Now that, folks, is how you do an instructional video. Simple and straightforward explanation of what's being done, why it's being done and how it's being done with a clear easy to see video. Nice work!
We used spray powder to do the cast repair on heads and bocks, once all cracks are ground 1/4” wide, and head goes in furnace. It’s an art. We used to repair diesel heads for half cost of new head
Hey folks. I perform nondestructive testing for a living. It’s actually called a Magnetic Particle Exam, not magnafluxing. Magnaflux is the name of a NDT material and equipment company. One thing important to stress is the process used during this video... two directions, as was used is super critical. Cracks can propagate in any orientation, and will only be detected in an orientation perpendicular, or semi-perpendicular (up to 45deg) to the direction of the lines of flux. I have viewed many videos that only use one direction for the field, and it’s just plain wrong. This was a good overview video of the process... great job, as always!
Hey Sir. I have a question, can you help me out? I have a 170 years old antique black powder gun. I want to check the cylinder of invisible cracks before shooting again with the gun. Which method of nondestructive testing would be the best for me? Magnetic Particle Exam, Dye Penetrant...?
Technically it is called Magnetic Particle Inspection or MPI. Magnaflux is a trade name. Is your yoke AC or DC and is it homemade and how much does it weigh? I’ve got somewhere above 22,000 hours doing this process and can readily recommend it. For all you out there, AC only shows surface cracks. DC can show sub surface cracks somewhat below the surface with softer metals showing deeper cracks.
I wanted to ask if there's a procedure machinists use to check for cracks on internal passageways. i.e. water jackets, or oil galleries ? Thanks again for all the useful information.
I'm wondering if the magnetic powder is simply toner for a printer. That toner is magnetic powder that sticks to the paper. I'm looking to just buy an electromagnet and the powder... if not toner refill.
never seen dry powder always seen some type of water solution with the powder in it. this was a good video to watch. thank you. if you had an electromagnet large enough could you do the entire head/block surface?
@@kevinbenet193 yes, but we also use a wet mag system. Same principle but instead of "sprinkling" a dry particle on the casting while holding a small yoke, we have a solution with the particles mixed in it. A crank or head will be elevated on uprights so a hoop style yoke can pass all around while appling the solution. For a block, we wrap a coil around it. The wet mag is much easier to use on a crank and more accurate on a block.
@@kevinbenet193 I remanufacture pulp mill equipent and we mag everything with dry particle. Our stuff is quite large though. A #900 feeder housing is 30,000 pounds and the rotor for it is 18,000 pounds. So wet mag would not work quite so well for us. But in the engine building world, it is a wonderfull way to NDT castings. I have been in a lot of engine shops and the dry mag is by far the most common.
Why does some of the TH-cam video like this one have no volume or audio? Others i look at does but a lot of times no audio on some. Wonder what is wrong me or them?
Yep , it can be cheaper to buy another head , than repair it . If it's a rare head , then it may be less expensive to repair and easier than finding another matching head .
Do you think the crack was the cause of someone installing the harden valve seats wrong ? Whats it cost to install harden valve seats on a pair of sbc 3927186 heads with the valves still in ? do they magnaflux them before an after work like that ?
comes through that head bolt so they probably impact wrenched the bolt and the stress traveled to the point of least resistance which would be the valve port opening.
the crack is causing a change in the magnetic field which grabs the particles differently and therefore you can see the crack because you can see the metal dust sitting in that crack differently than the surfaces around it.
The Yoke or Electro Magnet creates a magnetic field between the legs of the Yoke, while in contact with the base metal, Once you dust the part with the powder, which is kinda like steel fibers. The Magnetic field causes the fibres to stand up in the crack.
A crack in a piece of iron will break the continuous magnetic field into two smaller fields touching at their poles. Magnetic forces are highest at the poles, so the powder sticks there and easily shows the crack.
Kool tool ..butvto be honest, while that crack may have not been visible by naked eye, inspecting block with a magnify glass or even simply my phone lens would have made crack visible... I thought magnaflux was a more indepth probing method 🤔
Excellent video thank you. and can you tell me where I can buy a magnetic like yours ?. and I have heard you say you can a motor or parts from a core yard , where can you find these places ? I can't seem to find these places. thank you. I hope you will answer your older videos. they are still great.
Now that, folks, is how you do an instructional video. Simple and straightforward explanation of what's being done, why it's being done and how it's being done with a clear easy to see video. Nice work!
We used spray powder to do the cast repair on heads and bocks, once all cracks are ground 1/4” wide, and head goes in furnace. It’s an art. We used to repair diesel heads for half cost of new head
Hey folks. I perform nondestructive testing for a living. It’s actually called a Magnetic Particle Exam, not magnafluxing. Magnaflux is the name of a NDT material and equipment company. One thing important to stress is the process used during this video... two directions, as was used is super critical. Cracks can propagate in any orientation, and will only be detected in an orientation perpendicular, or semi-perpendicular (up to 45deg) to the direction of the lines of flux. I have viewed many videos that only use one direction for the field, and it’s just plain wrong. This was a good overview video of the process... great job, as always!
Well put!
Hey Sir. I have a question, can you help me out? I have a 170 years old antique black powder gun. I want to check the cylinder of invisible cracks before shooting again with the gun. Which method of nondestructive testing would be the best for me? Magnetic Particle Exam, Dye Penetrant...?
Revisiting your videos as usual - Such great Content - I always get more info the second and 3rd time watching
Awesome, I was looking for an example of what a crack looked like with magnaflux
Thanks for this video I was curious how it worked
Man!!! thank you for showing us the way!
Thank you for a straight forward useful video!
Where do you buy this equipment?
Technically it is called Magnetic Particle Inspection or MPI. Magnaflux is a trade name. Is your yoke AC or DC and is it homemade and how much does it weigh? I’ve got somewhere above 22,000 hours doing this process and can readily recommend it. For all you out there, AC only shows surface cracks. DC can show sub surface cracks somewhat below the surface with softer metals showing deeper cracks.
I wanted to ask if there's a procedure machinists use to check for cracks on internal passageways. i.e. water jackets, or oil galleries ? Thanks again for all the useful information.
Most generally you look
@@jameshester1450 you know most passages are blind
Excellent video thank you for posting
Great video, learned a lot! Thank you!
Great video appreciate it sir!
Nice thanks I'm guna do this with my vortec heads before I put screw in studs
I'm wondering if the magnetic powder is simply toner for a printer. That toner is magnetic powder that sticks to the paper. I'm looking to just buy an electromagnet and the powder... if not toner refill.
Heard your Storm Vulcan mill surfacing in the background. Recognize that sound anywhere.
never seen dry powder always seen some type of water solution with the powder in it. this was a good video to watch. thank you. if you had an electromagnet large enough could you do the entire head/block surface?
Not intending on an argument, But what he is doing Is Mag-Particle Testing. Magna Flux uses a chemical solution along with a Black light
@@kevinbenet193 yes, but we also use a wet mag system. Same principle but instead of "sprinkling" a dry particle on the casting while holding a small yoke, we have a solution with the particles mixed in it. A crank or head will be elevated on uprights so a hoop style yoke can pass all around while appling the solution. For a block, we wrap a coil around it. The wet mag is much easier to use on a crank and more accurate on a block.
@@whiplashmachine Makes sense
We used to do a lot of Pivot Sharts and Trunnions for the Coalmine Industry
@@kevinbenet193 I remanufacture pulp mill equipent and we mag everything with dry particle. Our stuff is quite large though. A #900 feeder housing is 30,000 pounds and the rotor for it is 18,000 pounds. So wet mag would not work quite so well for us. But in the engine building world, it is a wonderfull way to NDT castings. I have been in a lot of engine shops and the dry mag is by far the most common.
Makes perfect sense to me
Why does some of the TH-cam video like this one have no volume or audio? Others i look at does but a lot of times no audio on some. Wonder what is wrong me or them?
Yep , it can be cheaper to buy another head , than repair it . If it's a rare head , then it may be less expensive to repair and easier than finding another matching head .
Nice job
Is that a 191 head? Swirl port and pressed in hardened valve seats make me think it's a 191
how often you find cracks in cylinder head?
damn I wish I had a garage like yours! lol
Do you think the crack was the cause of someone installing the harden valve seats wrong ? Whats it cost to install harden valve seats on a pair of sbc 3927186 heads with the valves still in ? do they magnaflux them before an after work like that ?
comes through that head bolt so they probably impact wrenched the bolt and the stress traveled to the point of least resistance which would be the valve port opening.
This is just where they like to crack. Especially these tbi 191/193 castings. I have failed more than double what passed.
@@zippythechicken Installing head bolts with an impact should be punishable by fine, imprisonment, or both.
How much does it cost for something like this?
cesiumion at a machine shop near me they charge around 30 bucks for each head and 45 for a block
That's amazing
very interesting, but I am not sure I understand just what is happening with the magnet and metal filings...
the crack is causing a change in the magnetic field which grabs the particles differently and therefore you can see the crack because you can see the metal dust sitting in that crack differently than the surfaces around it.
The Yoke or Electro Magnet creates a magnetic field between the legs of the Yoke, while in contact with the base metal, Once you dust the part with the powder, which is kinda like steel fibers. The Magnetic field causes the fibres to stand up in the crack.
A crack in a piece of iron will break the continuous magnetic field into two smaller fields touching at their poles. Magnetic forces are highest at the poles, so the powder sticks there and easily shows the crack.
Kool tool ..butvto be honest, while that crack may have not been visible by naked eye, inspecting block with a magnify glass or even simply my phone lens would have made crack visible... I thought magnaflux was a more indepth probing method 🤔
you won't see most cracks with out it the magnaifying glass or phone lens thing won't wor that's just silly
GM did not install hard seats that is a 624 casting
they flame hardened the ex-seat area on every casting after 1972 also they did install hard seat inserts on many of the heavy-duty applications
It's known as Magnetic Particle Inspection. Another is dye penetrant
When I grow up I want to be just like that
awesome
Thanks
Excellent video thank you. and can you tell me where I can buy a magnetic like yours ?. and I have heard you say you can a motor or parts from a core yard , where can you find these places ? I can't seem to find these places. thank you. I hope you will answer your older videos. they are still great.
craigslist works also goodson sells mag kits
thank you for the reply.
dry particle inspection.
Thank you!