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GrandPaul
GrandPaul
Leander (Central) Texas, USA
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reverb Offline OP
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Hi; I want to buy one in fine condition.

Thanks

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will a 73 crank work do you need rods ?

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Mind the differences between years re: bearing sizes...

Last edited by GrandPaul; 02/03/21 1:18 pm.

GrandPaul (does not use emoticons)
Author of the book "Old Bikes"
Too many bikes to list, mostly Triumph & Norton, a BSA, & some Japanese
"The Iron in your blood should be Vintage"
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Differences? Please inform us.

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There is the early diameter crank shaft and the later (metric) one...

I just can't quote this stuff from memory any more, and I don't keep my tech manuals on my little desk in this new house, as I'm out of the business and really shouldn't need that stuff any more...

BY ALL MEANS, FEEL FREE TO CORRECT ME!!

Last edited by GrandPaul; 02/03/21 1:18 pm.

GrandPaul (does not use emoticons)
Author of the book "Old Bikes"
Too many bikes to list, mostly Triumph & Norton, a BSA, & some Japanese
"The Iron in your blood should be Vintage"
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Sharing your ignorance is not helpful.

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I believe what you are referring to is that preproduction 750s were 650 rod length then production 750 were shorter rod length There was also a main bearing change there inch to metric I believe

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Originally Posted by Ken Hosford
I believe what you are referring to is that preproduction 750s were 650 rod length then production 750 were shorter rod length There was also a main bearing change there inch to metric I believe
Removed reference to stroke being crank related.

It's still down to bearing difference...


GrandPaul (does not use emoticons)
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"The Iron in your blood should be Vintage"
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You've added nothing of value to Fernando's inquiry, Mr Zuniga

650's and 750's were 82mm stroke. And stroke IS crank related.

The change from inch to metric timing side bearings happened in 71. On 650's.

A change in bearing clearance for 750's happened around 76.

I take issue with your initial response because I (and others) have a lot of time invested in helping Fernando have a successful outcome with his T140. You spouting nonsense will do nothing to achieve that end.

"Better to remain silent and be thought a fool than to speak and remove all doubt"

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Fernando,
It is quite difficult for us all, being remote, to fully understand the 'fissure" in the crank.
There is obviously something wrong there so I suggest that you strip out the crankshaft and take a couple of good photos of the affected area of the crank.
You are going to have to strip the engine to take out the crankshaft anyway ---so why not do it now so that we can all try to help you to identify the problem and also the cause of the problem.
As Mike says--several of us will help as much as we can to assist you in overcoming this problem.
HTH

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reverb Offline OP
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Hi guys; thank you for the support.
I am trying to finish (if I can) with a project Triumph to have a vehicle...hence I let this other bottom end there; thinking that what s the point if the crank is just useless right now.
You know I do not have a workshop dedicated (AKA space) so I have the bikes etc in a bedroom and if I dismantle all I do not have a place to put the stuff; in a good way and secure (I had 3 floods in the past 4 years)

I asked 1 shop in USA if have one to sell; do not have. Also said that the T140 cranks are all the same except of course the TSS ones.
I asked other shop in UK but still waiting for the response.
Tinkerertoo (Mick) in UK checked what he has but no luck there.
I sent an email to a workshop in USA asking and I am waiting for the response.

There is a person in UK that in the past I bought many things. He breaks 750 s. Every few months he has a crank in STD condition (journals) to bid or sell and normally are from 1979.

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Fernando-- I understand your space constraints.
However--can you take photographs of the fissure as you see it?--and post them here.
It will give us all a much better idea of the problem.
HTH

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Originally Posted by Mike Baker
I take issue with your initial response ...

My initial response did not DIRECT him to do anything, and did not give any false information, it was just a comment regarding differences that exist between models.

As you so eloquently stated - THERE ARE INDEED DIFFERENCES.

I think your reaction is over the top.


GrandPaul (does not use emoticons)
Author of the book "Old Bikes"
Too many bikes to list, mostly Triumph & Norton, a BSA, & some Japanese
"The Iron in your blood should be Vintage"
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I have a std t140 crank for sale BUT it has the alternator extension cut off
as it was going to be used on a racer. I have fabricated an extension and
drilled 2 drive location pegs which go into the sprocket for the rotor.
Post will cost a fortune but if you are interested let me know.
BTW there is no flywheel on it.

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Hi Niquel; I am in a location that is better to buy a complete one. 18kg is what a crankshaft weight; I think.

Thanks


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