1st Generation Dodge Cummins 89-93 Discussion of 12 Valve 5.9 Liter Dodge Cummins Diesels with Rotary Injection Pumps

New to Cummins, Possible Dead Oil Pump?

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  #11  
Old 10-15-2011, 08:27 PM
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and well make the oil look like metallic paint
 
  #12  
Old 10-15-2011, 08:51 PM
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Default New to Cummins, Possible Dead Oil Pump?

Cam bearings are made out of much harder material than the journal bearings. Could be cam bearing material or a full on failed journal bearing. Either one will cause a major oil pressure drop.


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  #13  
Old 10-15-2011, 08:54 PM
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Oil did not look like metallic paint, it looked like normal used oil with a couple metallic specks here and there (but not many). Think something could have failed behind the front cover?
 
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Old 10-15-2011, 11:18 PM
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KDP took out oil pump gear possibly
 
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Old 10-16-2011, 02:21 AM
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X2 tiremann9669

Lets hope you get lucky and it is just the oil pump. go fishing in the old oil with a magnet and see if you get an more metal out of it.
 
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Old 10-16-2011, 01:55 PM
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I went through the rest of the oil with a magnet and just got a few more tiny specs, no chunks or anything. And I literally did the KDP fix less than 200 miles ago and loctited the bolt in, plus it was nowhere near out when I checked. Maybe something else came out behind the cover? I need to find a spot other than the parking lot that I can wrench on it, so I can take the front end apart to the point where I can easily remove the front cover.
 
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Old 10-16-2011, 10:27 PM
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Did you loctite all of the case bolts ?
 
  #18  
Old 10-16-2011, 10:51 PM
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I don't like the looks of that drain plug at all. I'm thinking top-end issues, based on the way it went down.
 
  #19  
Old 10-17-2011, 01:09 PM
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The only bolt behind the front cover that came out was the one for the KDP fix and it got loctited.

What makes you think it was something in the top end? I feel like the oil pump had to have failed to start it all, since the first symptom of something wrong was my oil pressure disappearing.
 
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Old 10-17-2011, 06:50 PM
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From what you stated originally:

Engine had 300k miles. Maintenance history? Valve adjustments?
Originally Posted by Spartan Inferno
the truck started blowing black smoke and stopped accelerating.
Turbo blew. Oil pressure went right along with it, since there is no longer any resistance to flow through the turbo feed.
Originally Posted by Spartan Inferno
I limped it off the road and into a parking lot, and it made a pretty nasty clunk sound and shut off.
KDP was already fixed, so what makes the clunk in an engine like that?
Originally Posted by Spartan Inferno
....makes a pretty bad noise when you crank it,
Something came apart, most likely dropped a valve or 2, would be my guess.

Like was asked before: Where does the ferrous wear metal come from?
 

Last edited by NadirPoint; 10-17-2011 at 07:15 PM.


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