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Location:
Epping, Sydney
Registered:
April 2003
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Location:
Finland
Registered:
November 2002
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Re: Silt in sump. Is this amout of metal sediment normal?
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Tue, 01 June 2004 13:44
 
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Think about how much of that metal powder has departed off in every oil filter change? Where has it came from? and why that isnt in oil filter ie. how many times that silt has gone through your motor? Scary isnt it?
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Location:
Epping, Sydney
Registered:
April 2003
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Re: Silt in sump. Is this amout of metal sediment normal?
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Tue, 01 June 2004 22:11
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yeah totally what I was thinking..
like sandpaper.. lucky it isn't my motor... lol, but I am scared for mine now 
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Location:
Finland
Registered:
November 2002
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Re: Silt in sump. Is this amout of metal sediment normal?
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Tue, 01 June 2004 22:21
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But then again, you dont have nothing to worry about as long as the biggest particle in oil system is smaller than smallest clearance in the motor. Smallest clearance is normally something like 0.02mm.
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Location:
1st street on the right
Registered:
November 2002
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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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Location:
Brisbane
Registered:
February 2003
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Re: Silt in sump. Is this amout of metal sediment normal?
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Wed, 02 June 2004 01:15
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i've taken to running some strong rare earth magnets on my oil filters..
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I like that! I might try somthing like that soon (I have a dead HDD here out of warrenty)
Slightly O/T but...I've recently accquired a series 4 rx7 oil cooler, I want to clean/flush it before I plumb it in. What is a good method to get any gunk that may be left in there, out?
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