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Location:
Kita-Ku, Sapporo, Japan
Registered:
January 2003
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Re: Silt in sump. Is this amout of metal sediment normal?
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Wed, 02 June 2004 00:45
 
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heh heh, my first 4K was like that... we made a grease sculpture with the stuff.... was at least an inch think inside the motor...
still ran fine for 50K km with hand hone and new rings 
as for the sludge, easy way to tell where it's from is to stick it in a container, use a solvent (maybe acetone) to wash out all the oil, and then get a strong magnet and try to seperate the magnetic and nonmagnetic stuff...
there are only a few sources of metal in a motor..
the first and largest surface area is the bores (by far the largest). this will give ferrous magnetic 'dust' (unless it's all alloy motor  )
if you wanted to get real technical, you could clean and seperate the magnetic dust, weigh it, divide the gram amount by about 7.8 which tells you the cubic cm you have, then work out from the bore area how thick a layer has been removed...
next is the soft metal of the main, big end and other bearings.. non-magnetic. it should wear before the ferrous material that should not be in contact with it.
after that... stuff like piston pins.. the pistons themselves etc etc..
it is most likely just worn material from the bores...
i've taken to running some strong rare earth magnets on my oil filters.. it actually seems to pull this crud out!, a couple more on the sump (like hard drive magnets) actually does pull it out of the oil, but as jayem said, if it's small enough, it makes little difference anyway...
CYa, Stewart
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