4:03 Really interesting to see you using a cylinder as a straight edge! Never thought about doing that, would have saved me some $$ if I saw this yesterday! lol. Good stuff.
Funny how when I tell people machining a warped head doesn't take the warp out and it needs to be heat straightened. The names I get called and told how stupid I am by all the internet experts out there... I've only been doing this for 40 plus years now..... I only went to one of the best auto schools in the country. And I mean a real college, not a 9 month diploma mill.
Excellent video, I have a question hopefully you can help me, is when to use oversized head gasket after the cylinder head has been resurfaced, the machine shop has to indicate that?, Do you have to measure ?, or is it not necessary ?, the service manual does not say anything related to this, it only says about measuring piston protrusion to calculate for oversized head gasket, but not for resurfaced, thank you in advanced.
Brilliant video Justin. I have that exact problem 15 thou warp in middle,cam journals lifted. Can you tell me what is shim stock? What can I use as shims material wise? Is that brass? I have a rare head, I must do this. Thanks in advance.
You can buy shim stock at specified thicknesses. I am certain that you could find it online. I have also taken part feeler gauge sets and used the feeler gauges before.
Thanks for replying. I researched the shim stock on google ). Can I ask? If I had 20 thou warp in the centre would I be correct in thinking that I should place 10 thou shim thickness on each edge of the head? My problem is actually that the cam bores are line bored and as you mention in the video: this is crucial to align. My camshaft actually has a tight spot right in the centre where the warp is. I bought some thick flat steel plate 50 mm thick, very heavy. I will use the gasket as a pattern and will bolt down right. I'll let you know how I get on. Many thanks. )
I would actually put more shim on each end than the warpage is. I would probably put about 30 thousandths on each end, so that when you tighten the bolt in the middle, it warps the head in the opposite direction. Then, when it relaxes, hopefully it will be almost straight. Sometimes it takes two times to get it straight.
You can heat cast iron heads hotter than this. The problem if you go much hotter than 500-600 degrees on an aluminum head is that it expands so much that valve seats fall out.
I'm sure it would cost a bunch of money to ship the head, but I would be happy to at least look at the options with you. You can contact me and provide more info through our website: Catchawave.com
@@claytonstill2385 Yes aluminum can be annealed. At a fab shop I worked at we would anneal 6061T-6 before we would bend it. Up to 1/2' thick would bend flawlessly after annealing in out big press brake. If you tried it without annealing it would just shatter apart. An old timer there taught me how to anneal it with only an oxy/acet torch. Basically you coat the part with soot from only turning on the acetylene. Then run a normal flame and evenly heat the part just until the soot goes away. At that temp it is annealed!
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4:03 Really interesting to see you using a cylinder as a straight edge! Never thought about doing that, would have saved me some $$ if I saw this yesterday! lol. Good stuff.
Justin Miller Just curious how much does this warp repair coast?
Funny how when I tell people machining a warped head doesn't take the warp out and it needs to be heat straightened. The names I get called and told how stupid I am by all the internet experts out there... I've only been doing this for 40 plus years now..... I only went to one of the best auto schools in the country. And I mean a real college, not a 9 month diploma mill.
Excellent video, I have a question hopefully you can help me, is when to use oversized head gasket after the cylinder head has been resurfaced, the machine shop has to indicate that?, Do you have to measure ?, or is it not necessary ?, the service manual does not say anything related to this, it only says about measuring piston protrusion to calculate for oversized head gasket, but not for resurfaced, thank you in advanced.
This was a very simple warp to correct. What if its warped diagonally? How would that be corrected?
Thats a nice bench center you have in the beginning of the video .
Ive been wanting one for a while for m surface plate.
with this method is possible to fix the warping on the plane side? i mean to get it flat enough so there is no need to machine.Thank you
Brilliant video Justin. I have that exact problem 15 thou warp in middle,cam journals lifted. Can you tell me what is shim stock? What can I use as shims material wise? Is that brass? I have a rare head, I must do this. Thanks in advance.
You can buy shim stock at specified thicknesses. I am certain that you could find it online. I have also taken part feeler gauge sets and used the feeler gauges before.
Thanks for replying. I researched the shim stock on google ).
Can I ask? If I had 20 thou warp in the centre would I be correct in thinking that I should place 10 thou shim thickness on each edge of the head?
My problem is actually that the cam bores are line bored and as you mention in the video: this is crucial to align.
My camshaft actually has a tight spot right in the centre where the warp is.
I bought some thick flat steel plate 50 mm thick, very heavy. I will use the gasket as a pattern and will bolt down right.
I'll let you know how I get on.
Many thanks. )
I would actually put more shim on each end than the warpage is. I would probably put about 30 thousandths on each end, so that when you tighten the bolt in the middle, it warps the head in the opposite direction. Then, when it relaxes, hopefully it will be almost straight. Sometimes it takes two times to get it straight.
500 Celsius, and a 6 hour heating is the standard procedure for all cylinder heads or just those made from aluminum?
Cool video thanks for sharing!
You can heat cast iron heads hotter than this. The problem if you go much hotter than 500-600 degrees on an aluminum head is that it expands so much that valve seats fall out.
500 F, not 500 celcius, 500 F is equivalent to 260 degrees celcius
The warp on head is like a banana, what do u do?
I am keenly interested in having a head straightened in this fashion. Is this a service you offer? Can I contact you? Thank you in advance.
I'm sure it would cost a bunch of money to ship the head, but I would be happy to at least look at the options with you. You can contact me and provide more info through our website: Catchawave.com
Even then about an hour with a oxy acety torch, you get the same exact effect.
What plate did you set it on? Is it a manufactured thing that you bought or is it something you made?
The plate we use is made of two 3/4 inch steel plates welded together so that they cannot warp or flex.
Great idea!
Does this aneal the aluminum?
They make sure to use a low enough temperature to avoid annealing it. 450-500 should be safe and do the trick.
Aluminum isn't something that van be tempered as far as I know so that would suggest it cannot be annealed either.
@@claytonstill2385 Yes aluminum can be annealed. At a fab shop I worked at we would anneal 6061T-6 before we would bend it. Up to 1/2' thick would bend flawlessly after annealing in out big press brake. If you tried it without annealing it would just shatter apart. An old timer there taught me how to anneal it with only an oxy/acet torch. Basically you coat the part with soot from only turning on the acetylene. Then run a normal flame and evenly heat the part just until the soot goes away. At that temp it is annealed!
@@claytonstill2385 Some aluminum alloys can be heat treated. Some can't.
Oven is in degrees Fahrenheit not Celcius. 500 Celcius is 932 Fahrenheit.
Correct. It is in degrees Fahrenheit.
Can you do this with a conventional oven?
If your oven will get hot enough, it should work. I'm not sure if I would want my cylinder heads in the same oven as my my pizza, though!
Justin Miller Ain't nothing wrong with a little cylinder head residue tasting pizza.....
heh, made me giggle ! Would it anneal the aluminum, sir ?
I guess this a great reason to have a machine shop do a perfect job cleaning the head first.
Are those shims made out of tape measure?
No. Those are actually pieces of shim stock that we cut up.
Excelente
on pushrod engine does the warp on the valve side matter,can't you just machine the surface till it's flat?
yes--that is correct--as long as the valve seats and guides aren't distorted. Make sure to check them and machine them as necessary.
just howq it is donne, not ressurfacing it
pretty cleaver