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TRex
Senior Member
89 Posts |
 Posted - 12/08/2020 : 1:06:41 PM
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Anybody seeing aluminum content high in their oil samples? And iron? Got 8 buses so far with aluminum anywhere from 40 ppm to 255 ppm. Iron 82 ppm to 459 ppm. These are the kind of numbers that show up on EPA 2010 MaxxForce DT's. The one that wear the cylinder walls out.
Just throwing this out for some quick feedback. 2 fleets. Not sure on years but probably 2017 and up. FWIW NAV has a letter out that says two oil sample greater than 50 ppm change the EGR mixer box. On the NAV engines The intake and EGR crossover tube needs changed also IMHO. Thanks |
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Bluenozer
Top Member
Canada
645 Posts |
Posted - 12/09/2020 : 02:36:16 AM
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| alot of dead idle will produce this, soot will stop rings from rotating on pistons and then it starts to scuff the liners |
OEM trained in wiring and all engine platforms for over 20 years
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TRex
Senior Member
89 Posts |
Posted - 12/09/2020 : 10:36:56 AM
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| So basically what is called carbon packing. Short of a teardown can this be reversed? The one (and only one) problem I have not seen on MaxxForce. With them aluminum source is the intake pieces. Either vibration or acids produced by high EGR flow. The 6.7 is a non sleeved engine correct? So this becomes a block replacement? Or overbore and dry sleeve? BTW Thank you for the reply |
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Brook Peacock
Senior Member
116 Posts |
Posted - 12/09/2020 : 11:33:42 PM
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| How can you prevent this from having in the future? |
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Bluenozer
Top Member
Canada
645 Posts |
Posted - 12/10/2020 : 03:52:51 AM
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when sitting for more than five minutes crank up idle using the speed set buttons, let the engine cool WHILE running after trips( to properly spool down turbo and dissipate heat from the EGR cooler) ump up oil changes (our fleet 12,000km and change the oil, grease every 3,000km) biggest thing is no dead idle , this is the cause of most failures on EPA 07 and up engines heard of people using SEAFOAM as service tool usually every 3 months or so (EGR engine causes alot of oil contamination) that will eat bearings and rings
6.7 no sleeves correct we have bored them out in chassis CUMMINS offer over sized ring sets also |
OEM trained in wiring and all engine platforms for over 20 years
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Edited by - Bluenozer on 12/10/2020 08:31:14 AM |
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Mechan1c
Top Member
USA
853 Posts |
Posted - 12/10/2020 : 09:03:05 AM
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I'm not seeing that in 2016-18 6.7's or '15 MFDT's.
My 6.7 Al numbers are single digit, and the MFDT's are between 10-20. I did have a MFDT spike when it lost an EGR cooler...
We average about 15 mph on the fleet so we try to compensate on the intervals knowing that. We run 5W40. Pacific NW... |
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Bluenozer
Top Member
Canada
645 Posts |
Posted - 12/10/2020 : 11:20:27 AM
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10w30 here in NS Canada
EGR engine are the worse, when I was a younger I remember rolling bearings in CATS , DETROITS at a million clicks(not rebuilt either) , since EGR was introduced an engine might get 700,000km and need an over haul lol
Imagine your doctor saying heres a tube that will run from your butt to your mouth and you just eat a little throughout your day, imagine what would happen to your guts, when just setting injector trim files up better you can get the same reduction in GHG politics |
OEM trained in wiring and all engine platforms for over 20 years
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Mechan1c
Top Member
USA
853 Posts |
Posted - 12/10/2020 : 6:10:32 PM
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| Ha! You made my night... That's a great way of looking at it! And because no one likes hot poop, you can get a cooler half way up the line that explodes every once in a while... |
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TRex
Senior Member
89 Posts |
Posted - 12/11/2020 : 10:26:17 AM
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| I have heard of SeaFoam but not sure how it is applied. Is it a fuel additive? On the EPA 2010 MFDT engine there can be a problem with aluminum coming out of the intake pieces. I think it is called precipitation. Did not effect all engines. Most that failed in warranty got coated (like bedliner) intake pieces. IF your alum ppm is over 50 two samples in a row you might want to look at iKnow 2013372. If caught soon enough process can be stopped. Will save the engine. For at least a while! |
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Bluenozer
Top Member
Canada
645 Posts |
Posted - 12/14/2020 : 02:44:35 AM
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| oil additive or spray into intake while engine running are the two bottles I know of, water sprayed into intake also will steam the components to release crud, my biggest issue is the crud goes on top the piston, and the green spray was adapted by Cummins and Detroit also but the failure is the egr causing caustic chemicals that deteriorate metals (heartburn lol) |
OEM trained in wiring and all engine platforms for over 20 years
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Cummins ISB 6.7 Aluminum in Oil
