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flywheel puller ...
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b175er
saltfleetby
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May 7, 2020 - 4:24 pm
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Hi everybody. For a start I hope you're all o.k. and have not succumbed to the dreaded lurgy. Hopefully we'll be able to have an outdoor get together in the not too distant future. I'm looking forward to it !

Secondly; after the February meeting at Bardney someone said they'd like to buy the flywheel puller (used once) that lives in my shed. Is this still the case or should I advertise it ? Ken.

two B175s and a CB360

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toppo46
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May 7, 2020 - 9:53 pm
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Hi Ken it was me ,yes I still want it please do you want to post it or wait it’s up to you . Changing the subject have you or anyone local had a crank rebuilt as the big end to quote Rex when he looked at the video of it I sent him,of my crank it’s well past it’s sell by date. I just wondered if you knew of someone local that would do a good job.

Regards John

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wildun
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May 7, 2020 - 10:11 pm
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Ken, John,

Chris from Sleaford had his crank rebuilt by a chap out in the wilds near Billinghay, he did a good job. Chris supplied the Rex Caunt conrod kit but when the chap went to fit it, he found out that the bores in the flywheels had been opened out when the previous owner had fitted a 2 thou oversized Alpha crankpin. Chris had to get an oversized crankpin made to suit. So some thing to check out because once the flywheel bores have been opened out to 0.752" you cannot fit a standard 0.750" crankpin. Alpha crankpins can be identified by three lines scribed /punched on the crankpin at each end.

Also, it depends what model Bantam engine you have. Rex Caunt does con rod kits for the later models but not the early D1 with narrow conrod, he can supply a kit for the later D1 with the wider conrod but you have to make/have made a special bespoke small end bush. Or, not local, you send the whole crankshaft off to Alpha Bearings for them to do the complete recondition.

Hope that helps.

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toppo46
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May 9, 2020 - 6:54 am
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Hi Wildun,thanks for your reply I’m not sure who chris is I’ve only met a few of you once at bardney,how would I get in touch with him please. It’s a d10 so no problem getting parts Rex has them in stock,.John

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wildun
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May 9, 2020 - 9:26 pm
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John,

D10 is good then, same con rod kit as D14, 0.750" crankpin. Your standard rod should have a small end bearing with enclosed needle rollers pressed into the rod.

Not sure how to get in touch with Chris from Sleaford, with this current situation we all obviously haven't been out and about. The engineers name, I am pretty sure is Nick Marshall who is down Williamson's Drove, out in the wilds to the north of Billinghay. No idea if he is currently operating or available.

Have a good look at the ends of your crankpin to see if there are any lines punched/scribed/engraved there. If so, then it has previously had an Alpha big end fitted which may well have a 0.002" oversized crankpin meaning that a standard Rex Caunt con rod kit crankpin will be too loose. The con rod itself is no reliable guide to this as sometimes Alpha would re-use the BSA rod but sometimes they would provide their own rod.

There must be more engineering shops that could do the work somewhere if this Nick Marshall is not available.

Hope that helps.

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toppo46
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May 10, 2020 - 8:56 pm
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Wildun

 

Thanks for the info,have checked crank pin and shows no extra marks so looks like it is still original size. I’ve still got some mates to have a word with for any recommendations as I what it done right. I’m not in a rush as I can’t kick it over due to a bad back waiting for surgery but due to the present situation it’s all on hold but ay other people are having it far worse.

 John

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Blue Heeler
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May 10, 2020 - 10:56 pm
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wildun said
....may well have a 0.002" oversized crankpin meaning that a standard Rex Caunt con rod kit crankpin will be too loose......

Decent engineering firm will have knurling equipment to do the flywheel, so as to get a good interference fit back again for the crankpin. I used one in Leicester, `94-ish.

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SpacedMarine
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May 13, 2020 - 4:30 pm
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Have a good look at the ends of your crankpin to see if there are any lines punched/scribed/engraved there. If so, then it has previously had an Alpha big end fitted which may well have a 0.002" oversized crankpin meaning that a standard Rex Caunt con rod kit crankpin will be too loose. 

 

Explains an enormous amount 😁

What's 7/16 in mm again?

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toppo46
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May 14, 2020 - 8:29 pm
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Thanks for your imput SpacedMarine. I’ve got a video of the play that I will post but think I will put in d10 section but here’s a photo of the crank pin Ru6F3TGcT7S5OAe5dKVnlA.jpg

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wildun
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May 15, 2020 - 1:02 pm
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Just to add some clarification on Alpha crankpins. I have two Alpha crankpins, with the identifying marks in my scrap parts box, neither of them are 0.002" oversize, they measure 0.750" and 0.8125", 3/4" and 13/16", standard sixe for D14 and B175. Maybe Alpha only bored flywheels and made oversized crankpins to suit if they carried out the reconditioning in their workshop. If they supplied a con rod kit to a retail or trade customer then I would imagine that they would supply standard dimension crankpins.

So, even if you do see the Alpha identifying marks on a crankpin do not fear the worst. That B175 example in my scrap box was replaced with a Rex Caunt con rod kit with no problems and is running well in my engine several thousand miles later.

I note that on the Bantam Club (Official) Facebook page that Robert Duesbury mentions that he can rebuild Bantam cranks, as do other posters so this service is available but you would have to contact them and send your crank to them

I hope that is of interest to you.

Alpha-crankpin.jpg

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Stoo63
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May 15, 2020 - 1:09 pm
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Mike F , he Club's technical guru on here has also been doing excellent crank work, so well worth sending him a message. 🙂

'52 D1 direct lighting plunger; '58 Square Four (project); '55 D3 Battery; '59 D1 direct lighting plunger;  '59 Tiger Cub; '60 5TA;  '76 FS1-E '97 Honda Sky SGX50.

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wildun
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May 15, 2020 - 1:31 pm
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Thanks Stoo63, yes, that was one name mentioned so should be easy for toppo46 to contact him through this forum.

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toppo46
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May 15, 2020 - 10:53 pm
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Thank you all for your responses, I will make some enquires 

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