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Old 03-16-2021, 09:55 PM
scratchee scratchee is offline
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Cleaning a bare block: acid in cylinders?

I have my block stripped bare and am trying to figure the best way to clean it, worst need being the cooling passages. If I use some sort of acid bath, could it damage the cylinder walls? I have no need to do anything with the cylinders, but since everything is stripped off the block I can't exactly "flush" the passages alone since there are openings everywhere.

Is there a standard approach at this stage? Thanks for any advice!
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Old 03-17-2021, 02:53 AM
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Marian Claire Marian Claire is offline
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IIRC. I used a pressure washer after a lot of poking and brushing of the water passages. Had to quickly oil everything to stop flash rusting.

S/V Marian Claire
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Old 03-17-2021, 09:15 AM
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Al Schober Al Schober is offline
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When you clean the passages, pay attention to the small ones in the top of the block. These tend to scale up with raw water cooled engines. A drill bit or a diamond burr in a Dremel tool are good weapons. The passages near the valves don't go straight but have a dogleg in them. Save the acid flush for after things are back together.
This is also a good time to install studs for the cover plate into the water jacket. The original bolts are a known source of leaks.
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Old 03-17-2021, 02:49 PM
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ronstory ronstory is offline
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A sturdy coat hanger and lot of poking in the corners works well for round the cylinder and passages. I also use these mounted int a drill to get into nooks and crannies.

A regular screwdriver can be good for the edges of the passageways.

Also, the most scale I got out of the head was when I replaced the core/freeze plugs. This was after using all the above tools. I was simply astounded as how much extra scale came out after driving in the new plugs.
Portland, OR
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Old 03-17-2021, 07:18 PM
scratchee scratchee is offline
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Thanks everyone. I'll hold off on the acid for now.
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