??

  As far as I can tell the belt pitch is 5mm? -or would it be in imperial ?  Trying to crack the #code; A=section/wide?, T=toothed?, 5=mm?, 420=mm length? (84T x5mm =420mm)
 But what about '046'...? batch#...?

 To determine the 5mm deflection, I pushed on the bottom side to get a straight line on to measure from the top, and the belt just touched the boss under pressure. Other than than, how does it matter if the slack is at top or bottom as it spins anti-clock..?

 Just had a look at Pies, but can't find a listing for 10mm belts??? smallest is 16mm (16AT5/420 Synchroflex Timing Belt)

...a bit later....
  Cancel all that kinda- I just called Pieshop, and spoke to Shannon, he said they cut it to width, and they don't have any RED Synchro 111 in Oz, it may need to come from Germany...the RED belt is about 25% stronger..
  ...sooo, I'll email Hayden?

 



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