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  #1  
Old December 4th, 2006, 09:48 PM
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Chris Snyder
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Oil pressure light

So the other day my oil light came on. I checked the level and everything was fine. The engine didn't sound like it had lost oil pressure (I couldn't hear the lifters or anything). There was no loss of power.

I suspected the oil pressure switch, so I took it out and tested it with an ohm meter. I wasn't able to get a good idea of whether or not the switch was working properly or not. It seems like a difficult switch to test.

My question is whether it's possible I might have an oil pressure problem. I have another switch on the way so that will probably answer the question. I'm leaning towards no, but I'd like to hear some other people's opinions.

Thanks,
Chris
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  #2  
Old December 5th, 2006, 07:54 AM
Andrew Vick
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You may want to drain the oil and rap on the oil pan to see if anything is bouncing around in there. Could be the pickup is loose or clogged.
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  #3  
Old December 5th, 2006, 05:21 PM
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This is a pretty scary scenario. I saw a D90 in the shop once that destroyed its motor due to its owner not knowing that the pick up tube fell off. Light came on, he checked the oil, assumed it was alright and kept driving...........


Neil
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  #4  
Old December 5th, 2006, 05:38 PM
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Chris,
This exact same scenario happened to me a couple of weeks ago (94 D90, 67,000 miles). I just left my house and not less than -mile from home, my oil pressure light came on. Immediately pulled off and shut down. Couldn't find a thing wrong. Drove home and swapped out the oil pressure transducer with the hope that's all it was. Still had no oil pressure. So, I dropped the oil pump and couldn't find a thing wrong. My next step was to drop the oil pan, and so I did. I found that the oil pickup screen was completely clogged with oil coke chips. It turns out the previous owner didn't change the oil regularly and thus the engine has oil coke build up inside. Over time the hardned oil chips off and collects in the oil pan and viola, clogged oil pickup.
I cleaned up the oil pickup thoroughly and put it all back together. Be sure to prime the pump per the maintenance instructions... This solved my oil pressure problems. Although I'm going to put in a oil pressure gauge, I can't stand not knowing the status of the internal oil pressure, the life blood of the motor.
Hope this helps a little... tom
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  #5  
Old December 5th, 2006, 06:09 PM
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Got the same thing in our shop 2 years ago. They made it from Goodland, KS to Denver, with no ill effects, but you could make the pickup bounce in the pan by rapping on it. No idea how they didn't kill it.
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  #6  
Old December 5th, 2006, 07:15 PM
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so basically what you're telling me is that just because it doesn't sound like it has oil pressure, doesn't mean there actually is pressure?
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  #7  
Old December 5th, 2006, 08:38 PM
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Kind of the inverse: Just because it sounds like it has pressure, it doesn't mean there actually is pressure. The oil pan check is quick, painless, and has been seen before.
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  #8  
Old December 5th, 2006, 08:42 PM
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Chris Snyder
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whoops. I mis worded that. Should've been "just because it sounds like it has oil pressure, doesn't mean there actually is pressure?"

Thank you for the tip on the oil pan trick. I won't have a chance to work on it until this weekend so I'll let you guys know then.
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  #9  
Old December 5th, 2006, 08:43 PM
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Good luck. I'd be really surprised if that wasn't it.
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  #10  
Old December 6th, 2006, 08:32 AM
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if you drop the pan do you have to reprime?
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  #11  
Old December 6th, 2006, 08:53 AM
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"if you drop the pan do you have to reprime?"

Generally no. But be prepared to do so if it does not reprime after 10 sec or so.

Ron
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  #12  
Old December 6th, 2006, 09:08 AM
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do you have to remove the front cover to get to it?
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  #13  
Old December 6th, 2006, 09:13 AM
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No, you don't. But there are two bolts often overlooked at the rear of the pan--don't forget those. You will need a socket extension to reach them. Use rightstufff when reassembling.
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  #14  
Old December 6th, 2006, 09:22 AM
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what about the flywheel cover, woudl that get in the way?
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  #15  
Old December 6th, 2006, 11:14 AM
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The two bolts that I was referring to are between the oil pan and the flywheel cover. It won't get in the way. There are about 10 or so bolts that hold on the pan. All are accessible. Remove them all. You will probably need to gently pry the pan off at first since it is probably held on by rightstuff or other gasket stuff. I never use a gasket on my pans, just rightstuff. The oil pick up has a gasket on it where it attaches to the block if memory serves. Personally, since you are in there anyways, remove the oil pickup, clean it, and when reinstalling it, use locktight on the bolts. Total job time is around an hour or two for your first time. No biggie. Could be a half hour job if you use air tools to remove the bolts.
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  #16  
Old December 6th, 2006, 04:39 PM
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if you crank the engine with the coil wire unplugged could it reprime that way?
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  #17  
Old December 9th, 2006, 09:46 PM
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Chris Snyder
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Follow up:

It turned out to just be the oil pressure switch. Replaced it with a $7.00 replacement from Rovers North and all is fixed! Thank you for your help everyone!
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  #18  
Old December 10th, 2006, 08:25 AM
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Excellent. They usually leak like a mofo when they're going out, but at least you got it.
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