How to old technique rebore block cylinder motorcycle

[@Sonomaniaque]

I've done this type of boring on my Honda Amigo PF 50. I held the cylinder in the mandrel by the bottom of the sleeve. Boring the cylinder was relalatively easy, but the most challenging task was to adjust the clearance between the piston and the cylinder to be constant all over the length of the bore. I had to adjust between 5/100 and 7/100 mm, and it took a lot of time. But in the end, it worked flawlessly. In the video, we can see the piston is too tight. No honing, no cross hatch. This piston is gonna seize, as many noticed!

[@МаксимКудеров-у5о]

Все дело в том, автор неучел нагрев при обработке, загатовка остыла и удивила его.

[@ChalesPiccinini]

Muito apertado

[@111455]

As far as engine building I could be considered a beginner as I've done a hand full of rebuilds, but seeing him have to use TWO THUMBS to push a bare piston without rings down the bore made me cringe soo hard! had this man never learned of thermal expansion or just how critical piston-to-bore clearances are?

[@us4747]

​@@МаксимКудеров-у5о No no...ha avuto fretta e così ha ripetuto il lavoro. Ha fatto anche un altro errore che nessuno dice, la parte inferiore del cilindro deve essere qualche centesimo più larga di quella superiore e lui ha fatto il contrario.

[@anteneupitra]

COMMENTS IN THE COMMENT SECTION WILL BE MORE INTERESTING THAN THE weird VIDEO.

[@georgecooke9010]

I HAND LAP PARTS TO .0005" TOLERANCE SO THIS LOOKS DOABLE.A LOT OF HIGH PRESSURE PUMPS DON'T USE GASKETS AND DONT LEAK SO A 2CYCLE CYLINDER MIGHT BE OK IF .0015 OR SO TOLERENCE IS MAINTAINED. UNTIL SEING IT DONE I DIDN'T PONDER IT. NOW I HAVE TO TRY IT!I CLEANED UP A CYLINDER THE SAME WAY BUT IT IS TOO LOOSE. I'LL BUY A .5 MM OVERSIZE PISTON AND RESIZE THE CYLINDER. THANKS FOR THE DEMO, IT LOOKS GOOD AS LONG AS I CAN KEEP THE BORE STRAIT OR MINIMUM TAPER. THANKS AGAIN.

[@robertoudokrapf453]

OLÁ 28/10/24 Deu para notar que tens pouco conhecimento de medidas, tolerâncias, e muitos outros fatores que influenciam em uma análise de motores com referência ao AL. Tolerâncias de 0.00?mm refere-se, em apenas cubo e pinos de pistões de alta qualidade. Considerar, em alumínio tolerâncias ou medidas na ordem de 0.000?mm (décimo milésimo de mm) é simplesmente um absurdo. Roberto Udo Krapf (Analista de motores)

[@bigbelconut]

Piston being to tight is only one of a bunch of problems. It's going to seize and if it doesn't the smooth bore with no cross hatch is going to smoke.

[@Toomanytoys1963]

For true accuracy, he should have drilled the holes in the fixture on the lathe. When making a fixture, the best practice is to never remove the fixture until you have finished all of your machining. If you do, you need to chuck it in a 4 jaw chuck, and true it with dial indicators. I just demonstrated this to a friend a couple of days ago. I had made a holding fixture to shorten some VW cylinders to lesson the piston deck height. After I had done this I told him to watch the fixture. I pulled it out of the three jaw chuck, and put it right back in. Turned the lathe on, and you could see that the fixture was no longer spinning true in the lathe.

[@us4747]

Lui ha sbagliato anche la misura della piastra, il foro in cui inserisce la canna è almeno 0,2 - 0,4 mm più largo, infatti quando mette su il cilindro gli cade in avanti. Ha fatto molti errori...

[@mkrp4]

or at least marking your fixture relation to the chuck

[@holeshot406]

Agree it’s too tight. How many .000 clearance ? Maybe.002, barely need to install rings !! As soon as that piston heats up and becomes round…it will seize tight. Nice job on the lathe, ruined by fitting it waaay too tight. Too bad.

[@taraknathchoudhurisciencet6492]

.00000000000008

[@Dogslegal]

Pode deixar 005 centésimos que aí não tem perigo de quebra

[@Dogslegal]

Se ele comprar um micrômetro e um subto fica perfeito

[@трубохранитель]

Yes👍

[@nevinkuser9892]

​@@DogslegalHow do you know?

[@игорьб-м3м]

Поршень должен медленно опускаться под своим весом. Слишком плотная посадка, будет клинить двигатель.

[@РусланНиколаев-ф3я]

Там тепловой зазор надо дать 5-7 соток тогда будет норм.

[@seriw-196]

Это делается на координатном станке но не на токарном это для кого показывают

[@павелпопов-у7ь]

@@seriw-196куда мы катимся. идите егэ учите.зачем тебе координатный станок что тут 2и больше цилиндров чтоб точить.а чтоб не выделыватся с креплением можно и 4 кулочковый патрон поставить.

[@seriw-196]

Вот с такими спецами и прикатились

[@robertoudokrapf453]

Não é tão simples assim

[@Timothy-Wess]

Need more space for thermal expansion.

[@SryImMinimal0815]

he will learn at the hard way soon :P

[@borec326]

@@SryImMinimal0815 :D

[@zugzug1107]

Agreed

[@draywanda]

He should have answered his phone... It was the entire internet trying to tell him that ain't gonna work...

[@anteneupitra]

hes gonna learn it the hard way...

[@maxwebster7572]

It was the sandal truck calling. Gonna be late, lost souls.

[@alextiganik]

Ждем ролик о заклинившем моторе.

[@us4747]

😂😂😂😂😂

[@АлексБог-ю8е]

Если правильно расточен, то поршень смоченный маслом, и закрытым с одной стороны цилиндр должен медленно опускаться и это будет самая правильная расточка.

[@FernandoAlves-hf8vk]

Ovalizou geral!!!kkkkkk

[@johnbeckett2624]

As others have said that piston is much too tight, it should be able to drop down the bore under it's own weight with no rings fitted.

[@Sonomaniaque]

excellent method to test the clearance!

[@stancoleshill8925]

It's so refreshing to see an intelligent comment for a change. Thanks so very much.

[@johnbeckett2624]

Thanks for that, I use to build engines and was also involved general machining, reborning and crank grinding pretty much anything to do with engine repair so I do know a little bit about it, although I have never seen a cylinder rebore done like that but it could work with more precise meshing equipment and a decent honing tool. @@stancoleshill8925

[@anteneupitra]

@@Sonomaniaque LOL

[@kubi1110]

Nothing like this in my yamaha 125cc piston was fitted tight after 50k km it worked well not eating oil ot whatsoever. It came like this from factory

[@RogerDurham-v9s]

I don't know about motorcycles, but my dealings with B&S engines, go carts was interesting. Aluminum cylinders are a lot different than a cast cylinder. I finally had pretty good success honing it to very close to size, then using crocus cloth to finish it, as the rings needed a mirror finish not to wear the cylinder.😊

[@robertoudokrapf453]

OLÁ 28/10/24 Engano seu... Falta-lhe um bom curso...RUK

[@RogerDurham-v9s]

@@robertoudokrapf453 You are right about that😂

[@robertoudokrapf453]

OLÁ ROGER. É bastante difícil se adaptar em um mercado preparado para "use uma vez e depois jogue fora" Na realidade o consumidor final está sendo tratado pelas montadoras como o bobo da vez. Quanto ao brunimento ele se faria necessário pois o acúmulo de óleo que provoca na superfície do cilindro é necessário para assentar os anéis. (trabalhei muitos anos na Cofap). Temos uma luta pela frente para sobreviver. As montadoras nos querem fora do mercado. Parabéns pela sua iniciativa. 29/10/24 Roberto Udo Krapf

[@polvincompoundsadmin5402]

You keep taking it out of the chuck and putting it back- never do that- once it is centric and bored never take it out until you are finished. Also way too tight. Bike will seize and negate all your work.

[@bradcarson1967]

Agreed, also only clocked the front of the boar,should off clocked the back also to make sure its parallel before line boaring

[@cryon7260]

That I found irritating too.

[@janvanruth3485]

@@bradcarson1967 the back is not an indicated off surface... as long as the front surface is perpendicular to the boring direction it is ok.

[@robertoudokrapf453]

@@bradcarson1967 Olá. Você sabe o que é cronometrar? QUE BOM... 28?10/24 RUK

[@robertoudokrapf453]

@@cryon7260 28/10/24 É verdade! Tanto o conhecer como o desconhecer podem causar irritação para quem não quer aprender...RUK

[@pauljanssen7594]

If you don't have a bore Gage you're supposed to check the Piston clearance with a feeler gauge. The Pistons too tight.

[@bustjanzupan1074]

What about some measuring with more accurate measuring devices/tools ?

[@maxwebster7572]

So you have curved feeler gauges? Where do I buy them? Let me know when you figure it out.

[@thesep1967]

That's the scrap metal dealer calling at 7:27 ...

[@Pete-ou4cq]

🤣🤣 Brilliant!

[@ВладимирТышкевич-ф3о]

Мастер от бога, по ходу про тепловой зазор понятия неимеет, самая прецизионная сборка которую я видел, и вот ещё, сначала закручивал все накидником, а откручивал уже Шуриком, видно силы покидать начали😂😂😂

[@darkovbarbora]

Ještě přiber půl stovky tou honovací hlavou jinak to po nastartování zadřeš. Správně vybroušený válec s pístem umytý v petroleji, vyfoukaný vzduchem a namazaný motorovým olejem s nízkou viskozitou a vložený píst musí plynule projít válcem vlastní hmotností za 2-3 sekundy a nesmí se samovolně zastavovat.

[@НиколайПетров-б2ш]

Ты просто токарь от Бога!!! А точнее человек прихват!!!))))))))

[@robertoudokrapf453]

Quem "agarra" deve saber a hora de soltar... O resto é papo furado 28/1024

[@adoreslaurel]

Fellow I knew years ago opened the bore on a 1920's Rolls Royce by allowing the bore to rust out a bit, don't know how long it took before sanding out the rust repeatedly to accomodate the incredibly expensive piston set he had manufactured took.

[@ЯрославТищенко-ц5ы]

идеально сделано, по тихоньку на холостых прикатать на месте и вообще шык получится, я только так точу себе, за 10ть лет ни разу проблем не было. Идеальная работа👍

[@alexvelotavr3881]

шкуркой нельзя было хонинговать, абразив в металл набьется, потом сточит все в разы быстрее

[@ЯрославТищенко-ц5ы]

@@alexvelotavr3881 нереальная чушь.

[@ЕвгенийМиронов-к3ж]

Такому мастеру да от души в руки насрать.

[@you-i2j7r]

Одобрямс: "в руки насрать".

[@robertoudokrapf453]

OLA´ 08/11/24 Coração se dá ao adotar uma criança. Minha esposa e eu o fizemos com amor com a intenção de corrigir erros de outros. (também fomos felizes por termos o feito). Minha vida profissional (num total de aproximadamente 60 anos) 45 anos foram dedicados a ensinar "in loco" a técnica de motores. Fui homenageado por alguns e roubado por outros. Alguns que me roubaram me perseguiram por décadas. O que faço na internet ? Dou "colher de chá" para quem no mínimo tenha a colher. Roberto Udo Krapf

[@ВладимирТышкевич-ф3о]

И срать каждый день, пока руки говном непропитаются, и он поймёт что где-то споткнулся😂😂😂

[@Бунифатий]

Кольца можно и не устанавливать! )) удачи

[@AndreyLaran]

зря докапыветесь все учатся на ошибках кто то на чужих а кто то на своих помню тоже лет 25 назад обточил 1 ремонт напильником и пихул в номинал горшок карпат да поплотнее) Чтоб ресурс был огого и компрессия) Про напильник шутю- на школьнике сточил и да сделав шикарную геметрию поршня круглую кгурлую и цилинриную есл не считать кривизну конусящего станка

[@ВладимирТышкевич-ф3о]

Компрессия будет и так ураган а под нагреется вообще будет как у дизеля😂😂

[@robertoudokrapf453]

Nem casando?

[@seral777]

@@AndreyLaran школьник пушка, главное понимать что такое допуски и чем моно пренебречь, для достижения нужного результата.

[@kubi1110]

You shoud widen it by .03mm its way too tight 😅

[@robertoudokrapf453]

É verdade... e se usar camisinha será que aguenta?

[@panther105]

Torques down the bolts with no washers or plates..!!??? You are fired!!

[@cm5838]

I’d say it’s a couple hundred thou off. My concern is that it seems to be tighter at the base leading me to believe there was too much deflection in the boring tool.

[@robertoudokrapf453]

Oi cm Me parece que você também não entende nada RUK 28/10/24

[@ArcAngel572nc]

That piston will seize in the bore. Piston to wall clearance should be a minimum .002 so the bore must be .004 larger than the piston. After correctly sizing the bore it needs to be honed with a flex-hone to get a nice 45° degree crosshatch so the wall will properly hold oil to lubricate the piston.

[@wreckum56]

We used to this in the 60’s on small bore and big bore except we just used a ridged stone hone and it worked just fine.

[@angelobergamelli5153]

Con pochi mezzi a disposizione ed una incrollabile tenacia nel portare a termine queste lavorazioni meccaniche ben difficili dà realizzare devo dire che fai tanto, vedendo tè mi fà ricordare quando anch'io lavoravo in meccanica. Ci sono aziende con maestranze a detta loro delle più qualificate ed investimenti di miliardi nell'automazione di macchine a c.n.c che buttano via tutto, per la loro presunzione di credere di essere i migliori.

[@stevecarlisle3323]

I absolutely love the File Work 😂🇨🇦

[@honkie247]

First, you are wearing long sleeves while working on a lathe. Second, you are wearing a knit type material when working on a lathe. A short sleeve cotton shirt with buttons will tear before it pulls you in the lathe and makes you into blood pudding. Your idea of using a plate to mount the cylinder to is good, but the plate should be at least one inch thick to prevent cocking in the chuck. A top torque plate with washers under the heads of the bolts would have prevented marring a machined surface and distributed the clamping force. You bore within .001 and then hone to size WITH A HONE, not a glazebreaker with sandpaper wrapped around it. You have at least .002 taper from top (loose) to bottom (tight) and God knows how much runout. You ruined the cylinder to save $30.

[@Pete-ou4cq]

That piston is still way to tight in that bore and your technique is all wrong. And I bet you haven't even heard of a crosshatch.

[@Гладкоствол]

2 ошибки. 1) Надо было обработать торец кольца после снятия и установки. 2) Использовать индикатор рычажного типа.

[@oldschool1993]

Wow- way too tight- that thing will seize in 30 seconds.

[@nevinkuser9892]

You sir are a wild maniac with all that machining. Looks fun. I'm going to start with one of those hanging drills with a handheld tool for porting and polishing. Little by little we can get closer to having a nice shop.

[@frankromero4048]

Where theres a will. Theres a way... Two things : you're supposd to use torque plates on both sides of an aluminum cylinder... And your cross hatch is suppose be at a 45 degree angle...I agree with others piston is fit too tight...

[@mrrberger]

"Old Technique"? no, wrong technique. Even with the tools shown, it's a bad job full of wrong processes. The only takeaway is how to shoot a vid to trigger responses.

[@lhunt480]

Also no lubrication (suds) for the cutting, dreadful..

[@MrTiti]

can you do this to my Renault Twingo 1993 4cyl Engine?

[@philipjackson5818]

Good grief, never measured the piston before boring it out, then the honing OMG the cylinder will be bigger in the middle, besides it will lock up without the correct clearance or rattle like mad. Crap workmanship.

[@RS-vu3df]

Micrometer? Anyone? Correct clearance? Buy a book, it helps, learn to read first.

[@AndreyLaran]

4 года катается аналогично расточенный мопед без микрометров тоже- дымит с самого начала,но я не дымящих 2т моторов еще не видел) И масло жрет 20-30 гр на литр бензина ээх а точил бы с микрометром не жрал бы мало

[@dissident8758]

​@@AndreyLaran все правильно говоришь! А этот заморский спец пусть писю свою микрометром замерит😂

[@rndullrobinson3076]

I watched some kiwi sidecar loonies increase the piston size by center punching the entire surface of the piston and then lapping the piston until it would fit back in the cylinder. Stopped the slapping. It was some Bert Munroe shit they learned.

[@harolddalesr8365]

It was called , embloss of the piston shirt. Temporary fix

[@gungho6798]

What’s the tolerance between the piston and barrel ?

[@berntd]

OMG, that needs to be properly honed.

[@GeoffScott-e7d]

It amazes me how so called machinist don’t know what a 4 jaw chuck is , More accurate than a 3 Jaw

[@DàvidNewton-u7q]

Dead right, i have had apprentices over the years and have always made them get used to clocking in a four jaw chuck. At first they struggled but when they get used to it they realize its quite easy . Also used to make them screw cut rather than use taps and dies were possible . All essential skills for a machinist

[@hassanhombi849]

براغو.عليك.تحياتي. ممتاز.اخي.تبرك.الله❤😂

[@GuySupa]

beautifull work but........the piston will seize, should have between 0.04 and 0.06 clearance depending on the quality and diameter

[@munnujaiswal6594]

Kaha dukan hai

[@christophercollins3460]

Nice work so far just piston fitment is too tight of tolerance. Increase bore diameter another .010 and try again.

[@ВладВладыч-у9с]

Мужики расходимся, это видео создано для контента. Автор на этом видео заработал, а не на той "дичи" что на видео нам показал. После того как замерил диаметр цилиндра штангельциркулем можно было дальше не смотреть, про отсутствие теплового зазора и "хона" я вообще говорить не хочу.

[@seral777]

если подумать, осталось ему от хонинговать и в путь!

[@luigisportelli6004]

Troppo preciso l'alesaggio, col montaggio delle fasce elastiche nemmeno riuscirebbe a muoversi, più tolleranza tra pistone e cilindro👌👋

[@Man_With_Brain.]

They let it loose because when engine runs for few minutes the metal expands, and it works perfectly.

[@us4747]

Problema: Si dilata di più il cilindro o il pistone ? 🙂🤔

[@pavoldano3748]

Podľa toho čo som videl je to moc tesne .

[@paulbalsillie895]

Too tight, needs 2 thou per inch dia bore.

[@gerardswiers3373]

hoe verneuk je een cylinder?

[@jezztech]

I used to use a hone back in the day, even if it took all day, you only had one chance to get it right.

[@donnienicholson6062]

Magic holes Lt.Dan...just touch the ring with a drill bit.

[@Пятры38]

Молодец конечно ( если по русски прочитаешь?) Но как все пишут поршень должен даже без смазки не падать а опускаться без заеданий . А этот маленько нагреется и клинанет...Удачи и С Новым годом

[@AndreyLaran]

ратсочит еще раз делов то

[@seral777]

@@AndreyLaran так он под хон оставил место, поэтому и поршень в натяг...

[@thefreedomguyuk]

Yay, no need for rings on that oversize piston 😮

[@mercedesvan-doors34]

Little air cooled motor will need about a thou in the inch clearance.

[@MarkusK.-wx9ge]

Wieviel Einbauspiel sind das denn nun? Ich will ja kein Spielverderber sein aber bei dem luftgekühlten Zylinder könnte der Kolben schon bei der ersten Ausfahrt fressen. 😬

[@garfield2279]

Does he know what he’s doing? Using a file on the base of the cylinder? Using emery cloth instead of a honing tool? Having to push the piston through the barrel? Guaranteed until the end of the road, if he’s lucky.

[@SokolActor]

Can i make from 50cc to 150cc ?

[@dissident8758]

4-5 соток для зазора на нагрев и будет красота! Дохонингует и все будет классно!

[@ВладВладыч-у9с]

не будет красоты, это не дохонингуешь

[@dissident8758]

@@ВладВладыч-у9с очень даже будет!

[@ЕвгенийБ-д4с]

Ребята, боюсь многих огорчить, но такого ,,колхоза,, я ещё не видел. Это просто ,,атас,, . Кто хочет подробностей- пишите, не стесняйтесь!

[@bowtiekid329]

NO piston/cylinder wall clearance! Engine WILL seize! PLUS there is no crosshatch in the cylinder bore for ring seal! Idea was okay, but the small things that make the engine live were omitted!

[@СергейПотехин-п2о]

При правильной расточке хорошо смазаный поршень должен опускаться вниз под своим весом хотя бы секунду.

[@AndreyLaran]

особенно китаский из говносплава дует котрый неслабо от нагрева

[@КостяНежеловский]

He seems to be doing everything right, but not correctly. The piston stroke is checked through the cylinder skirt and not from the valve head. The piston is always checked through the cylinder skirt, but where is the thermal gap? And where is hom?

[@Mayze-Tokar]

Наждачная бумага и чугунный цилиндр, это фиаско, мастер видимо не в курсе что абразив с наждачной бумаги обсыпается а чугун очень сильно впитывает этот абразив и в итоге поршневая проедет совсем не долго

[@ReynanInoval]

Saan Po loc nyo boss

[@MotoGatosPerformance]

Being so tight the piston will stack within 10 minutes...

[@bibhisantanti9723]

Good method good idea

[@Gmmaika]

...und wie geht dies mit einem 4 Zylinder????

[@ВладимирТышкевич-ф3о]

Коменты вообще ураган побольше таких познавательных видео, как негадо делать😂😂

[@olevaiti4302]

My good, what a bungler. What a workshop and tools (maybe pre WW2).

[@annawogaliczko5381]

Takie toczenie to tylko w Bangladeszu lub Indiach.W Polsce jest honowanie.Prowizorka i..popękane bloki silnika....

[@michaelmorris2513]

Good job👍

[@АлеН-ч4у]

Я бы у тебя не растачивал, там нужен зазор, а не натяг При эксплуатации поршневую эту задерëт

[@ВладимирТышкевич-ф3о]

Не учи отца и баста😂😂

[@ludeboukema4111]

nice . here is power find

[@A.Mouse_1815]

O.M.G......Time to make the popcorn........

[@kurtler1]

Вот так технологии 😄

[@dineshkarthik3067]

Little bit tight

[@KabiSayyad]

4सांग चम्पियन के हेड मे ड्युअल सायलेंसर होल कैसे करोगे

[@alfabethev2.074]

Don't suppose there's a reason machine shop's don't do bodge jobs like this anymore..?

[@G31mR]

Glad this cylinder doesn't belong to me or one of my customers. It will probably seize withing a few minutes running.

[@mkrp4]

making the threaded holes in the ring should be done before facing

[@jerzyjaoza2732]

Masakra ta naprawa to nie ma prawa po zamontowaniu działać 👿☹️

[@gameplaystutosymashardcore7226]

Tolerance............. 0.2 milimeters for thermal expansion.

[@Totalrepairsolution]

Professionals Always Professionals keep it up❤

[@jorgericardoferreira3029]

ese piston esta muy ajustado en cuanto comience a calentarse se agarra al cilindro .

[@adeoo]

Good

[@nickmoore6727]

get a mic and internal telescopic gauge or borrow some for more accurate specs.

[@ChucKsor-dm4eq]

Chào bạn hay quá 👍🥰

[@pilotok8428]

5 minutes after engine start...Seize and jam brrrrrrrr

[@tuncaydemirkran6776]

super işçilik 25 yıl bende tornacılık yaptım tebrık ederım sızı

[@philnewcomers9170]

gGTP = generaly tight piston this is a willisism invented by Harrold Willis director of Velos ltd of Vitoria Rd Birmingham he was intermaying that you need agood ratteling fit then it might not sieze up .nice finish on the bore was the lap made of rubber ,wood or some sort of soft metal ttfn&ty

[@johnj4860]

Every time you take a piece out of a three jaw chuck it rarely goes back truly central next time because the chuck scrolls wear with use. My old machine teacher would have been horrified.

[@СашаПугач-я2х]

Я после расточки оставляю 0,1 а дальше делаю чугунный конусный притир и притираю каждый поршень по месту.

[@НиколайГрибов-щ2ш]

Притир даёт и правильную форму и чистоту...

[@KrugerdlyaMoisha-ce2xg]

Притир это правильно.

[@miguelr.c8757]

Muy mal rectificado,queda demasiado prieto,ese cilindro no dura ni 1 dia y esperen a ver si arranca la moto,por que no necesita ni secmentos de lo apretado que esta,en cuanto entre en calor si llega arrancar,se espande y gripa,saludos.

[@adrianaaraujo8634]

Nice

[@OsbornAgwii]

Please can we be friend i want to learn more from you

[@DakianSakar]

Esta mal el piston dilata cuando calienta .. tiene q entrar suelto

[@whathappened2230]

For real too tight.. Good job though with just a lathe.