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Dodge Ram 1500 5.9 360 Oil Pressure *help*

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Old 02-17-2010, 07:43 PM
Joe6223 Joe6223 is offline
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Default Dodge Ram 1500 5.9 360 Oil Pressure *help*

I recently noticed that my oil pressure has went down about two psi. It used to always be a 40 at idle and would just go over the 40 mark when regular driving. Lately at stops the needle has been going just under the 40 mark. What could of made this ? And should I worry? My alternator is going could it be less stress on the motor from that going causing the truck less work at idle?

Two Oil changes ago I started going with Mobi
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Last edited by Joe6223; 02-17-2010 at 07:50 PM..
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Old 02-17-2010, 07:55 PM
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Probably just the oil pump on its way out. Rock Auto has a new Sealed Power oil pump for $30.

Here is a DIY on oil pump removal:
http://www.pavementsucks.com/tech-article-31.html

Hope this helps! Welcome To Dodge Forum!
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Old 02-17-2010, 07:58 PM
yakkier yakkier is offline
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Have you checked your oil ? how is your tempature ? also have you changed your oil filter lately ? stopped up oil filter will cause low pressure in the pump and will throw off your over all oil pressure
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Old 02-17-2010, 08:00 PM
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Originally Posted by yakkier View Post
Have you checked your oil ? how is your tempature ? also have you changed your oil filter lately ? stopped up oil filter will cause low pressure in the pump and will throw off your over all oil pressure
A stopped up oil filter will just go into bypass, and that would raise the oil pressure, not drop it.
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Old 02-17-2010, 08:08 PM
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if sludge gets into the pump it will cause it to lower.
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Old 02-17-2010, 08:09 PM
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i am having a similar problem, but my oil pressure drops to 0 when its warmed up and idle, but when it goes up even 50 rpm it shoots right back up, my dad said his old dodge had the same problem and it was the oil pressure sending unit. but im not sure if that would cause it to drop just 2 psi
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Old 02-17-2010, 08:19 PM
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You could do some of the suggestions on here and it wouldn't hurt. I wouldn't woory about it though. The dash gauges are not accurate anyway. You are only really at about 5-7 psi at idle anyway. I run a mechanical oil pressure gauge so it shows exactly what the pressure is.
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Old 02-17-2010, 08:55 PM
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Wouldnt think about it too hard, just check your oil level and color, if its fine just keep an eye on it, my oil pressure is about were yours is at and goes about as far on the high side of 40 when in the gas hard
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Old 02-17-2010, 09:04 PM
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Wouldnt think about it too hard, just check your oil level and color, if its fine just keep an eye on it, my oil pressure is about were yours is at and goes about as far on the high side of 40 when in the gas hard

+1.... Mine moves a little more in each direction and has done it since the day I bought it...
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Old 02-18-2010, 11:46 PM
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I think I am going to replace the oil pump in the spring just to be safe. I noticed today that is was a little warmer out that the gauge drops a needle more. So the warmer it gets the more the pressure goes down how is this going to be when it is 80 degrees out it was barley 50 today??

The oil level is fine and my temp for the motor is at 175-180 (checked today)
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Old 02-18-2010, 11:50 PM
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Just for refrence, 35-80 PSI is normal for these engines (According to the service manual).
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Old 02-18-2010, 11:59 PM
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Just for refrence, 35-80 PSI is normal for these engines (According to the service manual).
That is at 3000 rpm though. Hot my truck runs about 5-7 at idle about 15-20 cruising down the highway and about 40 at 3000 rpm.
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Old 02-19-2010, 12:04 AM
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That is at 3000 rpm though. Hot my truck runs about 5-7 at idle about 15-20 cruising down the highway and about 40 at 3000 rpm.
Really, its that low? I'm between 40 and 60 all the time. 179,000 miles.
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Old 02-19-2010, 12:13 AM
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Really, its that low? I'm between 40 and 60 all the time. 179,000 miles.
Yeah, I have a mechanical oil pressure gauge though. It shows the exact oil pressure. The electrical ones are goofy and don't show actual. My 360 isn't in great shape but its only got 103K on it. I bet if you hooked a mechanical gauge up to your truck you would get similar numbers. My service manual states 35-80 psi at 3000 like you said but it also says that 7 is minimum for curb idle. I was really suprised when I hooked a mechanical gauge to my old 318 (179K) and it showed so low. The idiot light comes on at about 5 psi regardless of rpm when the electric gauge is in. Ironically with no oil pressure sending unit in the idiot light doesnt come on. Every vehicle that I own from now on will get a mechanical oil pressure gauge unless it will mess with the computer. I just like knowing what is really going on.
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Old 02-19-2010, 12:22 AM
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Quote:
Originally Posted by Gerehead8 View Post
Yeah, I have a mechanical oil pressure gauge though. It shows the exact oil pressure. The electrical ones are goofy and don't show actual. My 360 isn't in great shape but its only got 103K on it. I bet if you hooked a mechanical gauge up to your truck you would get similar numbers. My service manual states 35-80 psi at 3000 like you said but it also says that 7 is minimum for curb idle. I was really suprised when I hooked a mechanical gauge to my old 318 (179K) and it showed so low. The idiot light comes on at about 5 psi regardless of rpm when the electric gauge is in. Ironically with no oil pressure sending unit in the idiot light doesnt come on. Every vehicle that I own from now on will get a mechanical oil pressure gauge unless it will mess with the computer. I just like knowing what is really going on.
Really, I dont recall reading that in my service manual. I'll go read it.

I was thinking about putting in a new oil psi gauge. Mine just oddly stays stationary at whatever RPM the motor is at.
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Old 02-19-2010, 12:31 AM
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Really, I dont recall reading that in my service manual. I'll go read it.

I was thinking about putting in a new oil psi gauge. Mine just oddly stays stationary at whatever RPM the motor is at.
I have a sunpro mechanical full sweep I got at autozone for about $15. It isn't the highest quality but I have absolutely no complaints about it. My electrical was always stationary then one day it dipped down a bit. A little while later the main bearings got F***ed up and the electrical would dip way down then climb back up when you touched the throttle.
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Old 07-23-2010, 08:06 PM
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Default Oil Pressure confusion

When I originally got my truck, the oil pressure stayed fairly consistently around 40. About 2 weeks later, the truck started to wait til around 3000 rpm and higher to shift, and when moving, the oil pressure would jump to near 80. I checked the trans fluid, which was low, and put some transmission stop leak and fluid into it. This not only stopped the rough shifting, but also caused the oil pressure to stay consistently around 40 again. However, now it is shifting right, but the oil pressure is jumping when I move from idle to speeds above 30mph. Any ideas why?
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Old 07-23-2010, 08:09 PM
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Oil pressure and the trans are completely unrelated.

If your oil pressure is doing funny things, first step is to verify what is going on with a mechanical gauge. If the mech gauge says you have good pressure, and it is not doing anything odd, replace the sending unit for the in-dash gauge.
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Old 09-08-2011, 11:15 PM
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Kinder a little late now but it ended up being the oil pressure sensor i changed that and ever since its been back to the way it was always at 40 and then a little over 40 when driving. Has over 40 at all times and has over 175k and still running strong
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Old 09-09-2011, 12:02 AM
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Any update is appreciated.
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Old 09-09-2011, 12:02 AM
 
 
 
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