zekgb

So I am now ready to reassemble my engine and have been prepping the block mating surfaces using CRC gasket remover and plastic razor blades. After several hours I've been unable to remove all of the residue from the mating surface. The rust colored areas in particular still feel slightly rough to the touch, is this normal? If not normal then what else can I do to safely remove the residue in these spots?

davek9

That staining won't come out unless you cut the surface, as long as it is smooth, flat and clean you wont have any issues w/ the new head gaskets sealing.

Edit: I would pick up one of Greg Browns Oil Fill baffles, that stock one is "Cr@#"
Like this:

zekgb

Greg's baffle is in there with the stock baffle installed on top, definitely reduced oil in my intake in the 1k miles I drove the car prior to burning a valve.

davek9

Oh OK good!
I don't think you need both of them as it would make more layers to seal up, being there's only the two # 10mm bolts pulling that sandwich together

zekgb

Pretty sure Greg's instructions said to use both and it's all sandwiched together with dreibond which I guess is magic.

GuardsTurbo

Using a Roloc disc usually does a good job on mating surfaces.

Imo000

How about a flat sharpening stone? Should work well knocking down the high areas but ideally the block should be decked.

Chris Lockhart

Roloc disc is a bit sketchy for a sealing surface as critical as a head gasket. Personally I wouldn't chance it. YMMV. With the studs installed it makes it a pain to do, but a super fine piece of sandpaper/crocus cloth on a piece of glass or flat steel so it prevents creating any low spots works. I didn't like the staining on mine because it made it hard to tell if there were any problem areas. So I cleaned it with PASA Jell 102. Stuff works wonders.

Now I'm trying to figure out how to clean out the coolant area around the cylinders.

Imo000

Stay away from the sandpaper and glass combo if you can. A flat sharpening stone works anlot better, just keep it lubricated.

BC

Those sealing surfaces need to be really clean, in my opinion.

I take apart the blocks and have those surfaces cut.

Mongo

I wish I knew about Pasa-Jell 102 when I did a rebuilt 944 motor a while back. My block still had the stains, but the mating service for the head gasket was smooth after spending HOURS and HOURS of scraping as well as using gasket remover.

It couldn't hurt to try Chris' chemical recommendation first before opting to send the block out for a cleanup, which would up your costs as they would most likely recommend removing the pistons, rods and crank.

hwyengr

Do you have a supplier for smaller qtys of Pasa-Jell? Googling isn't turning up much, best I found was a whole quart for $230.

69gaugeman

Flat honing stone is all that is needed. Knock down the high spots left by prying and banging things around. the critical area is the fire ring. Imre is right to keep it lubricated(water is fine) . Place rags in the cylinders and apply a ring of grease at the top of the cylinder. That should catch any aluminum filings (there won't be much at all). Pull each rag and clean out the bore before rotating the crank.

GregBBRD

I don't use a gasket between any of these layers.

The stock baffle works very well, sitting on top of my oil separator.

Make sure the filler neck is flat....usually not, so usually will need to be made flat.

Use thin layer of Dreibond between each layer. Tighten bolts to 72 inch pounds. Wipe off excess.

zekgb

I went with the razor blade 90° scraping method. After the better part of the afternoon I managed to get all of the rust colored deposits and I'm only left with the black staining on the deck. I've only used a plastic scraper on the bore sealing surfaces but they all feel very smooth.