It'll be fine. The guy next door makes the valves using the same equipment so tolerances will match.

Now you can all appreciate how hard your grandfathers father had to work to put food on the table. Great job guys.

That valve cutter had more runout then Usain bolt

I reckon these blokes do a great job considering their facility. If you really want to do something then no matter what the situation is surrounding you there's a fix for everything. I've seem and done head repairs before but this definitely takes the cake. The bloke on the torch is brilliant. Who can say that they have filled a gaping great hole in a casting with an oxy torch. If anything went on like that here in Australia the health and safety joker's would be having pink fit's. Just imagine stubbing a toe just wearing those scuff thingy's. Holy shit, my eye's watered thinking about it. I think your doing a great job fella's,

Valve seat = +/- 2mm. That's gold!

Kudos to these guys, they do a whole lot with very little. Reminds of a fella I saw when I was deployed in Baghdad, he was milling aluminum heads with a belt sander set up on urethane skateboard wheels that rode on tracks. Necessity is truly the mother of invention.

I don’t care what anyone says about these guys. They use the tools they have. They don’t live in a disposable economy. If only we in the west understood the true blessing of skills these gentlemen possess. It may not be to exact tolerances or specs. I bet that head stays on the road 10 years before they need another head repair. Simply amazing what ingenuity and fortitude these humans possess. If these guys were given opportunity tools and resources I bet they would be world leaders in innovation! Take note people this is what men look like, no excuses no safety gear no excuses just results!!!

I love the precision measuring instruments these guys use. The electronics repair shop next door has a counter/timer calibrated in hours if you want precision, but if you want standard measurement, they use a calendar.

The amount of wobble in that locating rod was crazy. Its meant to slide in the valve guide and hold that cutter so as to not let it walk while cutting the valve seat. The whole crack being repaired required it to create a solid area that use to be hollow to allow for coolant or oil passages. The rocker studs that were turned red hot are not just noodles. But I was entertained and that is all that matters.

Automotive industry is based on extremely precise engineering. Believe me I'm no engineer but the way these guys are "mending" the cylinder heads is mind blowing.I live here in Pakistan and these guys repair the engines which run all the buses which we ride and our safety depends on the skills and the shabby equipment of these machinist and welders.I wonder if they have had any education in automotive engineering because these skills are passed on from one generation to next without any textbook knowledge

I am a poor farmer I have a 1982 f150 4x4 4.9l 300 straight six. Had a crack in the head. I ground it down welded it back up hand lapped the vavles and went to machine shop had it flattened and pressure checked. My buddy charged me 60.00 to do it for me at the machine shop. I have been driving with that head since 1994! Runs strong never had any issues since!

I've only seen such talented welders and mechanics in one place. It's called The shop. An old Harley shop in Ventura. My 1952 panhead had a crack in the cam case everyone else told me made it garbage. They repaired it with the same kind of skills and that old panhead still runs fine. Thank you huggy

it's the most eco-friendly grill I've ever seen in my life, Greta is happy... :)

“Yes, we offer lifetime warranty” but it will be very difficult to find us after this life 😂😂

Obviously these guys know what they’re doing. Imagine how good their work would be if they had a decent shop to work in with modern tools.

Love it...necessity is the mother of invention...it may look madness to most but when you need to repair an expensive item you cannot afford or wait weeks/months you'll be surprised at what you can achieve...I've worked on heavy earthmoving equipment in a few countries of the world where there is no chance of getting replacement parts you just have to make and mend...👍👍

Good news! We fixed the cracks. Also bad news. We destroyed the entire head in the process.

I remember repairing a cracked Land-rover cylinder head using self tapping screws. Drill a hole just past the crack, screw in a self tapper and cut flush. Drill the next hole half into the first (along the crack) and fit another screw. Rinse and repeat until past the crack. Face the head and refit. It lasted for at least 10 years before we lost track of it. Later on I came across a commercial repair kit which used a similar method, I think it was called Metalock Metal Stitching

The amount of times he used that compass to check the tolerances, it was almost like he was praying for metal to grow back to make it a perfect circle again. lol

I worked with this former English Air Force Technician who had incredible welding skill knowledge and seen him repair anything placed in front of him, stuff like this, amazing workmanship.

5 minutes into the video I keep pausing it trying to wrap my head around HOW are they going to pull this off 😂 these videos are just amazing, the skill those guys have. I just love this channel. In Europe a repair shop would never touch this. They would tell the customer it cant be repaired. You have to throw it away and buy a new part.

These guys are good for a 100,000 mile warranty, no problems.

Very talented mechanics ! With minimum tools tey made a great work, RESPECT !

I watched a mechanic weld an engine cylinder with a torch and coat hanger. He preheated it on a bbq pit. Put the engine in his wrecker and used it for years. That was in the mid 80’s. I ran into his son and he said it ran like a champ until 99-00.

Yes, used to do this work 40 years ago in a Kansas City weld shop. We used natural gas, fire bricks, asbestos and later, kao wool insulation. That is straight cast iron rod with probably ferro flux. I'm sure there are still shops around the country here in the US that do this type of work.

i did a bently head like this years ago , had frost damage used a section out a cast bathtub ,if you coat the gasket face with a mix of chalk powder and oil , graphite and oil or the white developer spray for dye pen kits it does not scale preheat is around 900c dull red and must be covered up and cooled as slow as possible i followed instruction from an old 1920s gas welding manual and the job was a total sucess and saved £6k i used a no 25 nozzle and sif square rods 6mm and sifcast flux still available from sif it can be arc welded too at dull red with 7018 and has no stress when cooled slow i welded some very fragile exhaust manifolds like this a lot better than the snake oil rods its the weld shrinking fast due to the preheat being insuffient that causes cracking

I love these charcoal fires in Asian repair movies. Gives lots of atmosphere. And talking about precision: you can always try better in your next life, or in the next life of the chap who relied on your repair.

Amazing work. Thanks for sharing 🙏

I am surprised they didn’t put it on a lathe

18:05 Two men can lift the head. 21:29 Two men can carry the head and lift it onto a mill. 26:09 Two men lift it off the mill to move it to the fly cutting mill. 26:50 Two men cannot lift the head. I think the dude in the sandals with the hoist is the brightest bulb in the bunch. He'll still have a strong back when he's 40 even if he doesn't have any toes left.

That is a-maz-ing. It isn't something from nothing, but it is a terrific result from a fantastic effort in very challenging circumstances.

It amazes me how much some people are capable of doing with so little. Those bent bits killed me, this is too good. These people need a site where donations can be sent so they can atleast get some new bits.

25:40 Remember kids, if you cut first and measure second you can always round the number off to being within tolerances you never check.

Gosh you guys are adventurous and clever. Thanks for posting, very interesting.

Amazing what they can do with the tools available. I would love to see the compression numbers as there is no way they are not losing compression through those values..... Great video, thank you!

ça c'est de la mécanique ! bravo et grand respect

That machine drill had some serious wobble but i love how they improvise 🤣

Damn good work for what they have. Incredible determination.

Awesome skills from start to finish, sure be nice to see the final assembly

Amazing - Well done - Great repair !

Always great to see that they always put safety first.

They do the best with what they have. Amazing work !!!! Hope the motor runs more than few hours. Still, very impressive..👍👍👍

I wish I had hard workers like that at my shop . At my shop people are more concerned about their cell phones than the work they are there to perform. Sad generation we live in .

I saw the same kind of work done in Korea when I worked there in the 70s. It is amazing what these folks can do!

Submarines are welded in a similar way . Outer hull is heated until the welding introduces no stress. Then a patch can be welded in without introducing stress arias and make the whole thing equally strong

I would like to see the rest of the repair. The valve guides and valve seats, because the valve guides looked way oversize and out of round. Maybe it goes to a machine shop next. Cheers.

I gotta say that’s a fine job you guys did there with skills like this I’m confident you could repair anything… Well done 👏

30/12 22 They have a Plough Grinder - ideally need to aquire a Jig Borer or Jig Grinder, or Universal Milling M/C. Blocked cooling passages ensures continued repair work. Were those smaller blocks used to surround the furnace ready to offer an exchange system ? What other services do they offer ?

Astounding, now assemble the engine , show us the amazing repair in action.

I wouldn't have thought of simply leaving the iron in the charcoal until it burns out; the ash would be a good insulator to ensure the iron cools slowly. 'Very cool watching people make repairs like this under adverse conditions (tired tooling, etc). I suspect that Gru would approve...

I fact yes I've seen a similar job on an aluminium head of a Sunbeam Stiletto in the eighties in the Netherlands, the head turned out fine, good job ! 👍😀

The big shot gets a table and chair ! Very poor conditions these workers must endure... Much respect!!

These guys are highly skilled. They make up for a lack of precision equipment with years of experience and thorough knowledge of their craft.

Amazing work, wow, what a fabulous skill these guys have got, who would have thought that such a wonderful repair could be carried out and probably save the Cat owners a whole mint of money, or even having to scrap the engine. So very well done guys, !

the more I see of these Indian guys and some of these restoration videos the more respect I have for the way they do things.

We did this in Hollywood, Florida in the 1970's. I was the helper for the welder. I ground out the cracks, pulled all the valve seats and set it up in a firebrick oven with asbestos covering the top. We used a big propane torch to heat up the head and when it was ready Lucky would go in with an oxy/acetylene torch, a cast iron rod and flux and weld it up. After cool down it would take me several hours just sandblasting the scale off in preparation for machining. I don't know if anybody still does that in the states though.

This was the function of a place in Adelaide, South Australia that I worked at about 60 years ago. We would repair heads and blocks from any thing from Vesper Scooters to Train engines. It was a proper workshop, with all the right equipment.

these people amaze me with the repairs they make and the pieces they make from scratch,very clever folks indeed

Heat treatment is paramount to a cast iron repair. Very good workmanship. 👍

Beautiful work! I'm impressed.

I'm no machinist, but the runout on that machine looked a bit alarming. Amazing what these guys do, though, with the tools they have.

Would like to see the next video when it runs??

Congratulations you are the real engineers you alie the experience with the fundamentals of metallurgy the previous eat up reveals you know what you are doing

Amazing skills. Just imagine how much more they can do if they had work benches and even shoes.

Is it my eye but they filled in the cooling jacket on the repair ? also the pilot bit was a bit out of round ....what are the tolerances ?+ or - a inch lol!!

Strangely enough I have seen head repairs done similar to this with different heat sources not coal and it can be done successfully I used to know a guy that could weld up cracked aluminum cylinder heads back when they were first coming out with those and having so many problems. it was a long slow heating process then do the repair and then wrap it up in insulated blankets and let it cool for about two days are used to think that many blankets would be overkill but you would end up with a cylinder head wrapped in about 2 foot of insulation to make it cool slowly The guy had a very high rate of success doing that

Amazing people an very talented at enganuity an a different way of thinking. Simply Amazing to watch.

Think that pillar drill could use some recalibration but great to watch, these guys obviously know their stuff 👍👏.

This is also how we repair Jet engine blades in the Bayou.......Works great!

You know this shop is safety conscience because they wear closed toe sneakers vs sandals … but seriously amazing that any of this works and the ingenuity to rework stuff when that is what they have to work with…probably no supply chain interruptions ….

necessity is the mother of all invention. amazing what these guys can do with so little...

como todo buen video, arranca con una buena amoladora angular tirando chispas! bravo ❤

Could you imagine if they had access to newer equipment and steel toe shoes.

Особенно понравился мангал из головок!!!

Amazing what they are doing with that equipment and cutters.

It never ceases to amaze me the ingenuity from some countries.

That's some fine machine work going on there, that valve cutter has more wobble than my Dewalt!!

Damn! I waited until the end but they didn't show the fitment of the oval shaped valves :)

These guys are very clever and the work they do is outstanding. Repairs they are doing today are clever and believe it or not such types of repairs were accomplished in most garages and workshops around the world as a matter of having to because of the massive cost if done professionally and of course in the West professional repair shops capable of doing "Guaranteed" work were few and far between prior to the 50's and 60's, and of course if your repair failed you either got sued or run through the courts until it broke the bank. Here these guys are not threatened by Insurance companies or threatened by Court action and I would guess that these repairs are not long- term and there are rather regular re-does which I guess they happily do.

These guys are some kind of talent - Great skills.

Yes, this is a salvage process to try to save an expensive head that is no longer in production such as these D343 heads. I was a Cat factory Service Rep in the San Diego area years ago and fought with a local repair welding shop there who was spray welding heads and blocks and claimed to have a "like new" product when done! We never allowed the dealer to use those repaired heads on a warrantable failure as we had to stand on their quality. Oftentimes the welded product did appear to be as good as a new product but paint can hide a lot of variations!! Buyer beware!!

Just a note to the Bob Villas out there that think Muggyweld, Stainless or NiRod with no proper prepheat is the way to weld Cast Iron. - What you just saw is the ONLY way to WELD cast iron. If you look you will find it produced an undetectable repair. - Actually re-cast the iron in the broken places. Any other way is just to camouflage the damage. - Oxy Fuel with real cast iron rod is the only way.,,,,and other then a programmable oven charcoal is the only way to pre and post heat the part. - Just cover it in burning charcoal when you are done and let the fire go out over night (or more) and leave it there until it's cool enough to pick up in your bare hands. On the other hand,,,,in the US to make that repair the welding alone would cost more then a complete new loaded head, if you could still find someone with the skill to do it,,,,But just because we would scrap it over here doesn't mean they didn't properly repair it over there.

Those guys are great! Their head jobs are the best!

For sure that added material is not hollow anymore as it was before for cooling reasons... Very high precision tools and labor...

Awesome video Great work !

Cool video! I was hoping to see it running!

Checking the tolerances with a compass! 🤣

usually a friable ceramic plug is installed in the valve guide unless it's small then welded around and drilled. yes the guides are used to help set up the drill alignment..but the drill press is about 4 times larger and heavier...and not dependent on the guide. heat treatment and materials and techniques are universal...but the coking fire is unique. a number of things can be done with the drill press, then it has to be refined with a heavier more precise articulated mill, and then re-ported and gasket faces ground. process is rough tolerance to finer each step.

Good on these guy's , now the valves will get bedded in with a twirly rubber sucker cup. they do things the old way and it works, watching these guys has made me realise I worry too much working on my old four cylinder VW van. from now on I'm going to get my drill press out and my files and sandpaper and concentrate on doing, and less on worrying about a few millimetre.

Probably mentioned and common sense to most, this might not be the ideal repair, but when considering the cost of repair versus the cost of replacing a head, there’s no doubt that this approach will win. Also, the lack of a full blown tool shop equipment keeps the cost low. Either way the repair will get the trickiest back on the road with a small bill instead of a mortgage

Congratulations, you just made a giant paperweight.

It looks great. My only two questions are 1) it looks like they filled the water jacket passages. That might make this crack again quickly, and 2) I didn’t see them drill the new bolt hole they filled!

These guys are top tier- you can tell by the way they have actual shoes.

this is unbelievable......😇 they are doing a great job

Il faut encore repercer le trou fileté sur un des cylindres, mais beau travail !

I'm not really sure this head would last very much in use.... But I might be wrong 🤷 Angle grinder use on a head is weird. Valve seat cutting with that much play in the drill shaft is insane. Maybe the valve guid centers it 😄 Do they measure valve seat depth? Do these heads have seat inserts? Some heads so have coolant passages around valve seats and/or spark plug threading. It's possible to warp the head by heating it that much, that long. It would have to be pressed straight. But in the end I doubt they would do all this work for nothing.

Awesome work guys!!!!👍

After the apocalypse , everyone will be looking for guys like THIS to help rebuild .

В центре головки (3 или 4 цилиндр) забыли просверлить и нарезать резьбу под свечу, а так норм. Если что то на 5-ти цилиндрах работать будет

32:22 looks good except I'm just a little wary of the 3rd from the bottom ports