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D7 Small end bush replacement, Oilite?
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_Paul_
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May 18, 2019 - 5:51 pm
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In a fit of insanity I bought a D7 in boxes and am currently rectifying its many issues.

The small end bush is shot and I need to replace it, is it OK to replace with a proprietary "Oilite" bush or does it have to be Phosphor bronze? will the sintered bearing take the beating?

I see one eBay vendor actually selling Oilite bushes as suitable Bantam small end bearings?

Thanks

Paul

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Cornish Rooster
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May 18, 2019 - 8:52 pm
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Strangely or not I replaced the small end bush on my D1 two days ago (not for the first time), the D1/3's have a phos bronze bush, I thought the D7's had a needle roller ???

If you fit a phos bronze bush you have to ream it to fit the gudgeon pin and you will need an adjustable reamer.

BSA Bantam D1 "150" in use regularly often as general purpose transport, quite a few other bikes as well. Cornwall Area Rep. 

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mikef
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May 18, 2019 - 9:45 pm
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Hi Paul.
    Early D7's had a small end bush, later ones had a needle roller. I have had a look on e-bay and there is a seller stating that his Oilite bearing does not need an oil hole drilled. I have no experience of this bearing, maybe someone else can comment. It also does not mention the need to ream it to fit the 
gudgeon pin. Looking at the bush that Rex Caunt sells, he states that you will need to drill an oil hole and ream it to the correct diameter for you gudgeon pin. A clearance of about 0.002" would be my guess.
You may find the link below useful.
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Hope that helps.

              Mike.

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Cornish Rooster
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May 18, 2019 - 10:07 pm
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I used the Rex Count supplied bush, as said you have to ream out to fit the pin (remove material to get a sliding fit with no play), then drill the oilway holes (make sure the drill is lined up correctly).

Other than that not a big deal, though I have done this before.

BSA Bantam D1 "150" in use regularly often as general purpose transport, quite a few other bikes as well. Cornwall Area Rep. 

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BonesCDI
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May 19, 2019 - 10:45 am
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Cornish Rooster said
I used the Rex Count supplied bush, as said you have to ream out to fit the pin (remove material to get a sliding fit with no play), then drill the oilway holes (make sure the drill is lined up correctly).

Other than that not a big deal, though I have done this before.  

I tend to drill the oil holes first, so when you ream it cleans up the "breakthrough" of the drill bit into the inside diameter.

I don't know if I'd run a sintered bush as a little end bush. I wouldn't think they'd be as durable as a solid phosphor bronze bush. 

Running and project bikes from 1912 -2005..........She hasn't said stop yet.........

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cocorico
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May 19, 2019 - 11:05 am
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** Please log in to view **

please

1956 D3 awaiting a new magneto. 7 other bikes in the Barn, 6 runners and a still in progress Morini 250

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_Paul_
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May 19, 2019 - 11:31 am
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Thanks gents,

I'm not convinced the sintered bush will take the hammering even less so without lubrication holes.

I've ordered an oilite bush from "Simply bearings" to see exactly what you get for your money (£3.84 delivered), though for an off the shelf solution Rex's bush is probably the way to go but at close to £20 it's expensive by comparison.

If the oilite bush doesn't come up to snuff I have a chunk of phosphor bronze bar here I can turn one from.

Paul

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_Paul_
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May 19, 2019 - 11:39 am
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cocorico said
** Please log in to view **...127394.131582..133343...0.0..0.231.2358.0j13j1......0....1..gws-wiz.7XKQd-x3E6I

please  

Thanks cocorico I did try the forum search but my fat fingers didn't find any pertinent reference to using an oilite bush in the small end as opposed to the more common phosphor bronze item, if you have a link to any posts that reference it I would be grateful 😀

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mike p5xbx
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May 19, 2019 - 4:50 pm
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have a read of wikipedia/Oilite
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I really dont think they are suited to a con-rod bearing application
very little rotational movement but high loading pressure
and problems with “Reaming (to size) is not recommended”

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

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_Paul_
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May 20, 2019 - 7:47 pm
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mike p5xbx said
have a read of wikipedia/Oilite
** Please log in to view **
I really dont think they are suited to a con-rod bearing application
very little rotational movement but high loading pressure
and problems with “Reaming (to size) is not recommended”  

I know you shouldn't ream an oilite bush, it was my original plan to press it in and see what the fit was like... 

Just took the old bush out of the Conrod and as well as a bad hacksaw gouge in the bottom of the small end eye it seems to be quite a way undersize, just measured it with a snap gauge and it's not the 11/16" it should be but 43/64" looks like I might have a mix & match crankshaft 😡

The bush also looked like it had been roughly hand filed and had been held in with loctite.

This is getting worse...

Paul

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