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Old 01-16-2015, 04:39 AM   #1 (permalink)
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Talking Head gasket Repair:How to clean the block deck w/ pistons installed

Head Gasket Repair
How to Clean the block surface
Pistons installed.


The subject block is a 4G63, 7 bolt



First roll the crank over till all 4 pistons are at mid stroke

Now find some sort of grease, I am using wheel bearing grease



Get a finger full



Now smear it into a seal around the wall of the cylinder and piston



Now as the block deck is cleaned, the grit will not work down on the rings.

Now the head alignment dowels need to be removed, find something, back side of a drill bit, large bolt, or a drive socket, Is should be close to the ID of the dowel.



Now take vice grips and clamp onto the dowel.
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Old 01-16-2015, 04:41 AM   #2 (permalink)
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Start with wiggle movement, going to a twist when you feel movement,



Walk the dowel out of the block.



Tuck a wad of paper towel or tape in the oil feed hole and oil return holes to avoid grit and gasket making it into the oiling system. (Not pictured)

I prefer a long hard back body board with 80 grit sandpaper.




Now go over the deck surface with light to moderate force to remove the gasket residue.

Use different angles across the block.


Once all the residue is removed, rotate the engine over, so one pair of pistons is at TDC.



Now with rags, or blue paper towels, wipe the grease away, Wipe the Pistons at TDC, and the walls of the cylinders that are at BDC



Now rotate the crank 180*, and repeat.
Do this till you can see the top ring on the piston at TDC.

Once the grease is cleaned up, Wipe the cylinders with a blue paper towel with clean engine oil on it.

Use a solvent, such as brake cleaner, and wipe the block deck.
Install the head alignment dowels back in.

You are now ready to install your head gasket, and finish your build.
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Old 01-16-2015, 07:03 AM   #3 (permalink)
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Will that surface finish work with an MLS gasket?
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Old 01-16-2015, 07:11 AM   #4 (permalink)
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I am curious too, I know that most OEM MLS gaskets require a really smooth and flat surface. But some aftermarket ones(Felpro for instance), claim to be able to deal with the rougher finishes as long as they are straight.
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Old 01-16-2015, 07:25 AM   #5 (permalink)
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As long as you "dull" the grit first , think half wore out.

and use light pressure it will be fine. For stock style repairs.

If going for major increases in HP.... Then have the block decked.
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Old 01-16-2015, 07:28 AM   #6 (permalink)
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Originally Posted by Whoshot View Post
I am curious too, I know that most OEM MLS gaskets require a really smooth and flat surface. But some aftermarket ones(Felpro for instance), claim to be able to deal with the rougher finishes as long as they are straight.
Even tho they are MLS, they have some sort of coating to have the seal on improper surfaces.

The OE is based off of fresh machined surfaces where most aftermarkets are not.
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Old 01-16-2015, 07:29 AM   #7 (permalink)
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Fuck i love closed deck blocks, F...U... honda
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