upper cylinder pitting/erosion - Diesel Truck Forum - TheDieselGarage.com
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post #1 of 5 (permalink) Old 08-22-2010, 08:39 PM Thread Starter
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upper cylinder pitting/erosion

I have a Mazda R2 block here that has severe upper cylinder pitting/erosion.





I bought the short motor in that condition, originally, I just wanted the crankshaft out of it...but now I am thinking about rebuilding it.

My question... what causes this sort of erosion ? I am thinking bad rings and lubricating oil burning on the tops of the liners, but I am only guessing.

Someone else has suggested water leaking.....although all the pics I have seen of water pitting damage, its alot more consistent across the combustion chamber.

Any ideas ?

I have been told, I could re use the block in this condition as the pitting is above the top ring land...although it will need a re bore.
I probably would prefer to fit new liners, rather than take the risk that the pitting could cause further issues, plus I already have a set of new standard size pistons.
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post #2 of 5 (permalink) Old 12-31-2010, 12:37 AM
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I will agree on the oil contamination. The combustion chamber must have been pretty. If the block is not cracked, I would have new sleeves installed. I would wash the damaged sleeve(s) and observe the wear patterns along with the ring faces etc. Do you have any pics of a sleeve washed and with a closer view?

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post #3 of 5 (permalink) Old 12-31-2010, 01:34 AM
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what is all that crap in the water jackets ??

i understand that pitting of the cylinder walls can be
caused by lack of coolant maintenance.

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post #4 of 5 (permalink) Old 12-31-2010, 11:34 AM
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The only thing that stands out to produce the orange color, to me, is the steel cylinder linings. Knowing nothing on the Mazda 4-cylinder engines, I can't say if the linings are wet jackets or not to actually be able to produce the orange chunky build up within the water passages from use. There could have been additives used in this engine as well, who knows.

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post #5 of 5 (permalink) Old 01-17-2011, 04:44 AM Thread Starter
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the liners in this engine are dry....and I ended up picking up some new ones on a closeout sale for about 20% of their normal cost.

and yeah I was planning on having the block dipped to clean all that rubbish out of the block if I decide to re use it.

I bought it of someone else, originally just for the crankshaft, but then decided to see if it was worth fixing to re use, so I could build up a replacement engine offline.

I also read about the pitting but that more on the outside of wet cylinder liners if the coolant is not in good condition.
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