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Tractor Talk Discussion Board

Re: Ok Let's talk about cylinder pitting some more


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Posted by trucker40 on March 18, 2008 at 20:22:11 from (69.151.56.248):

In Reply to: Ok Let's talk about cylinder pitting some more posted by Texasmark on March 18, 2008 at 16:56:54:

What I know about is older Cummins diesels.The old motors had high flow water pumps,this would surge so much water through the system it would cause tiny bubbles in the antifreeze.When these tiny bubbles hit the sleeves,they would explode.The old Cummins sleeves were not all that smooth,they were made of cast material that was kind of vulnerable to that happening.Todays Cummins sleeves look like chrome.I saw some that had 900,000 miles on them a few weeks ago and had no ring groove at all.The old sleeves could be ate up by 300,000 miles.They slowed the flow down by putting washers in the head gasket water holes to cut the flow down and that helped.Just putting a water filter on the old motors helped a lot.Now they have the strips that tell you when the water filter needs to be changed.
You dont want to run straight water in any motor because it builds a thin film af rust on the inside of the block.This doesnt let heat transfer as it should and can cause hot spots.That could happen in a liner and cause problems.Antifreeze has rust inhibiter in it and it gets weak.Also the lube is for the water pump bearing.


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