It's great to see this ingenious repair to an otherwise irreparable, rare and expensive crankshaft! Your beautifully devised, engineered and installed components ensure that this crankshaft can now return the bike to the road. As a former motorcycle mechanic and motorcycle workshop owner I respect your high standards of workmanship and very well equipped workshop.
Interesting technique. I used to turn back to clean steel and build it up with a type of rod called “ machineoweld” as I recall, then cut new threads. This looks strong and no heat affected zone.
dont understand why many trueing a crank with indicators direkt over the resting point, they need to be as far away as possible from eachother, extremely wrong can look good on the indicators
Yes deflection will be at minimum over resting point. To get the greatest distance it would be best to rest at the outer edges of the crank and measure at bearing location, that will give you the maximum deflection distance.
I'm missing like the middle threads on a crank, had to cut the nut off. I'm thinking I'm going to try and weld onto it and recut the threads. It will either work or it will still be unusable
How much would a job like this cost? If you would do it or if someone else would i just figured i ask becasue you have an idea of the work that goes into doing this
How much force is such a Dowell pin capable of withstanding? Is it possible to press fit 2 50cc crackshafts together and lock them in place using a 4mm Dowell? I am building a twin and this looks like a neath way of connecting the 2. I want to 'hide' the Dowell under one of the bearings for added structure..
I had a similar problem on a Norton International crank, but luckily it wasn't quite as bad and i could turn back to round and pick up the original thread again. Customer was virtually in tears (of joy) when i fixed it.
Easier to make large adjustments with less pin engagement, those pins are tight... As you press the halves together, adjusting becomes more difficult. Best to get it close first, and only need minor adjustments once fully pressed.
Looks good. But couple of questions, 1) did you end up heat treating those threaded rods and nuts? 2) why didn’t your cut off those damaged threaded and drill a shallow centre hole and weld new threaded rod and chase with a die? Would that’ve been easier than pressing and pinning? And wouldn’t have had to cut a key way?
I lost my temper once with a cr 125 crank, when I was younger and didn’t know better 😂. Would have loved to have known you at the time. I had to buy a new crank.
Hi Paul X, what is the acceptable runout for the DT125 crankshaft? If I'm not mistaken, I saw about 0.03mm when you were done. I'm about to try and align a crankshaft myself. Thanks
beautiful work.....a replacement crankshaft for this item can be found on ebay for $100 .... your cost of raw stock to do the repair is about $2 .... but your labor must be between 2 to 6 hours ..... is it economical for the customer to repair crankshafts on items like this?
Interesting repair idea. But since you had to make new threaded sections for both side, why not make totally new inserts with the threaded section and not just inserted parts. Seems like making the thread parts was harder then making new parts with threads cut on those new parts. IDK, just asking... Thumbs Up!
I have to say I wouldn't leave the house except to go to the garage to work with these wonderful machines at this point there would be no reason to leave the garage! sorry honey...
Nice work Paul but for me i prefer to true up a crank between centres so would need to machine the od of the material to make sure its concentric to the centre hole....just a small thing apart from that found your video interesting
Lol , the dial gauges are running almost on top of the rollers ! You aren’t measuring how much runout the crank has , you are measuring how oval the journals are . The rollers need to be much wider ( like on the threads ) , but I doubt they are true enough to do that .
Не вопрос! При хорошем оборудовании можно сделать много всяких деталей, но зачем терять время на стандартные гайки продающиеся в любом магазине запчастей?!
Whatever that size This crank is It’s just faster to order a new one ,they’re just too cheap nowadays to waste the time doing this . No disrespect to the person who’s doing this .
OMG...Hammer on crankshaft....My God...Never,ever this service and repair,only in Vietnam,India,Bangladesh...Will be broken soon!Never doo this!No way!
Spectacular work. To have all the tools and supplies to do this kind of repair is awesome. You're an artist and gifted machinist!
nice to see...im up to fixing my crank on an old yamaha dt 125 -1984....awsome video...thanks
Oh my God! That's absolutely brilliant, great work...
It's great to see this ingenious repair to an otherwise irreparable, rare and expensive crankshaft!
Your beautifully devised, engineered and installed components ensure that this crankshaft can now return the bike to the road.
As a former motorcycle mechanic and motorcycle workshop owner I respect your high standards of workmanship and very well equipped workshop.
Thanks
I normally weld it then lathe and cut the thread . saves all the other steps and crank strength isn't compromised . interesting video anyways .
Thanks
Heat affects the high carbon steel. I would have his repair before yours
Both sides of crankcsse beaten to death and intelligently and skilfully saved at last.Good job.
Thanks.
Interesting technique. I used to turn back to clean steel and build it up with a type of rod called “ machineoweld” as I recall, then cut new threads. This looks strong and no heat affected zone.
Thanks
dont understand why many trueing a crank with indicators direkt over the resting point, they need to be as far away as possible from eachother, extremely wrong can look good on the indicators
Exactly correct..
Not only that, all he had to do is re-cut the threads, and you can do that without taking the crank apart.
Normiewho why not make things complicated it on can. Most of the audience won't know anyway...
Yes deflection will be at minimum over resting point. To get the greatest distance it would be best to rest at the outer edges of the crank and measure at bearing location, that will give you the maximum deflection distance.
A real engineer at work ,great skills 👍
Thanks
Perfect workmanship. The best of the best.
I'm missing like the middle threads on a crank, had to cut the nut off. I'm thinking I'm going to try and weld onto it and recut the threads. It will either work or it will still be unusable
Mr Paul have you a job , that change big pen litle bit advanced or another word stroke up ? If you ever there is video on it?
How much would a job like this cost? If you would do it or if someone else would i just figured i ask becasue you have an idea of the work that goes into doing this
How much force is such a Dowell pin capable of withstanding?
Is it possible to press fit 2 50cc crackshafts together and lock them in place using a 4mm Dowell?
I am building a twin and this looks like a neath way of connecting the 2.
I want to 'hide' the Dowell under one of the bearings for added structure..
Definitely thinking outside of the box. Great way to repair a hard to find crank.
Thanks.
I had a similar problem on a Norton International crank, but luckily it wasn't quite as bad and i could turn back to round and pick up the original thread again. Customer was virtually in tears (of joy) when i fixed it.
Super .
how Nweton meter your crank saf？
Lol, I always thought there was a high precision method used in trueing a crank, glad to see the old faithful hammer is that method :)
Same here.. 🤣
Olpol
Looolollolooo
@@mangkoes lllllllllll9lñlllllñl
Tailstock needs aligning
Great content man, but it appears your mill and lathe both need some PM. The runout and lack of precision of those machines blows my mind
Great way of doing it. Can’t wait for the day I get a lath and milling machine. Happy days
Thanks
Would you explain, why should you centering crank shaft in three phase?
Easier to make large adjustments with less pin engagement, those pins are tight... As you press the halves together, adjusting becomes more difficult. Best to get it close first, and only need minor adjustments once fully pressed.
Zastanawia mnie pomiar bicia w mieiscu podparcia wału?nie sprawdzałem ale wydaje się że zawsze wyjdzie na zero?
Looks good. But couple of questions, 1) did you end up heat treating those threaded rods and nuts? 2) why didn’t your cut off those damaged threaded and drill a shallow centre hole and weld new threaded rod and chase with a die? Would that’ve been easier than pressing and pinning? And wouldn’t have had to cut a key way?
Hi thanks.
Material of new thread pins and nuts - 42crmo4+qt - hardened steel.
Welding of engine parts is not a good way.
@@PaulXchannel I like these spec's. Was concerned of otherwise non heat treated materials here.
Did not look centered to me in the end
Do you do repairs for people?
Is there anyway I could have you repair a crank I have that had the flywheel side threads snap off?
I lost my temper once with a cr 125 crank, when I was younger and didn’t know better 😂. Would have loved to have known you at the time. I had to buy a new crank.
You will use it in the future.
@@PaulXchannel were your location
Good job. Lot of work though for a relatively cheap bike.
Thanks.
It was a help for beginning moto biker.
How much you charge for a crankshaft repair?
Hi Paul X, what is the acceptable runout for the DT125 crankshaft? If I'm not mistaken, I saw about 0.03mm when you were done. I'm about to try and align a crankshaft myself. Thanks
Optimum deviation on undamaged crankshaft up to 0.02
Great mechanical engineering👍. I like it and inspiring
Thanks.
Nice work, thank,s
Damn bro...your talent knows no bounds ... never seen anything like this 😍🔝
Thanks for watching
beautiful work.....a replacement crankshaft for this item can be found on ebay for $100 .... your cost of raw stock to do the repair is about $2 .... but your labor must be between 2 to 6 hours ..... is it economical for the customer to repair crankshafts on items like this?
Thanks.
It's a hobby.
Free for a friend.
Interesting repair idea. But since you had to make new threaded sections for both side, why not make totally new inserts with the threaded section and not just inserted parts. Seems like making the thread parts was harder then making new parts with threads cut on those new parts. IDK, just asking... Thumbs Up!
Hi thanks. There are many ways to fix this. I will show more in future videos.
Центровка сделана не убедительно :( Вы измеряете круглость цапф и радиальное биение подшипников а не соосность поверхностей цапф.
Figuring in shop time it's cheaper to buy a new crank but nice repair work.
Thanks
You are simply great!
The effort and patience you put on is simply amazing!
I wish i had somebody like you back in my country!
Thanks
Your work is incredible man! Love the videos
Thanks
Love your balancing tool.. 👍👍
In my opinion this kind of overhauling means an immense weakening of the crankshaft. Hopefully everything (still works well.
Of course there is weakening of the crankshaft but work well.
This is great job
Não seria mais fácil tornear um novo?
Cara vc é bom demais....que trabalho excelente parabéns pelo seu conhecimento. E profissionalismo...
Excellent job. Thank u.
Professional work! I'd never seen a crankshaft holder for balance like yours. Where in can buy one?
Thanks.
The holder is homemade.
@@PaulXchannel excellent craftmanship 💪💪
How many tons of pressure does it take to press out the crankshaft pin?
I do not know. My press is up to 50 tons.
May i have you permission to put a certain of this video om tiktok
Thanks! Nice job, weird, but nice job anyway!
Great job ! Would it be possible to send you my crankshafts to refurbish them ?
I have to say
I wouldn't leave the house except to go to the garage to work with these wonderful machines
at this point there would be no reason to leave the garage!
sorry honey...
Where did you find the keyway mill ?
I think the coast of the repair is =or+ than new crankshaft
It’s great job .
Thanks
Increible,👍👍 perfecto el mecanizado
U have petrol or oil in your vains... damn nice this... u are a brother from a nother mother to me😘
Nice work Paul but for me i prefer to true up a crank between centres so would need to machine the od of the material to make sure its concentric to the centre hole....just a small thing apart from that found your video interesting
Thank you very much.
This is one way of repairing
crankshaft.
I will do a different way to repair in future videos.
I might have been tempted to omit the centre drilling altogether so as to not confuse the next person truing up the shaft.
Where you located at?
Super impressed
Nice Good Information
Thanks
had to mute the sound, the high notes on the music hurt my ears, excellent vid tho
just one word!! Wonderful..thx
Thanks
Lol , the dial gauges are running almost on top of the rollers ! You aren’t measuring how much runout the crank has , you are measuring how oval the journals are . The rollers need to be much wider ( like on the threads ) , but I doubt they are true enough to do that .
Thanks for opinion.
Some manuals actually specify where the rollers and dial gauge should be placed , but generally the further apart , the more accurate the reading
@@grantfuller2016 I know but on left side is groove and in right side is the taper with groove.
@@PaulXchannel a tight fitting sleeve over keyway might have helped.
@@chrisstephens6673 yes
Nicely done Man!
Thanks
Were your location
You decreased the strength of all shaft.
No kidding...this guy is a complete idiot.
Not to mention the lack of proper heat treatment of the added threaded shafts and nuts. My main concern would be on the Rotor(flywheel) side.
Trabalho magnífico de profissional inteligente!
Nice work, in a way. But I definitly do not agree on the pins!! You could have it more tight and use Loctite...
The hexagon nut lifts the threaded pin without the locking pin.
The Loctite have don't so power.
It work well.
Genialna robota!
How the F did it get damaged like that?
j adore ce boulot c est ca que je veux faire
Excelente trabalho de recuperação e o custo de horas e ferramental compensa ?
Thanks. Work is my hobby.
the one that took that crank out of the blok mustve been wailing on it with a steel hammer , man thats as bad as i seen them
Precise execution possible. It takes a lot of experience. Congratulation :).
Thanks.
How much do you charge and how can I get in contact with you
Hi. Nice job Paul. I like the safe side with 2 locking pins. Thru running of both bearing areas is the difficult part of the work. 👍
Thanks
Love your work. The whole deal from an engineering side and technical expertise of the presentation. Music was terrific
Thanks
@@PaulXchannel i agree, only I couldnt stand the music
San po location mo po
Güzel işçilik tebrik ederim
I learned to do this when I was in school 😀
Wow that’s some school ..where’s that
@@donbrashsux it was in 1976 in France
Cool 🖒
But how does a crankshaft get damaged like that?
I assume the hammer. They are also worse.
Is there any way to repair connecting big end pin hole.
Yes, it is possible.
@@PaulXchannel ..do you have any videos of that
Why not make inner thread into the crankshaft?
merci bouqeau
Loctite 638 stops working in 300C temperature. Plus oil in engine.... Not sure
Great help for us mechanics. 300 C - good limit.
seriously respect
Thanks
Не вопрос! При хорошем оборудовании можно сделать много всяких деталей, но зачем терять время на стандартные гайки продающиеся в любом магазине запчастей?!
They beat the crapp out of that thing !
Super , good job
good job
Very Nice!
Thanks
Good work, what material do you use to make this
Thanks.Hardenned steel 42CrMo4+qt
If only somone would have taken it apart correctly......
WTF mind blown 🤯
Whatever that size This crank is It’s just faster to order a new one ,they’re just too cheap nowadays to waste the time doing this . No disrespect to the person who’s doing this .
Hi. This channel is about repairing damaged parts.
Ordering a part is easy.
What grade of steel rod did you use.
Material - 42crmo4+qt
AS 1444-4140 Is the Equivalent. Awesome.
OMG...Hammer on crankshaft....My God...Never,ever this service and repair,only in Vietnam,India,Bangladesh...Will be broken soon!Never doo this!No way!
Don't be an idiot, everybody uses a brass hammer, vice and v wedge to true a crank.
4:57 song title please?
Indonesia 🇮🇩
Hadir
Un lavoro esagerato....solitamente si riporta materiale con saldatura e si rifletta. Così ha anche indebolito la struttura stessa Dell albero..