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D14 Small End Bearing
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billywhizzz
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November 5, 2018 - 8:36 pm
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So this what I found when rebuilding a D14 engine I bought at the weekend, a purpose made Brass bush to replace the needle roller, not sure why anyone would do this, the rod end is fine.

 

Shaun[Permission to view this image is denied]
e.

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_Paul_
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November 5, 2018 - 9:31 pm
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Did a previous owner use an oversize Suzuki piston?  the Suzuki uses a 15mm pin and standard D14 is 9/16" common practice to machine a (phosphor bronze) bush to fit?

Regards

Paul

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billywhizzz
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November 6, 2018 - 8:47 pm
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Hi, its a standard pin, so its just a bush made to replace the needle roller, odd but not wrong, just not as good as a needle roller.

Started stripping the bottom end, its like new for what is a very old engine.

Shaun

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November 7, 2018 - 8:20 pm
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The original needle roller small ends could be problematic.Nasty tin housing with loose fitting needles.Easy to scrunch up when "pressing" into the rod,as I found out once with a sub-standard new one...looked ok but pin turned in bearing like a thrupenny bit,suggesting I`d rippled the tin housing in the rod.Fitted it exactly the same as had done with them previously.With the ones that went in ok,I always breathed a sigh of relief when they pressed home.

I still have the long bolt-spacer-washer puller kit I put together,that I`ve used to fit various Bantam small ends over the years,but some use a vice.

Maybe the owner had access to a lathe and knocked one up for nothing more than 1/2 hours work. 

Blue

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billywhizzz
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November 8, 2018 - 7:43 pm
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Yep I think the last owner just had a lathe so knocked  up a bush, will change it to a needle roller and yes care needs to be taken when fitting, plain bearing is a good solution for a 4 stroke, 2 stroke less so with the poor lubrication.

I note bearing from Rex Caunt says push in using the lettered end.

Shaun

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Peterg
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November 8, 2018 - 10:34 pm
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billywhizzz said
Yep I think the last owner just had a lathe so knocked  up a bush, will change it to a needle roller and yes care needs to be taken when fitting, plain bearing is a good solution for a 4 stroke, 2 stroke less so with the poor lubrication.

I note bearing from Rex Caunt says push in using the lettered end.

Shaun  

Or he could have fitted a D7 small end bush

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Blue Heeler
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November 9, 2018 - 12:41 pm
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billywhizzz said

I note bearing from Rex Caunt says push in using the lettered end.

Shaun  

Ah,maybe that`s where I went wrong,was over 15yrs ago,got another one to do before next spring,so cheers for that info.

Hope yours goes to plan.

Blue

 

N.B. I also have a sleeved down to 125 D14 barrel here somewhere that`s been run,I seem to remember the piston pin with that has some weird contraption to make up the dia between the pin and D14 rod.

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billywhizzz
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November 9, 2018 - 8:42 pm
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Peterg said

Or he could have fitted a D7 small end bush  

They are a smaller OD?

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Peterg
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November 10, 2018 - 10:24 am
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I don't know but I thought I fitted a needle bearing to my D7, but that would be some 30 years ago so my memory could have easily failed me!

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mike p5xbx
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November 10, 2018 - 11:38 am
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Peterg said
I don't know but I thought I fitted a needle bearing to my D7, but that would be some 30 years ago so my memory could have easily failed me!  

i Know that feeling cry
but you probably did
late D7 had a needle roller bearing 3/4” OD
early had a bush 11/16” OD and different conrod

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

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November 10, 2018 - 8:55 pm
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Peterg said
I don't know but I thought I fitted a needle bearing to my D7, but that would be some 30 years ago so my memory could have easily failed me!  

I bought a job-lot of D7 parts ten years ago,that included two standard-looking mucky old bottom-ends,and one has a needle roller small-end,just like my D14`s do,I thought it must have had a replacement rod fitted,but after what Mike has pointed out,I`m now educated 🙂

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mike p5xbx
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November 11, 2018 - 5:32 pm
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on the subject of needle roller bearings I was never very happy that the ones you can buy now do not have an oil hole and the one in my D14 has started rattling after only a few hundred miles
so have cut an oil hole in the new one
only time will tell if this was a good idea or not wow

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nickjaxe
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November 11, 2018 - 9:17 pm
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I did think of doing that once...then I thought of the wafer thin edges the needle may run over.

I thought about drilling a hole as well....but could I remove the jagged internal edge??

Hope it works...needs a good supply of oil for sure.

Not much rotation but still moving.

My Bantam video              https://www.you.....jpOFmzRZRI

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