Author Topic: A10 break down, analysis  (Read 1732 times)

Online Greybeard

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Re: A10 break down, analysis
« Reply #30 on: 28.05. 2017 22:25 »

A few years ago Dutch and me bought new high-flow pumps from John Phelan: contact details in this article.http://www.sumpmagazine.com/bsamotorcycles/bantam-john.htm


They cost about half the price of the pretty SRM pump. They are steel, rather than anodised alluminium. You could ask him if they are still available.

Offline BSAnders52

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Re: A10 break down, analysis
« Reply #31 on: 28.05. 2017 23:32 »
Thanks for the tip. I will certainly check with him once I have the "to-buy-list" more complete.

Anders
sweden

Offline BSAnders52

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Re: A10 break down, analysis
« Reply #32 on: 29.05. 2017 17:37 »
OK; here is the epicentrum - a somehow broken circlip.. The inner circlip, and the small piece has migrated through the hollow piston pin. Well on the RH side, it started to excavate the piston and the area it could reach when passing up and down in the cylinder, making an impressive gash..
The pin got locked a bit askew, inwards to the center of the engine, with the bigger part of the circlip, and gnawed away on its side of the cylinder..
The RH circlip is still in its groove, untouched so far.. but with very little material left to hold it.

Not a pretty sight, but very clear.

The path is clear..

Anders
Sweden

Online Greybeard

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Re: A10 break down, analysis
« Reply #33 on: 29.05. 2017 17:46 »
YUK!

Online chaterlea25

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Re: A10 break down, analysis
« Reply #34 on: 29.05. 2017 20:25 »
Hi Anders,
There are reasons why engines spit out circlips *????*
With wire circlips the ends of the pin should be chamfered,
If the pin moves outwards it should push the circlip tighter into its groove
Wire circlips must only be used when the pistons have a semicircular groove to match
Do not use wire circlips with "ears"

If the small end bushes are not "square" to the bore and parallel to the crankpins it will lead to failed circlips
All sorts of reasons this can happen from a misaligned small end bush to a bent conrod

John
1961 Super Rocket
1963 RGS (ongoing)

Online RichardL

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Re: A10 break down, analysis
« Reply #35 on: 29.05. 2017 21:48 »
Yeah, what John said. You know how I know this? Because John said it.

I'm just slightly amused by protecting against things falling in the crankcase. I think you'll be in there soon.

Richard L.
Plan on signing up for the world-wide 2020 DISTINGUISHED GENTLEMAN'S RIDEon September 27, 2020 (if it's not cancelled and we are free to move about by then). Watch website at https://www.gentlemansride.com for details.

Offline BSAnders52

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Re: A10 break down, analysis
« Reply #36 on: 30.05. 2017 01:59 »
Nothing fell down into the crankcase, I am sure. Both halves of the circlip were retrieved, and  I had put a rag around and under before I lifed the cylinder for real..Pistons were in top position, just to have some distance to lift before someting fell down, IF there was anything that wanted to escape..

Yeah, Everything is not yet reveiled.. But it will soon show.

I am off to Holland this morning.
When I loaded the bike on the trailer, alone, it fell halfways up.. back wheel still on the ramp.
The ceiling is very low, so eventually I lifted off the canopy (? tarp tent), just to get leverage, it is hard when you are bent doubble , lots of ratchet straps is good to have
I struggeled for more than two hours, but I got it there. Could not wake up my neighbours in the middle of the night..
Nothing bent or dented, it is an off road machine.
Oh well..

Anders
Sweden

Online RichardL

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Re: A10 break down, analysis
« Reply #37 on: 30.05. 2017 02:26 »
Well, what I tried to get across with tongue in cheek is that there seemed to be no need to protect the crankcase since it must come apart, probably next. Sorry for obscure (but not last) attempt at humor.

Richard L.
Plan on signing up for the world-wide 2020 DISTINGUISHED GENTLEMAN'S RIDEon September 27, 2020 (if it's not cancelled and we are free to move about by then). Watch website at https://www.gentlemansride.com for details.

Offline bikerboy

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Re: A10 break down, analysis
« Reply #38 on: 13.06. 2017 02:02 »
muskrat

I personally would not recommend feked in my experience they often supply the wrong parts (even by part number) and they are shall we say hesitant to give you your money back even when its their error :(

Online muskrat

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Re: A10 break down, analysis
« Reply #39 on: 13.06. 2017 08:38 »
G'day bikerboy.
I have only got the liners off them. The right ones supplied, look good and measure up.
I had their site bookmarked so was just easy to copy their address.
Cheers
'51 A7 plunger, '57 A7SS now A10CR,  '83 CB1100F, 88 FXST .
Australia
Muskys Plunger A7