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  #1  
Old 03-20-2012, 03:43 PM
mattro423 mattro423 is offline
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Default oil pressure issues

yesterday my truck decided to start dropping oil pressure when i come to a stop and I was wondering what it could be? now let start with it's a 95 ram 1500 3.9l v6 OK from what i can tell when its cold its just fine! after it gets warm everytime i come to a stop the oil pressure drops and my oil light comes on and Before i replace the oil pump i want to know if that's the problem or if its the oil pressure sending unit please help!
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Old 03-20-2012, 04:42 PM
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ramvan2500 ramvan2500 is offline
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Originally Posted by mattro423 View Post
yesterday my truck decided to start dropping oil pressure when i come to a stop and I was wondering what it could be? now let start with it's a 95 ram 1500 3.9l v6 OK from what i can tell when its cold its just fine! after it gets warm everytime i come to a stop the oil pressure drops and my oil light comes on and Before i replace the oil pump i want to know if that's the problem or if its the oil pressure sending unit please help!
Hmm, well it could be the sending unit, the pump, or the rear main seal.
The first thing to do is to rule out the rear main seal and the pump. In order to do this you're going to want to connect a mechanical oil pressure gauge to the engine and check the oil pressure, if it is very low then you basically ruled out the sending unit which means that would leave you with the rear main seal or pump. Now if the mechanical gauge reads fine then you can safely assume the sending unit has failed.

Ok with that all on the table their... You're going to want to first drive the truck around until the engine is all nice and warm then you can stop and connect the oil gauge where the sending unit screws in, this ways you get an accurate reading.
I ran into a similar issue where my oil pressure would drop but it wouldn't drop low enough to cause the light to come on, for me my problem was the rear main seal which was evident by the collection of oil on the bottom of the bell housing

Last edited by ramvan2500; 03-20-2012 at 05:04 PM.
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Old 03-20-2012, 05:18 PM
mattro423 mattro423 is offline
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OK thanks i will check my Bell housing cause i just replaced the transmision about 6months ago so i should be able to tell easily i think I'm going to roll the dice and start with a new oil pump can't hurt and if that don't work i will go with the sending unit thanks four getting me started on the right path
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Old 03-20-2012, 05:23 PM
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ramvan2500 ramvan2500 is offline
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OK thanks i will check my Bell housing cause i just replaced the transmision about 6months ago so i should be able to tell easily i think I'm going to roll the dice and start with a new oil pump can't hurt and if that don't work i will go with the sending unit thanks four getting me started on the right path
You might not require a new pump, they're cheap but still. Anyway's if you decide to replace the pump replace the rear main seal while you're at it, only an extra 15.99!
I really think you should just hook up the gauge and check, cause if it's something like a sending unit then hey it's a 5 minute job but if you have to do the rear main seal then setup some time for the weekend.
Oh when you went ahead and removed the transmission did you replace the core plugs on the rear of the block? If not it would of been a good idea!
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Old 03-20-2012, 06:06 PM
mattro423 mattro423 is offline
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yeah i figured most of the day for my repairs i have replaced everything i can when i work on my truck just seems like the oil pump is the only thing i hadn't replaced had a feeling it was coming for some reason but ill be replacing both oil pressure sending unit
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Old 04-10-2012, 09:58 PM
trexler trexler is offline
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if its only dropping pressure when ur truck gets hot then its a good chance ur seals are expanding and making a leak, had this happen to my 97' 3.9 v6. new seals should solve it
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