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  #1  
Old May 24th, 2005, 01:06 AM
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Chris Davis
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Hey Rob, would a porous block casting actually leak oil? I have never seen one, but it does not seem intuitive to have oil leak out of something so small. How do you check?
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  #2  
Old May 24th, 2005, 10:00 AM
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Robert Dassler
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Chris,
You have to visually inspect the block. The ones I have seen were obviously coming through the casting and not from any of the 'usual suspects'. Porous blocks can leak oil or coolant depending on where the porosity is. It is more likely if the fluids in question are under pressure. They can sometimes be fixed by 1) welding, 2) epoxy, 3)wicking loctite (green), or replacing the block. This was more of a problem on the later D2s. I replaced several blocks under warranty for this.
Rob
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Old May 24th, 2005, 04:30 PM
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Chris Davis
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Thanks Rob. The reason that I ask is that I have been battling that slipped cylinder/porous block issue and I really have no clue what it "porous block" means. When someone says I have a porous block and leak exhaust gases into the coolant, I think well hell, it would have to be the cylinder sleeve and the block that is porous or that the sleeve has slipped and I have a porous block on top of a slipped cylinder. Could you shed some light on that? Sorry about the hijack, but it is sort of still on topic! ;-)
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Old May 24th, 2005, 04:39 PM
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Seemed like it makes a good post all on it's own so I split it from the other one
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Old May 24th, 2005, 07:35 PM
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Chris Davis
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Thanks Mike!--I was debating starting a new post altogether but I knew how much you love to do that sort of stuff!
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Old May 24th, 2005, 11:09 PM
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The best way I can think to explain a porous block would be to think of cheese.

Now, your regular american, cheddar, bleu, whatever. Nice solid block of cheese.
But that swiss has all the big holes in it. Imagine in a few of those holes get connected together!

Kinda an extreme, and stupid, analogy... but the concept is the same. It's a metalurgical issue due to something in the casting process and probably related to a change in alloy for the aluminum is my guess. What you end up with is a block of metal that can actually allow thin enough liquids to pass through.

-Hans
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Old May 26th, 2005, 11:15 AM
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jim pendleton
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I think there are more blocks with cracks low on the liner then actual porus block. That is what I would be looking for with a pressure test. A guy(or gal) could pressure test in the truck with the oil pan off to find this problem.

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