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Turned On, Tuned Out
Join Date: Aug 2004
Location: I'd Rather Be...
Posts: 11,391
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You Ever Wonder Why You Get Copper in Your Oil Analysis Sample?
A recent development has been occurring throughout the diesel world. Folks engaging in oil analysis of their engine oil for newer engines have been seeing sporadic increases in copper in their used engine oil analysis. Most new diesel engines have oil coolers - inside those coolers is a network of small honeycombs plated with copper.
The zinc dithiophosphate used in many engine oils as an anti-wear component that will leach the copper. It won't hurt you per se but it does monkey up the oil analysis results making you think that you could be getting wear from valve train bushings, wrist pin bushings, cam bushings, thrust washers, governors, connecting rods bearings, valve gear train thrust buttons. Here is a pic I just took - about 40X magnified. You can see the copper. Sounds simple enough but the OEM (Izuzu for GMC) had no clue this was going on. Even more surprising was the lead I have been seeing leach out of Cummins engines. Thats a whole other story. 
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Inter faeces et urinam nascimur Share My Work Ethic Not My Wealth |
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07-31-2009, 06:47 AM
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Registered User
Join Date: Oct 2001
Location: Houston (Friendswood), TX
Posts: 15,642
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interesting stuff Lubey!
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Steve Weather at Home '97 Miata - me -- '99 Miata - wifey -- '88 targa  SOLD 2004 - gone but not forgotten
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07-31-2009, 06:51 AM
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Registered User
Join Date: Oct 2001
Posts: 10,148
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"Plating" is an important word in the analysis, yes? The oil circuit on a 911 has no plated part (none that come to mind right now) that comes in contact with the oil. The key is understanding the system and what it's made off before making a final analysis. I'm not sure a lot of wrenchers think deep enough....
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Our drinking team has a racing problem. We sponsor Guinness buy the case! ..slow to grid, but damn fast to pit...that's where the Guinness is fool! ChicagoPorsche - for the locals Last edited by Soukus; 07-31-2009 at 07:06 AM.. |
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07-31-2009, 07:04 AM
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Registered User
Join Date: Feb 2002
Location: Fort Campbell, KY/Afghanistan
Posts: 176
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So, care to elaborate about the lead in the Cummins engines? Is it something I'd need to worry about?
Thanks
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1978 911SC (lost in divorce) 1969 Montesa 360 GP 1999 Dodge 2500 Cummins Diesel (lost in divorce) |
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07-31-2009, 07:05 AM
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Wood Magician
Join Date: Jun 2002
Location: Bay Area, Oakland
Posts: 413
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The early 911 oil tanks are copper plated inside and out, 67-70 are for sure
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07-31-2009, 09:16 AM
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Turned On, Tuned Out
Join Date: Aug 2004
Location: I'd Rather Be...
Posts: 11,391
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Quote:
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Inter faeces et urinam nascimur Share My Work Ethic Not My Wealth |
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07-31-2009, 11:20 AM
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