Oil leak behind PS pump on a 96 - Dodge Cummins Diesel Forum
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Go Back   Dodge Cummins Diesel Forum > 2nd Gen. Dodge Cummins 94-98 12V Forums > 94-98 Powertrain
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Old 01-17-2011, 01:30 PM   #1 (permalink)
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Oil leak behind PS pump on a 96

I'm seeing an oil leak coming from somewhere behind the PS pump on our 96. I've checked the PS hoses and all seems sound. I degreased the engine and can see a trickle of what looks to be engine oil coming from somewhere just below/behind the IP. Since it's raining like crazy here, I'm trying to find a diagram of the left side of the engine. If anyone knows of a drawing or has any bright ideas, I'd sure appreciate it. Thanks.
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Old 01-17-2011, 11:47 PM   #2 (permalink)
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Now that the monsoon has passed, I'm still at a loss as to where the oil's coming from. Does anyone have a schematic/photo/whatever of what's going on on the driver's side of the 12V engine? Standing beside the truck, looking at the PS pump with a light, I can definitely see it moving down the side of the freshly cleaned block. Since we tow horses constantly with this rig, this needs to get sorted out as quickly as possible. Is there an oil pressure sensor in that area that may be giving up?
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Old 01-17-2011, 11:52 PM   #3 (permalink)
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it might be the tapped cover leaking
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Old 01-18-2011, 12:01 AM   #4 (permalink)
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Tappet cover? Good suggestion, I've seen that with other engines. Let me do more of a search.
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Old 01-18-2011, 01:36 AM   #5 (permalink)
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tappet cover, oil pressure sending unit or the oil feed line to the injection pump and vac pump

Pretty much the only things that are going to be leaking in that area
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Old 01-18-2011, 11:40 PM   #6 (permalink)
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also look around the vacuum pump if its leaking in a $15 dollar fix from cummins for a seal kit and only takes an hour or two to change them out
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Old 01-19-2011, 12:08 AM   #7 (permalink)
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If the vacuum pump is leaking, what oil comes out...engine or power steering?
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Old 01-19-2011, 06:39 AM   #8 (permalink)
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Motor oil.
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Old 01-31-2011, 08:12 PM   #9 (permalink)
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Ok,
I finally got back to this little problem. After lots of degreasing, it appeared to be either the oil sending unit of whatever lies directly over it. Being the eternal optimist, I replaced the sending unit and hoped for the best...wrong! I'm really thinking it's the tappet cover at this point (rats), so I'm guessing the IP needs to come off to get at it. I'm used to the 99 I drive, so this is new territory. Any words of advice? Time to search again.
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Old 01-31-2011, 09:49 PM   #10 (permalink)
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ive got the same problem with my 95 what did it end up being?
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Old 01-31-2011, 09:55 PM   #11 (permalink)
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Not sure yet, but I'll post what I find. I'm currently looking for a good article on IP removal for the unfortunate.
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Old 01-31-2011, 10:53 PM   #12 (permalink)
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I had the same symptoms myself, leaking a cup or so of oil per day. After looking carefully and research I found it was the tappet cover leaking. Oh boy what a pain in the . Take your time. One thing I have to note is how it seems all the expensive replacement parts are right out in the open and the $10. POS replacement gasket is a few hours work to get to. Yes the injection pump must come out alone with the fuel filter housing. If you need help search this site before asking questions because this is fairly common. There are a number of reasons why it leaks, mine was just old (320k) and disintegrated. One thing that cannot be overstated...MAKE SURE YOU THOROUGHLY and I mean THOROUGHLY clean the IP shaft and the IP gear. If you don't you will damn sure regret it take my word for it. Good Luck with the fix.
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