How a Machine Shop Checks and Resurfaces a Cylinder Head
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- Опубліковано 13 січ 2021
- We Resurface the Cylinder Head to correct the warpage, test the valves for leaks, check the head for cracks and clean all gasket surfaces. We take off .008' on the head.
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Wish i had people like this work on my engine issue.
Gorgeous! Beautiful work!!
Great video! I'm having this done to my 97 Saturn SC2 right now.
Great video. There is a lot of prepping to this job of "milling". I didn't know that. My Honda Civic head (2005 LX 1.7L) is having this done to it right now.
Great to see a lady in the shop 😁
True dat.
Why?
Thanks for posting this enjoyable and informative video!
It's cool to see a knowledgeable and skilled young lady in a predominantly male field.
Tool & Die maker for over 45 years we had maybe one percent of women in trade most who started the apprentice program washed out pretty quickly.
Why?
Erm Honing is not to smoothen the surface of the cylinder walls but rather to create a cross -hatch pattern to retain the motor oil and to try prevent blow-by.
Agreed
Great informative post(I really loved the classic style workshop training manual info-graphics) , and great to see a lassie in the machine shop too.
Best wishes from Scotland.
Thank you!
I just fell in love!
good video. Great idea power washing it.
That was really cool! Never seen the actual process. I've got my Dodge 3.9l torn down which the heads need to be plained, block boarded to .30 and hopefully the crank will just need polishing and not have to get it grinded .10 of an inch.
Nice! Good luck with that bigtex trucker!
Fine head working
Really appreciate the video, this is a process I'm about to do myself and wasn't sure exactly what would happen at the machine shop.
The Delta Custom Tools pressure testing stand, good Canadian made tool👍. They make them right here in my area. Good vid🍻
Cool! What area is that? This video was shot in Edmonton.
@@zerbinauto Delta B.C. We're provincial neighbors😁🍻🇨🇦
Good mechanic lady! 👍
Machinist. Mechanicing is a different job with a different skill set.
If it was that warped, i would have definitely done a valve job, check the springs and changed the valve seal. It definitely got overheated.
Will a 18 inch/45.75cm long precision straight edge be long enough for most blocks/heads? Great info provided here, thanks
OLÁ. Não é necessário usar "lâmina de folga". Inclinando a "régua de Precisão" , inclinando e usando a quina, um lado luz e outro na sombra verás a planicidade que pode lhe indicar a qualidade do serviço da retificadora. Se usares a quina totalmente oposta poderás confirmar a deformação e até constatar se a "régua" não está deformada. Para não deformar a "régua" ela deve ser guardada dependurada. Um lembrete: Os blocos de alumínio podem deformar mais que os cabeçotes. O que realmente interessa é a soma das deformações. ABRAÇOS Roberto Udo Krapf
Why would you go through all that trouble and expense to remove and surface the head and not go ahead and machine the valves and seats ? Sure it cost some more $$ but the labor to get to that point and back is way more.
It seems that if it vacuum tested they thought there was no reason to reset the valves or check valve guides and install new valve guide seals 🤷♂️, but definitely was a good little video
Also I am compelled to point out that when you wash a head in a spray cabinet with the valves still in it you are leaving water in the valve guides it may not be much but can rust. Also if the head got hot enough to warp .008" then I'd be worried about this particular head dropping a valve seat in the future. That said I enjoyed this video thank you for sharing
Cool. 👍
Top 👏🏻👏🏻
Thats good machine shop probably not all do all just do little of it
Where is this machine shop? I am amazed by all the machines they have. Where in California can we find shops like that?
This one is in Edmonton Alberta Canada.
I work in machine shop in kuwait
the book says the max you can take of is 8 but ive had customers say just do it when they had .025 plus needed to be taken off and it was totally fine. yeah the compression might go up a little but they engine ran totally fine. you can safely take upwards of 15 all day long without any issue what so ever. and that goes for pretty much anything out there.
Thanks for the great advice. It would seem that they end up taking that much off down in Mexico here. They will rebuild the same engine several times before scrapping it. Valves must be so close to the Pistons by the third time. 😄
Are you sure about that? I just checked my head yesterday, and it had .009 in a couple of spots. The deck had .004 in a couple of spots. I really don't want to have to scrap my car.
@@ShyLeonheart ua-cam.com/video/28-FB3kyEDk/v-deo.html
The other option is a thicker head gasket if available for your engine. That can give you the extra thousands you need to not have valve piston contact. I’m not advocating to take off more then the spec says. It would have to be calculated precisely to ensure their is still clearance. All the best. I hope it works out.
once you remove greater than 008 your over head valves timing becomes off. you can still do it , you'll need to compensate since your changing the valve timing retarding them. adjustable timing gear, thicker head gasket etc
Different engines are different. Really depends on the geometry of what drives the cam(s). If the needed milling will affect the valve timing too much, then the head either needs material welded to it or it needs to go to the soda can factory. That amount is going to be different for every type of engine.
OLÁ novamente. Da forma como aplainas jamais conseguirás formar "cruzamento" que indica estar sua máquina em condições de uso ABRAÇOS
If decking blocks and heads and cutting valve seats was all you could find on youtube i’d be fine with that😀
Before any machining, what surface can you depend on as a reference point for placing the level?
A good straight edge for checking and the milling machine better be true or everything will be out.
The main “mother” reference is the valve angle. For this head, it would be the cam bore. This machine shop (I presume) didn’t check the cam bores because he didn’t ask them to. IMO, it’s a good idea for a machinist to ask these days, because a lot of diy’ers don’t think about that for overhead cam cylinder heads. On some heads, there are actually machined pads from the factory for a machinist to use as reference during overhaul work.
What is the maximum cuts depth that we can shave of the engine head ?
.228mm or .009” maximum for this head. This number will vary from manufactures and based on head size. Best to check a service manual for your car.
ok, the head warped .008 or so, aren't the cam bushings out by that much too? What about them??
i have worked on aluminum overhead cam heads, and we had to re align the bushings as well!
Is the cleaning a common thing for resurfacing a cylinder head? Did they check to see if the head was hard enough for a resurface?
Cleaning should be part of it. Especially after to remove any left over metal particles.
When was this video taken? I used to work here.
Really? Cool! I think it was 2015 or 2016.
@@zerbinauto Yessir. Was the main cylinder head guy. Good ole Best Engines
I use a different type of Cylinder head resurfacing machine
If the head was warped that much did you check the camshaft journal alignment? When the head warps up in the center so does the camshaft journals.
I was thinking the same. They bend the same above and underneath and adopt the shape of a banana. I learned it the hard way.
Rarely. Because more structure exists up top with the valve cover rails, casting trusses etc. they often stay straight. They have to have been severely overheated (or cold water poured into an overheated engine roadside) in order for the cam tunnel to be out of line.
Why not clean the carbon off the valves?
He's following her around like a little chickadee.
How much should this cost ? I want to take my cylinder head to shop I want to have an idea before I go .
Prices will vary by region. I Believe I paid around $200 Canadian for this at the time. I had a more extensive service done to one in Baja Mexico last week and it was about $65USD
@@zerbinauto wow
May I know what is the cost roughly for this head resurface job
What car ?
Avg Car 1200-2000
Foreign car up to 3500 more or less
Maybe $150?
Have her check the threads in your block. They may need helicoils.
Why didn't they measure the top? Overhead cam heads needs to be measured on top as well. Make sure the cam journals are still in line. When the bottom warps the top usually follows
Good point. Maybe the top is less likely to warp…..
What a woman 😍🥰😍❤
How much did all that cost?
I think it was around $230 Canadian at the time.
Can't see anything while facing it... Big Baby
Problem is your cam is now running .008 out of line so it will have to run bent. SOMETHING will give out. This process is not for overhead cam engines. For those you have to straighten the head first, not mill it bent.
Oops.
water level? Are you installing a sink? And if if the head do not want to stay in level what do you do? Force it with the clamps? OMG.
you gotta do what ya gatta do. lol
@@zerbinauto 🙄
Where the valve guides checked.
The valve guides were not checked in this. That would be an extra service a shop could do if requested. I replaced the valve seals on this head. If valves haven’t bent the guides are usually fine. 👍
Hi. Please explain how 8thou of an inch is a larger measurement than 1thou of an inch. I would love to see the math.
Hey. Maybe it’s the wording that’s confusing. If i have one apple and you have 8 apples. Who has more? 8 is a bigger number then 1. It’s a decimal. .001” to .008”. The more thousands you have the closer you are to 1”. And that’s a bigger number. 👍
@@zerbinauto Thanks for the explanation. When expressed as a decimal its clear to see. The wording is the issue though. This is whats been compounding me. I look at it like: a thousandth of an inch = 1 inch divided by 1000 = Larger measurement vs 8 thousandth of an inch = 1 inch divided by 8 thousand = smaller measurement.
@@moerskop21 No problem. It’s just flipping it around. A thousand of an inch is .001 of and inch. 1/1000= .001
8/1000= .008. One inch is the total so we are talking about how many pieces of the inch we have. Maybe I’m just getting more confusing. Lol.
So if it’s above 8k, wdym we can’t resurface? Like is it destroyed or can’t fix it?
The problem is when the tolerance gets too tight then the valves could contact the Pistons when you really step on the gas. They do make cylinder head spacers so that you can push it even farther something to look into for your particular engine. With a spacer, even if yours is over the factory spec, you could still install the head.
@@zerbinauto thks sm
I thought you had to take out the valves and clean them too
If they leak in the test then yes for sure. You can ask for this service at the machine shop. It may be included in their head service or you might have to pay extra.
🤗👑 you 🙋🎭 Nice to
Gentlemen,,,
If you ever come across a woman who can do what we saw in the video.
You get on your knee, buy the most expensive ring you can, make her yours, and thank God every day for the rest of your lives.
😂
Girl grease monkeys are in short supply.
Genial como trabaja la chica si no tienes novio me apunto cono pretendiente un abrazo
why are you using inch measurements ? tell me in mm
Because we are so confused in Canada! We play both sides. .009”= 0.2286mm
.008”= 0.2032
dude that girl is smooooook in !!!!!!!!!!!!!!
Who's the girl?
Surfacing the head doesn't take the warp out. What it does then is create heavy and thin areas which cause hot spots to develop and crate even worse warping and mismatched combustion chamber sizes which creates imbalance and can even cause a car to fail emissions in some states. Being that the remainder of the head is still warped, it places stress on the valve train and cam(s) IF the head is an overhead cam. On overhead cams the valve timing will not only be off but the journals will wear in an odd fashion across the length of the cam effectively ruining the head all together. Don't listen to this guy. You need to have the heads heat straightened. Once that's done a very light cleanup pass can be done if needed to take care of any dinged up areas but generally the heat straightening is all you need.
Uh…what is this fancy new method you speak of? People successfully machine heads all over the world.
@@zerbinauto This isnt new. And I dont care what people do all over the world. I was very clear what I said and the issues it creates. If you dont get it, you dont need to be in the business.
@@opieshomeshop Machine shops do this?
Nonsense.
It's metallurgy, it releases stresses that thermal change brings on, and I believe it releases carbon or some thing. It's the same sort of principal as quenching copper.