[350MC]

Ok i know what overboreing is but what is honeing and hottanking???? what are they for what do they do?

and are they really worth the money to get done???

[poncho62]

hot tanking is cleaning your block in a corrosive hot water/acid solution. Gets all the crap off of it...

Honing is basically roughing up the cylinder wall surfaces, so the new rings will seat properly.........

Both are necessary when properly rebuilding a motor.

[crazy larry]

list of stuff to have the machine shop do.
1.hot tank the block after removing all the oil galley plugs.
2.bore and hone to a suitable finish.
3.check for need for decking or surfacing. only as needed. don't deck a block if you don't have to. Unless that's what you want.
4.install the cam bearings. (unless you have a cam bearing installer.)

ALL THE REST, YOU CAN DO AT HOME.
your gonna want to get some various sized brushes and some dawn dish soap, and some wd 40 and give it a good scrubbing when you get it home. you'll be surprised at what kind of crap comes out of a "clean" block.
before you take it in,make sure to note which oil galleys are plugged and how, so you can properly replace the plugs......
get it rinsed good, blow dry with compressed air if you can, then soak it with wd-40. let it air dry, then wrap it in plastic till your ready. then assemble away.

this assumes the block your taking in is in good running condition and only in need of an overbore. if it's a block your not familiar with it's history, get it magnafluxed and sonic checked.

[k2mooch]

Not being sarcastic, but what is magnafluxing? What does it do that an acid bath doesn't?




MoocH

[Bad Rat]

Originally posted by k2mooch
Not being sarcastic, but what is magnafluxing? What does it do that an acid bath doesn't?




MoocH

Magnafluxing ,,, they dust the block with a magnetic power, and use a magnet to find any cracks in the block when the power collects along a crack when the magnet passes near it, it reveals any minute cracks,,,,,,,, a acid bath is just that, the block is dipped in a vat containing a strong acid, possably hydrocloric acid, [not sure about that tho] that eats away at corosion and grease deposits to get them really clean, Bill

[crazy larry]

magnaflux is taking a fine metallic powder and lightly coating the block, head, crank, etc, with it as it(part being magnafluxed) is being supermagnetized. the magnetic energy will pull the powder into any cracks. even ones you can't see with your naked eye. not in any way related to an acid bath. magnafluxing is doen to determine the "fitness" of a part.
you might be thinking of jetwashing.???...

[Bad Rat]

duh!!!

[meanroy]

Magnafluxing, though somewhat expensive is great for Iron and Steel but for aluminum and magnesium there is an alternative technique. - Refered to as "Dye Check" it can also be used for Ferrous metals. It doesn't show internal faults like the best magnafluxing but is satisfactory for cracks which extend to the surface.

Here are a couple of links you might be interested in, this one:
Crack (LOL)

and this one from is a .PDF manual on crack repair which covers detection and repair both."GOODSON Tools and Supplies for Engine Builders"

Happy Fathers Day.

[crazy larry]

Bill, you took the words outta my keyhole.

[87442lover]

You can get away with not hot tanking a block. And sometimes it's better than letting the machine shop leave the block out in the open after they hot tank it!!!

Still can't believe they did that to my block, all surface rusted.

[Weimer]

Originally posted by 87442lover
You can get away with not hot tanking a block. And sometimes it's better than letting the machine shop leave the block out in the open after they hot tank it!!!

Still can't believe they did that to my block, all surface rusted.

Why didn't they spray it down with an oil? I think that I would take it back to them and make them clean it again....
Later,
WEIMER

[machine shop tom]

Originally posted by 87442lover
You can get away with not hot tanking a block. And sometimes it's better than letting the machine shop leave the block out in the open after they hot tank it!!!

Still can't believe they did that to my block, all surface rusted.

Generally, we won't do any machine work on a block that hasn't been at least chemically, if not thermally cleaned. The reasons are that it's too hard to find cracks, casting flaws (remember your head?), pits, etc. Also, not cleaning the block properly leaves crud in the oil galleries, etc. Not cleaning a block also is hard on tooling (gums up cutters and plugs up honing stones).

How long was the block at the shop before you picked it up? We don't oil down cleaned, unmachined blocks or heads unless we know it won't be picked up for a while. But then again there are guys who drop stuff off to be cleaned that we don't hear from for weeks or months.........


tom

[Bad Rat]

[QUOTE]Originally posted by crazy larry
Bill, you took the words outta my keyhole. [/Q
UOTE]
Sorry Larry!! at least we are on the same wave length, LOL only seconds apart,, Bill

[87442lover]

I believe this is someone elses thread, but my block sat out for a good 2 days or so. I figure it anit gonna hurt anything, but it was still the idea.

[machine shop tom]

Originally posted by 87442lover
I believe this is someone elses thread, but my block sat out for a good 2 days or so. I figure it anit gonna hurt anything, but it was still the idea.

As I said before, when someone gives questionable or just bad advice, I'm going to speak up. Not cleaning a block is just not a good idea. Only an inexperieced hack would give that kind of advice.

tom