Do you use Roloc discs to clean gasket surfaces?

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correct me if im wrong but it looks the block wasn't decked enough. The marks don't look like a cookie disc. And why would you cookie around the cylinder and not around the hole gasket surface.

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You'd have to ask the owner for the answer to that. He did tell me he used a cookie to clean the deck and that's exactly what it looks like. I see this kind of thing all the time. Had he not "cookied" it, we could have taken .002 off the deck and all would've been clean and straight. Now he'll be doing some chamber work on the heads instead.
In the end it's no big deal to me, the machine's doing the work, but I thought I'd share this little tidbit for anyone thinking of doing something similar.

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Is this a block that was done at your shop originally, and having a freshen up..??..or is this a block that was brought to you for a new build?? I'm suspecting it is a new build. The deck being off is to be expected. The cleaning with the scuffy pad(if used correctly) would not cause that much damage.

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Thanks for sharing. Do you think it would have lived with just .006" off? Is .002" enough to worry about one way or another?
Can you take .008 off the top of the pistons if you can't do it with head gaskets?

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That's why I use the new raloc bristle disks.Made from plastic so they don't cut the metal.

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................................................(if) a flat rate technician has touched it (it) probably had a (several) roloc bristle or scotch style touch (all over) the engine.

If anyone has a better (faster) way ( while the "flat rate" time clock is ticking) to clean a sealing surface.........................., I am all ears.(me too!)

Thanks for the picture

Justin

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.......( Ricky. Been there, done that for too many years)

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Is that an alloy or iron block?

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That first picture was after taking .004 off the deck. In this one you can see more clearly where the Roloc disc dug in a little harder. Obviously the blue spots are the LOW spots.

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No offense Dan - there is merit in a warning about using them improperly. That being said if he removed .060 of iron with a rotoloc he used more than a couple and certainly more than what was needed to remove a gasket. Maybe he was trying to remove the indent from the fire ring?
A monkey can destroy anything by not giving a crud.
I see nothing wrong with using the correct abrasive or "finger" disc sapringly to clean off residue, being careful to keep the debris out of the bores and coolant jacket. That is what the directions say to do... Me and thousands of others have been using them since they came out with no results like that when care is taken to do it right.

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He didn't remove .060, more like .006-.007. I've been using abrasive discs for decades, the point here is that the deck of a block or head is not a good place to use them IMO. Buy the way, no offense taken.

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That being said, inexperienced hands can do a lot of damage in a hurry. Now a blue printed performance engine, different story. Not even the same animal.
Doug

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That first picture was after taking .004 off the deck. In this one you can see more clearly where the Roloc disc dug in a little harder. Obviously the blue spots are the LOW spots.

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IMO, The pics arent proving your point. I see very large Uniform Diameter impression marks of different depths in the first two pics.

Evidence of a bad hand rolex disc clean up would be less uniform and sporatic.

In your First pic, the Cylinder tops are untouched by your first shave but the deck clearly shows a wide diameter pattern impression. On the Second cut the "one cylinder" shows the same pattern of the wide diameter cutting impression that the Deck shows on the First cut.

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The low/blue area at the immediate edge of the cylinders, could have been caused from too much grinding with a cookie, but those marks on the outside edges of the deck surface were made with something large in diameter..possibly an older Blockmaster with dull cutters and too fast of travel speed.

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That first picture was after taking .004 off the deck. In this one you can see more clearly where the Roloc disc dug in a little harder. Obviously the blue spots are the LOW spots.

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IMO, The pics arent proving your point. I see very large Uniform Diameter impression marks of different depths in the first two pics.

Evidence of a bad hand rolex disc clean up would be less uniform and sporatic.

In your First pic, the Cylinder tops are untouched by your first shave but the deck clearly shows a wide diameter pattern impression. On the Second cut the "one cylinder" shows the same pattern of the wide diameter cutting impression that the Deck shows on the First cut.

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The low/blue area at the immediate edge of the cylinders, could have been caused from too much grinding with a cookie, but those marks on the outside edges of the deck surface were made with something large in diameter..possibly an older Blockmaster with dull cutters and too fast of travel speed.

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This block is German made and is the two piece type where the entire main cage is unbolted in one piece to remove it. Every machined surface machined at the factory has a Ra value of less than 15 and that includes even the oil pan rail. this is the first time the engine has ever been apart. I guarantee this engine was not decked with a blockmaster. The circular patterns were made with the disc, whether you choose to believe it or not. You're looking at pictures and I was standing over the block, believe me, I can tell the difference.