Author Topic: Dynamo chain  (Read 1815 times)

Offline A10 JWO

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Dynamo chain
« on: 04.05. 2013 17:03 »
Whilst changing my oil pump I noticed that there was no gasket on the outer casing ? The dynamo chain looks good with the correct 1/4" play. I looked in the Haynes bible but it does not mention lubrication for this part of the motor or chain. In fact I cannot see why it needs a gasket on the outer cover ? This is my first A10 so please bare with.

Ta Colin  *conf*

Online muskrat

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Re: Dynamo chain
« Reply #1 on: 04.05. 2013 20:48 »
 G'day Colin. You will need a gasket for the outer timing cover, lots of oil in there. The dynamo section has grease (low melting point) for lube of the chain.
Cheers
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Offline A10 JWO

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Re: Dynamo chain
« Reply #2 on: 05.05. 2013 14:18 »
Hi Muskrat.
I can see the sense in the grease on the chain, but where is the oil feeding from to the rest of this side of the engine. ?

Regards Colin

Offline bikerboy

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Re: Dynamo chain
« Reply #3 on: 05.05. 2013 16:59 »
Colin

The oil goes down to the pump and then thru to the crank via the main bush so the bottom of the timing case always has a fair amount of oil splashing around in there

Offline A10 JWO

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Re: Dynamo chain
« Reply #4 on: 05.05. 2013 17:26 »
Thanks for that, just to get it clear in my head. The new SRM oil pump will  pump will be submerged in oil on the out side of it's body as well doing it's job inside. this will also lubricate the worm drive, am I right ?

Regards Colin























Online bsa-bill

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Re: Dynamo chain
« Reply #5 on: 05.05. 2013 17:45 »
think I see a perspex timing case on the horizon *smiley4*

Always some oil in there right enough, would think from the main bearing bush a little, (ideally none at all)  but not too much  or big ends would starve, always oil dripping down the crankcase sides into bushes and out again so that including constant oil mist is enough to lube the gears and an occasional shot from the little jets in the gallery from the PRV when it opens.
Well they've been running for 70 to 60 years with reasonable results with or with out SRM's pump ,which I'm sure is excellent
All the best - Bill
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Offline A10 JWO

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Re: Dynamo chain
« Reply #6 on: 05.05. 2013 17:55 »
Perspex sounds nice, save on polish.
As per normal I have learnt much this weekend. I did get a new gasket for the outer casing when I bought the pump. Will all go back together Wednesday when the locking tab arrives.
Thanks lads

Colin.

Offline A10 JWO

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Re: Dynamo chain
« Reply #7 on: 08.05. 2013 15:27 »
All done 1/4 lb of low melting point grease, new SRM pump and posh gasket. Nice allen screws, job done and no wet sumping so far £££££'s

Regards Colin

Offline xib34

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Re: Dynamo chain
« Reply #8 on: 27.01. 2014 19:32 »
It is true the Haynes manual omits the need for grease in the dynamo chain compartment. There are other errors and omissions in it also. Good to get a BSA manual reprint.

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Re: Dynamo chain
« Reply #9 on: 28.01. 2014 06:10 »
Yep. Don't believe everything (or anything) you read. If in doubt ask the forum.
Cheers
'51 A7 plunger, '57 A7SS now A10CR,  '83 CB1100F, 88 FXST .
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Offline vwphillips

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Re: Dynamo chain
« Reply #10 on: 29.01. 2014 14:57 »
after timing the magneto, l i did start it for about 5 - 10 sec and did not splash any oil to note

I am going to adjust and grease the dynamo chain before replacing the outer cover.

Do I understand  from A10JWO that I should pack the dynamo compartment with grease?

Offline Topdad

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Re: Dynamo chain
« Reply #11 on: 29.01. 2014 15:53 »
Thats it HMP I think, a lovely mucky job ,one of the reasons I went to a belt conversion, regards BobH.
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Offline stu.andrews

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Re: Dynamo chain
« Reply #12 on: 29.01. 2014 17:43 »
Hello vwphilips.

You may already know this, but a little word of warning if you don't. When you adjust the dynamo chain, done by rotating the dynamo, beware that upon tightening the dynamo securing strap, the chain will get a little tighter. So, don't overdo it! A too tight chain will whine or howl.
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Re: Dynamo chain
« Reply #13 on: 29.01. 2014 18:28 »
The compartment only needs enough grease to cover the chain at the bottom of it's run. Low melt grease will liquify after a few minutes running, the chain will run through the pool (sort of like the primary).
Cheers
'51 A7 plunger, '57 A7SS now A10CR,  '83 CB1100F, 88 FXST .
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Offline a10gf

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Re: Dynamo chain
« Reply #14 on: 29.01. 2014 19:03 »
Quote
A too tight chain will whine or howl.
and wear quickly + destroy bearings etc

A10 GF '53 My A10 website
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