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I thought the small end bush would be an easy job!!!
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thornebt
Somerset
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November 12, 2018 - 4:46 pm
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The engine rebuild has gone quite well so far.  This afternoon's job was replacing the worn small end bush.  So I rigged up a bolt and spacer thinking I'd wind the new bush out and the new one in behind it.  It didn't go well!  I managed to distort the new bush.  Anyway my barrel is at the engineers being honed so I phoned them and asked them to do the bush replacement job for me as soon as my new bush arrives from Rex.

I thought this would be an easy job but I'm not going to risk messing up a second bush at £14 each.

Cheers.  Bruce.

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mike p5xbx
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November 12, 2018 - 5:36 pm
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you do realise they have to be reamed to the correct size after fitting

D? - D10- D14 Bantams 350 AJS -500 Triumph http://bsanotru.....lfire.com/

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thornebt
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November 12, 2018 - 6:19 pm
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Hi.  Yes, I realise it will need to be reamed.  I used the same size adjustable reamer to ream the layshaft bushes.  That job went well.  Cheers.  Bruce.

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daveclough
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November 22, 2018 - 8:26 am
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I did the same, in fact on my c15 i got one bush stuck in a case side grrrrrr. Glad others face the same challenges. 

 

Dave

1966 BSA Bantam D7 - Bones CDi and Yamaha Clutch conversion.

A 1969 B175 - with Bones CDi, and new Amal MK1 Concentric

Another 1966 D7 which is presenty beng assembled.

My personal blog can be read at http://www.anot.....yvisor.com

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Blue Heeler
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November 23, 2018 - 12:41 pm
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Stepped mandrel prevents crunching new bush during insertion.

Blue

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GCOBBY
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November 27, 2018 - 12:17 pm
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I have replaced small end bushes, extraction was fairly easy, used junior hacksaw to cut through the old bush in the con rod. This made the extraction easier, still used bolt and washers to remove bush, and to refit new one .

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thornebt
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November 27, 2018 - 12:57 pm
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I think the best way to do it is to extract the old bush before fitting the new one - instead of trying to use the new bush to wind the old bush out. That's how I tried to do it and it didn't go well.  There's a good chamfer on the conrod which helps when fitting the new bush.  Cheers.  Bruce.

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Blue Heeler
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November 28, 2018 - 12:09 pm
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Gawd yeah,never use the new bush as an extractor...too soft a material....and dealing with drag of old and new bush simultaneously,not good.

Are you sorted now?

Blue

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thornebt
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November 28, 2018 - 1:57 pm
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Yes, the bush is installed, oil holes drilled and reamed.  I got the idea of using the new bush to push out the old bush with a bolt and spacer in a magazine article.  Of well, I guess we learn by our mistakes.  Just need to find some time now to fit the barrel and a dry day to get the engine refitted.

Cheers.  Bruce.

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