mr
2nd Class Ticket
Posts: 6 
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Post by mr on Oct 21, 2017 15:14:02 GMT
Anyone know where I can source a suitable sized small end bearing for Vespa Sprint genuine Piaggio ref 3760/S conrod, basically I have removed the old brass bush type bearing to replace to needle bearing, tried and these are all to loose, no markings either on top of crank to determine what oversized bearing would be suitable the aperture is approx 19-20mm if anyone can help out there this would be great the standard 15mm x 19mm x 20mm are to loose.
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Post by henri on Oct 21, 2017 16:39:47 GMT
basically you cant , the hole size is odd an the metal isnt treated to be suitable for a bearing to run in , the cost of having it changed/treated or of replacing the conrod will be more than a new crank with a bearing little end . H
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mr
2nd Class Ticket
Posts: 6
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Post by mr on Oct 21, 2017 19:41:23 GMT
Ok could thanks for the clarification, do you know any suppliers who can supply a brass bush.
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Post by henri on Oct 22, 2017 7:29:56 GMT
any engineering shop ,or bearing supplier should be able to supply a blank , they come slightly oversize an will need reaming to size after fitting .https://simplybearings.co.uk/shop/Bearings-Oil-Filled-Bronze-Bushes-Oil-Filled-Bronze-Plain-Bushes/c3_4511_4770/index.html . H
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mr
2nd Class Ticket
Posts: 6
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Post by mr on Oct 22, 2017 16:20:32 GMT
Thanks for the information I have found some on line it’s a material called oilite it should do the job, it’s a bronze/brass material they also do the size I need, hopefully they will fit  when they arrive. |
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Post by ironsloth on Oct 23, 2017 8:00:00 GMT
Dam, just read the post and was going to say you want an oilite bush....
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Post by henri on Oct 23, 2017 9:24:34 GMT
the link i posted is to a oilite bush ,oilites a brand name,others are available but oilites the best .H
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Post by ironsloth on Oct 23, 2017 9:59:53 GMT
Didn't read your previous posts either, spent 6 hours in a and e with the missus, a cat bit her and her wrist has swollen to the size of a large thing......
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Post by henri on Oct 23, 2017 10:07:02 GMT
hope she's better soon , cats teeth are dirty things ,no opposable thumb so using a toothbrush is a bit tricky .prefer dogs meself . H
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Post by ironsloth on Oct 23, 2017 10:09:22 GMT
Same here, I have an Ibizan hound/Whippet, only helped the f**king cat as it looked like it had been attacked by summat! They can all sod off now!!! 😆
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Post by henri on Oct 23, 2017 10:11:18 GMT
no good deed goes unpunished eh . H
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mr
2nd Class Ticket
Posts: 6
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Post by mr on Oct 31, 2017 19:16:23 GMT
Dam, just read the post and was going to say you want an oilite bush.... Hi, got some 19mm standard oilite bushes they appear to fit but not tight into conrod are these ok to spin on both faces or would I need to ream down so the outer face gets pressed into the conrod? |
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Post by ironsloth on Oct 31, 2017 22:45:19 GMT
I would have thought you would want an interference fit going into the Conrod....
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when they arrive.