Oil pressure

Tiny
BARTMIL
  • MEMBER
  • 1999 GMC YUKON
  • V8
  • 4WD
  • AUTOMATIC
  • 130,000 MILES
My 1999 GMC Yukon (gas, not diesel) has an oil pressure problem. After a longish drive (3 hours) at relatively high speeds, the oil filter blew out when I went to start the car the next day. All the oil leaked out into the driveway in less than a minute. I took it to my mechanic, who replaced the oil pump, but was worried about the original cause. He had me monitor the oil pressure gauge carefully, over the next few weeks, and there were no further problems (also no long distance drives). A month later, I made another long trip (6 hours) at highway speeds and the next day after this trip, the same thing happened. I started the car, the engine immediately made a loud noise, and as I turned the car off, all the oil poured out into the street. I was away from home, so a local mechanic replaced the oil filter, which was damaged in the blow out and told me that with slow and steady driving home (I went 45-55), it should make it, but that the high pressure problem still exists and I need to find out the original cause. I live in a very remote area, and although I trust and like my mechanic, he isn't equipped for lengthy and complicated puzzles. Any information would be helpful, Thanks.
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Monday, March 21st, 2011 AT 11:51 PM

8 Replies

Tiny
BILLYMAC
  • EXPERT
I believe you have an external oil cooler. If you do you will have aluminum lines going from your oil filter adaptor to your radiator, these can failthis will cause a high pressure situation but will not effect the reading at the guage. As this reading is taken in a different area then the cooler.

There is a pressure regulator in the oil filter adaptor this is a spring loaded pressure relief valve if this part fails the oil filter adaptor and the relief valve will have to be replaced.

It is very strange that it does this the next day. The oil is cold and this prob would normally occur when the oil is hot.I hope this helps I will do some research on this issue and get back with you in a cpl days
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Tuesday, March 22nd, 2011 AT 1:02 AM
Tiny
BARTMIL
  • MEMBER
This is bartmil again. Thanks for the reply, hope further research helps. Just in case it is important, after both of the long distance drives, that precipitated the oil spills, I did not start the cars again until the next day. Again thank you for your response.
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Tuesday, March 22nd, 2011 AT 12:43 PM
Tiny
BILLYMAC
  • EXPERT
Hi please re post your question and put on it attention chev experts I think they will be more help thanks billymac
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Wednesday, March 23rd, 2011 AT 12:54 AM
Tiny
BARTMIL
  • MEMBER
I hope this is how you repost a question.

Attention Chev experts:

1999 GMC Yukon oil pressure
My 1999 GMC Yukon (gas, not diesel) has an oil pressure problem. After a longish drive (3 hours) at relatively high speeds, the oil filter blew out when I went to start the car the next day. All the oil leaked out into the driveway in less than a minute. I took it to my mechanic, who replaced the oil pump, but was worried about the original cause. He had me monitor the oil pressure gauge carefully, over the next few weeks, and there were no further problems (also no long distance drives). A month later, I made another long trip (6 hours) at highway speeds and the next day after this trip, the same thing happened. I started the car, the engine immediately made a loud noise, and as I turned the car off, all the oil poured out into the street. I was away from home, so a local mechanic replaced the oil filter, which was damaged in the blow out and told me that with slow and steady driving home (I went 45-55), it should make it, but that the high pressure problem still exists and I need to find out the original cause. I live in a very remote area, and although I trust and like my mechanic, he isn't equipped for lengthy and complicated puzzles. Just in case it is important, after both of the long distance drives that precipitated the oil spills, I did not start the cars again until the next day. Again thank you for your response. Any information would be helpful, Thanks.

Asked by bartmil
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Wednesday, March 23rd, 2011 AT 1:41 AM
Tiny
JDL
  • EXPERT
What does the oil pressure gage show? I've never seen an oil filter blow-up. Are you using oem oil filter. The oil filter should have a bypass. Can't tell if something is clogged up? Is there any crankcase pressure?

For 5.7 litre engine, 6psi at a thousand rpms.
18 psi at 2K.
24psi at 4K
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Wednesday, March 23rd, 2011 AT 7:07 PM
Tiny
JDL
  • EXPERT
Billymac has a good idea also, if you have an oil cooler. Note below.
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Wednesday, March 23rd, 2011 AT 7:37 PM
Tiny
BARTMIL
  • MEMBER
Thank you. At present, the oil gauge reads normally. After the first blow-out, and the oil pump replacment, my mecahnic had me monitor the gauge closely for a while and it was fine. Enough time had passed before the second long trip, so that I didn't watch the oil gauge continually on the way down, and didn't notice if there were any changes. On the way back, when I went slow and easy, it was fine. I will take these answers to my mechanic and see if this helps. As is probably obvious, I have no knowledge of car mechanics and only now, as a kind of old woman, since my husband's passing, have I had the sole responsibility of taking care of a car. So thanks, again, and I will see what my mechanic says.
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Wednesday, March 23rd, 2011 AT 8:06 PM
Tiny
JDL
  • EXPERT
Let us know what is found? Was the filter expanded or split? Was the oil only leaking at the gasket?
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Monday, March 28th, 2011 AT 5:47 PM

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