lose oil pressure when engine warm - DodgeTalk : Dodge Car Forums, Dodge Truck Forums and Ram Forums
 
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#1 Old 10-15-2009, 05:22 PM
pb_
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lose oil pressure when engine warm

I've got a 2001 1500 2wd 5.2L Ram and need to replace the thermostat. It usually sticks open and keeps the temp gauge just above the needle's resting place. With Winter coming, I want to get it replaced...

However if it works and the engine heats up, or of I heat up the engine by towing, etc, the temp gauge appears to work fine. Only problem is that when the engine is warm, my oil pressure drops. If I'm coming off of the highway, or slow down from towing (with OD off) the oil pressure drops to nothing and picks up within a couple of seconds only to do it again a short time later.

I know the oil thins as it gets hotter and I'm concerned that I may have some bearing damage/issue where the tolerances are opening too far as the temp rises. Could the oil not drain back fast enough/ weak pump, etc? Any ideas? I'm looking for something simple to ease my mind

Thanks
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#2 Old 10-15-2009, 05:31 PM
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My 93 dak 318 had low oil pressure, which is why I pulled the engine out. Turned out that the cam journals were worn bad. You can live longer by using heavier oil and a can of "Restore" 8 cyl version. Does the idiot light come on when dropping to zero on the presure guage?
Other things I've heard are the passages get gummed up at the sensor or the sensor itself is bad.

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#3 Old 10-15-2009, 05:40 PM
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The (no) oil light and a warning chime occur when it hits zero.
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#4 Old 10-16-2009, 06:28 PM
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how many miles? i would go oil pump over bearings unless you're getting close to 300k

if you go to autozone get the standard volume pump...

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#5 Old 10-16-2009, 10:10 PM
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It's only got 112K on it. Thanks
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#6 Old 10-19-2009, 07:14 PM
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Any other ideas on my I lose all oil pressure at operating temps going from 2000 rpm or higher down to idle?
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#7 Old 10-20-2009, 06:47 PM
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I would try a oil pressure sensor, there like $16 at autozone.

Not to hijack your thread but I'm having a similar issue. I have a 97 ram 1500 4x4 5.2L with 156K miles on it. I did an oil change with 10w-30 pennzoil and frame extra guard filter and for the last two days my oil pressure gauge has been stupid. It runs at 40psi on the freeway and 39psi at idle in gear then would start jumping around. Ok so like above today I replaced the oil pressure sensor and now it reads I only have 20psi go figure.

I'm going to change the oil again this weekend to what I normally use and an stp filter see if the issue goes away.

Any thoughts or suggestions otherwise.....

1997 Dodge Ram 1500 4x4 Sport 5.2L * Auto built 46RE * 4.10 Gears, flowmaster 10series, 315/75/16 firestone mt, MSD Wires, napa brass cap/rotor, Hughes Plenum, B&M deep pan & trans. cooler, 3" TGC lift, Dana 60 Swap

1981 Chevy K20 4x4 5.7L
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#8 Old 10-20-2009, 10:38 PM
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He's already tried an oil pressure sending unit.

One thing you might try, but it would be a bit difficult I think to reach properly, is to remove the oil pressure sending unit, and blow some compressed air back through the port to make sure it's not clogged somehow, but I doubt that's the case.

ONLY other thing I can think of that would cause a gradual loss of pressure would be if you had a chunk of gasket material or chunks of RTV from a poor repair job that fell down into the oil pan, and are getting sucked up against the oil pump screen. If no one's been into any part of the engine then that's probably not the problem.

I'd still lean towards large bearing tolerances around the cam and crank but even at that it would have to be really really excessive for it to be dropping to zero on the dash guage.

You really really should try a mechanical guage hooked up to the sending unit's port. Since Im sure you have an old sending unit laying around you could use that to match up the thread pitch and diameter and come up with a guage and adapter of some sort to thread into the hole and check the pressure with a good analog guage to be sure. Hell it could even be something wrong with the cluster or PCM?? You'll never know unless you check the actual pressure reading though.


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#9 Old 10-21-2009, 05:39 PM
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*Update* Got my mechanical in and it reads 25 psi in park at normal operating temps and 40+ when at 2,000 rpms. Not sure what to think yet. Will have another update tomorrow after I drive it more.

1997 Dodge Ram 1500 4x4 Sport 5.2L * Auto built 46RE * 4.10 Gears, flowmaster 10series, 315/75/16 firestone mt, MSD Wires, napa brass cap/rotor, Hughes Plenum, B&M deep pan & trans. cooler, 3" TGC lift, Dana 60 Swap

1981 Chevy K20 4x4 5.7L
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#10 Old 10-21-2009, 06:02 PM
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Originally Posted by 97black_ram View Post
*Update* Got my mechanical in and it reads 25 psi in park at normal operating temps and 40+ when at 2,000 rpms. Not sure what to think yet. Will have another update tomorrow after I drive it more.
That is good oil pressure. Hopefully it was just the sending unit.

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#11 Old 10-21-2009, 07:00 PM
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97black, agreed, I don't see any problems there.

Good deal!

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#12 Old 10-22-2009, 07:21 AM
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Cool thanks guys.

1997 Dodge Ram 1500 4x4 Sport 5.2L * Auto built 46RE * 4.10 Gears, flowmaster 10series, 315/75/16 firestone mt, MSD Wires, napa brass cap/rotor, Hughes Plenum, B&M deep pan & trans. cooler, 3" TGC lift, Dana 60 Swap

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#13 Old 10-22-2009, 10:36 AM
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I sounds like a blockage at the oil sending unit. How big is the orrafice at the meter u have vs. the orrafice for the oem sending unit. IIRC the sending unit is tiny.

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Next: HD rear lift bags

Gone but not forgotten 93 factory freak CC dakota lifted 4x4 318
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#14 Old 10-22-2009, 10:47 AM
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Quote:
Originally Posted by dizzyD View Post
I sounds like a blockage at the oil sending unit. How big is the orrafice at the meter u have vs. the orrafice for the oem sending unit. IIRC the sending unit is tiny.
If your referring to me there both 1/8".

1997 Dodge Ram 1500 4x4 Sport 5.2L * Auto built 46RE * 4.10 Gears, flowmaster 10series, 315/75/16 firestone mt, MSD Wires, napa brass cap/rotor, Hughes Plenum, B&M deep pan & trans. cooler, 3" TGC lift, Dana 60 Swap

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#15 Old 10-24-2009, 08:05 PM
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Whats up fellas? I've had my ram for 8 or so years and i've fought the oil lamp/ pressure drop for years. 2 engines, 2 oil pumps and maybe 3 oil pressure sending units. Best cure i found was a 160 degree tstat. I don't know what the deal is, but if my truck reaches 180-190 degrees, @ idle, the light will come on and the gauge will go up and down, and eventually stay down. Give it a little gas, it would come right back up. Never did i hear a change in the engine or suffer bad performance. Once i figured out it was temp related, i got the 160 tstat and never saw the light again.

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#16 Old 10-24-2009, 09:51 PM
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You simply cannot accurately tell what your oil pressure is doing by depending on the idiot light on the dash. Like has already been said, you need to connect a "good" mechanical gauge in order to be certain.
Current recommendation from most authorities is at least 10 PSI per thousand RPM. Anything less and its time to start getting concerned.

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