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2nd Gen Ram Tech 1994-2001 Rams: This section is for TECHNICAL discussions only, that involve the 1994 through 2001 Rams. For any non-tech discussions, please direct your attention to the "General discussion/NON-tech" sub sections.

Oil Pressure Woes

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  #1  
Old 04-29-2013, 08:49 AM
Travis99Ram Travis99Ram is offline
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Default Oil Pressure Woes

Ok so I had the problem of my oil pressure gauge dropping whenever the rpm's would drop and would rise when I accelerated again. Through search of other threads I found the culprit was the oil pressure sending unit...so I replaced but I still ave the problem, just not as often and the oil pressure will rebound on its own without me giving it gas, also the needle will bounce around a bit...what else could be giving me this problem taking into consideration that the sending unit it new?
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  #2  
Old 04-29-2013, 09:27 AM
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Ham Bone Ham Bone is offline
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Stick a mechanical gauge on it.

Do you hear any ticking?
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Old 04-29-2013, 10:10 AM
Arde Arde is offline
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+1 on the mechanical gauge, the OEM oil pressure gauges on these Dodges are worthless.
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Old 04-29-2013, 10:21 AM
dodge dude94 dodge dude94 is offline
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Another +1 for the mechanical gauge.

It could also be as simple as having the oil pickup junked up.
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Old 05-05-2013, 05:46 PM
Travis99Ram Travis99Ram is offline
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Okay, so I put a mechanical oil gauge in and at first the pressure was reading fine about 40 psi, then it dropped to just below 20. And wont rise unless I give it some gas then drop again once I let off. The motor has enough oil in it. So where do I go from here?
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Old 05-05-2013, 05:58 PM
Travis99Ram Travis99Ram is offline
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Quote:
Originally Posted by Ham Bone View Post
Stick a mechanical gauge on it.

Do you hear any ticking?
Ticking from where? The new mechanical gauge?
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Old 05-05-2013, 06:30 PM
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dhvaughan dhvaughan is offline
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miles on engine?

to squeeze more life from the engine, drop the oil pan and replace the oil pump with a new "high volume" pump. also clean or replace oil pickup tube. if the rear main seal is leaking, replace it too.

http://www.pavementsucks.com/tech-article-31.html
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Old 05-05-2013, 06:48 PM
Travis99Ram Travis99Ram is offline
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Originally Posted by dhvaughan View Post
miles on engine?

to squeeze more life from the engine, drop the oil pan and replace the oil pump with a new "high volume" pump. also clean or replace oil pickup tube. if the rear main seal is leaking, replace it too.

http://www.pavementsucks.com/tech-article-31.html
The engine has 147k on it. Ok, so a new oil pump is on the agenda, thanks for the help.
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Old 05-05-2013, 09:51 PM
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lifter ticking

your pick up tube could be clogged as stated earlier
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Old 05-05-2013, 09:58 PM
Travis99Ram Travis99Ram is offline
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Quote:
Originally Posted by Ham Bone View Post
lifter ticking

your pick up tube could be clogged as stated earlier
I don't hear any lifters tapping.
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Old 05-05-2013, 10:45 PM
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Curious, what weight/brand of oil are you running? At a minimum, I'd drain the oil and drop the oil pan. I suspect you may have a good bit of sludge in the pan and it may be getting into the oil pickup..
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Old 05-05-2013, 11:07 PM
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As long as you have the pan off, you could plastigage your bearings so you know what shape they're in.
Oil pressure just under 20 at idle is OK, but not going over 40 when revved is a bit low.
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Old 05-06-2013, 12:58 AM
Travis99Ram Travis99Ram is offline
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Quote:
Originally Posted by AtomicDog View Post
Curious, what weight/brand of oil are you running? At a minimum, I'd drain the oil and drop the oil pan. I suspect you may have a good bit of sludge in the pan and it may be getting into the oil pickup..
I'm running conventional O'Reilly's 10w30. I have also replaced a quart with that Marvelous Mystery oil additive when all this began, in hopes to solve my problem, the bottle claimed to clean all that sludge stuff up. Don't really know if it did what it said it would do or not. If I got to tear into it that much, wouldn't it be wise just to replace the oil pump since it has so many miles on it anyways?
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Old 05-06-2013, 01:02 AM
Travis99Ram Travis99Ram is offline
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Quote:
Originally Posted by Arde View Post
As long as you have the pan off, you could plastigage your bearings so you know what shape they're in.
Oil pressure just under 20 at idle is OK, but not going over 40 when revved is a bit low.
Just now the gauge is reading 10 psi at idle, and for me to get it to 40, I have to rev to about 4 grand...not good.
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Old 05-06-2013, 01:39 AM
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Download the FSM here:
http://dodgeforum.com/forum/2nd-gen-...e-manuals.html
It tells how to check your oil pump clearances to see if it's the culprit or not.

If it is, replace with a Melling oil pump, problem solved.
If not, plastigage your bearings. If worn replace with Clevite bearings.

Or it could be as simple as the pickup tube plugging up as stated.

You have a 4x4 or 2WD? Just out of curiosity.
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Old 05-06-2013, 11:49 PM
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Quote:
Originally Posted by Travis99Ram View Post
If I got to tear into it that much, wouldn't it be wise just to replace the oil pump since it has so many miles on it anyways?
yes. once the pan if off and you've cleaned or replaced the pickup tube and cleaned any/all sludge from the pan, you might as well put on a new pump.

also - you want to put a high volume pump on it. higher volume will create higher pressure and make up some for the worn clearances. get the melling high volume pump.

yes you can plasti-gage the bearings and replace them, but you need to be careful, take your time, and know what you're doing.
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Old 05-07-2013, 12:13 AM
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Ditto on replacing pump and pickup screen. Mine was doing same thing and it still has great pressure at 224,000 miles after replacing pump around 190,000. It was all sludged up from not doing regular oil changes.
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  #18  
Old 05-09-2013, 12:04 AM
Travis99Ram Travis99Ram is offline
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Well fellas, yesterday I changed my oil pump. I went with a Melling HV and I'm still have the same problem with the low oil pressure. Where do I go from here? Not sure if my wallet can handle much more of this.
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Old 05-09-2013, 02:24 AM
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^^^ Rebuild it, re-bearing it (yes the cam bearings as well), find a good used motor and do a swap.
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Old 05-14-2013, 01:05 AM
Travis99Ram Travis99Ram is offline
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I went and talked a couple different mechanics the other day, one of which confirmed that it is in fact the cam bearing/cam that is causing all my problems. The other mechanic runs the service department at my local Dodge dealership, told me to do a compression test on each cylinder, to see if that's where I'm losing my pressure. That was an unexpected piece of advice, does that sound right to anyone else? Back to the first mechanic, said not much else I could do others than rebuild it or find another motor, but for now I could change the oil and go with thicker like 20w 50. So that's what I just got done doing and it kind of helped...its running 19-20 psi at running temp idling at will hang around 40 psi cruising down the highway @ 60mph. I know its not a fix, more like a band aid for something that needs fixed, but it really isn't possible for me to get a different motor and pay someone to do the swap, I admit that's a job I dont feel confident in doing myself and don't have the place to do it. But just wanted to tell everyone thanks for all their input in helping me out with this problem.
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Old 05-14-2013, 01:05 AM
 
 
 
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