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  #16 (permalink)  
Old 05-17-2011, 10:55 AM
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Don't have an explanation, don't know if the filters were so bad they were bypassing or even what they had for filters. I am only letting you know what was found. Abrasive material that was of the type used in the cleaning disks. Bearings were a mess on the one we took apart

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  #17 (permalink)  
Old 05-17-2011, 12:42 PM
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I've installed a couple of different aftermarket engines, on the info provided, they both said they will void any warranty if abrasive disc are used on parts that transfer from the old engine to the new.
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Old 05-17-2011, 01:13 PM
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Particulates finer than what the filter media catches are constantly circulating through an engine. Steel, aluminum, copper alloys, carbon, dirt, etc. Filters do not catch everything, as we all know- Wix automotive oil filters catch contaminant particles larger than 25 microns, for example. If the filter were to be fine enough to catch everything, the pressure required to get oil through it would be high, and the filter would clog sooner w/the possibility of it bypassing unfiltered oil back through the engine to keep it from starving the bearings.

What I'm curious about is what makes the sub-25 micron material that the discs are made of cause bearings to fail, when the other particulates are able to pass through the bearing clearances w/o a problem.
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Old 05-17-2011, 06:01 PM
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Quote:
Originally Posted by cobalt327
Particulates finer than what the filter media catches are constantly circulating through an engine. Steel, aluminum, copper alloys, carbon, dirt, etc. Filters do not catch everything, as we all know- Wix automotive oil filters catch contaminant particles larger than 25 microns, for example. If the filter were to be fine enough to catch everything, the pressure required to get oil through it would be high, and the filter would clog sooner w/the possibility of it bypassing unfiltered oil back through the engine to keep it from starving the bearings.

What I'm curious about is what makes the sub-25 micron material that the discs are made of cause bearings to fail, when the other particulates are able to pass through the bearing clearances w/o a problem.
These disc's are made of very fine particles, that are harder then the material they are made to remove. Every precaution needs to be taken, when
using them.

These fine particles, and the material cleaned will score the cylinder walls, and scratch the rings sealing edge. Much like a cylinder hone is made to do, to seat the rings.

That being said, is like honing a block with 800 grit stones. These fine particles from 800 grit, if not cleaned properly, will stay suspended in the oiling system, and take out the softer material made crankshaft, and engine bearings. No filter system made can remove these fine particles from the oil. At least none that I know of.

Stephen
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Old 05-17-2011, 09:47 PM
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After a bit of research, I'm satisfied that I understand why wear from the abrasive disc (or anything else) happens.

So carry on gentlemen...
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Old 05-18-2011, 03:18 PM
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alternative method?

What would u guys consider or recommend, an alternative method for cleaning surfaces that would be both safer and time efficient?
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Old 05-18-2011, 03:34 PM
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Very sharp gasket scraper, or fresh single edge razor blades. With a final buffing by hand, using a sponge block of sand paper. This procedure needs to be done lightly, with just enough pressure to remove material, not the sand from the block, checking frequently for a clean surface.

There is no 'quick and easy' way to do this.

The extra time spent equals less problems, or 'come backs'.
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Old 05-18-2011, 03:40 PM
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On machined surfaces I always use razor blades and a can of carb spray or lacquer thinner/acetone and a rag to follow up with.
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