Oil pressure too high?? - The 1947 - Present Chevrolet & GMC Truck Message Board Network

aod92 · 03-23-2016, 10:23 AM

I started my truck for the first time last week. The oil pressure climbed past 100 psi. This is on an autometer electric gauge. I'm gonna hook up a mechanical gauge to make sure the reading is correct. When I put the new pump in the motor I used a Melling pump. It came with two springs. I believe one was red and the other was blue. The red one is in the pump. Could the high pressure oil pump really be making this much pressure? I'm sure with it making that much pressure it can't be good.

akdg87 · 03-23-2016, 01:04 PM

could be a bad relief valve on the oil pump or an incorrectly manufactured oil filter. but first verify with a mechanical gauge.

indymachinist · 03-23-2016, 01:52 PM

No, the Melling pump should not make that much pressure at idle. Even with the high pressure spring that is unreasonable.

Like you said, start by checking the gauge. We can go from there.

BR3W CITY · 03-24-2016, 12:38 AM

Are you running the 10295 or the 10296? If your running a higher-volume pump, with the high pressure spring, on a tight motor (meaning new bearings etc, minimal leak-by), then I can see you getting 100-ish psi on cold break in oil.

Did the psi drop after the oil warmup up at all? Melling's "high" spring is around 75psi.

aod92 · 03-24-2016, 05:10 AM

Quote:

Originally Posted by BR3W CITY

Are you running the 10295 or the 10296? If your running a higher-volume pump, with the high pressure spring, on a tight motor (meaning new bearings etc, minimal leak-by), then I can see you getting 100-ish psi on cold break in oil.

Did the psi drop after the oil warmup up at all? Melling's "high" spring is around 75psi.

I'm running the 10295 with the red spring. The motor isn't a new motor though. Prob about 80k on the short block. I didn't let it run very long because I was worried about the pressure. So it didn't even warm up.

BR3W CITY · 03-24-2016, 05:01 PM

The 10295 is the standard volume pump, so there's no reason it should be that high on a used engine. Even with the high spring that seems excessive. Its possible that relief valve is stuck.

aod92 · 03-24-2016, 05:13 PM

I'm Hoping it's just the gauge. I'm gonna run to the parts store tomorrow and buy a mechanical gauge. Fingers crossed! You guys ever try dropping the pan on one of our trucks with the motor still in the truck?

aod92 · 03-26-2016, 04:50 PM

I feel much better now knowing I don't have to drop my pan! Hooked up a mechanical gauge and its reading between 50-60 pounds. Thanks for the help guys!

aod92 · 03-27-2016, 11:46 AM

Here's a vid of it running!
http://s1092.photobucket.com/user/ao...C28C3.mp4.html

03-23-2016, 10:23 AM	#1
aod92 Registered User Join Date: Dec 2014 Location: Plainfield il. Posts: 643	Oil pressure too high?? I started my truck for the first time last week. The oil pressure climbed past 100 psi. This is on an autometer electric gauge. I'm gonna hook up a mechanical gauge to make sure the reading is correct. When I put the new pump in the motor I used a Melling pump. It came with two springs. I believe one was red and the other was blue. The red one is in the pump. Could the high pressure oil pump really be making this much pressure? I'm sure with it making that much pressure it can't be good.

03-23-2016, 01:04 PM	#2
akdg87 Registered User Join Date: Sep 2013 Location: fairbanks, ak Posts: 339	Re: Oil pressure too high?? could be a bad relief valve on the oil pump or an incorrectly manufactured oil filter. but first verify with a mechanical gauge. __________________ build thread 1955 cameo turbo lsx 1993 K1500 Blazer 5.3/4L80e 2009 CTSV Sedan

03-23-2016, 01:52 PM	#3
indymachinist Registered User Join Date: Jun 2015 Location: Indanapolis, IN Posts: 603	Re: Oil pressure too high?? No, the Melling pump should not make that much pressure at idle. Even with the high pressure spring that is unreasonable. Like you said, start by checking the gauge. We can go from there. __________________ -Curt My 1968 Chevy shortbed stepside build

03-24-2016, 12:38 AM	#4
BR3W CITY meowMEOWmeowMEOW Join Date: Sep 2009 Location: MKE WI Posts: 7,128	Re: Oil pressure too high?? Are you running the 10295 or the 10296? If your running a higher-volume pump, with the high pressure spring, on a tight motor (meaning new bearings etc, minimal leak-by), then I can see you getting 100-ish psi on cold break in oil. Did the psi drop after the oil warmup up at all? Melling's "high" spring is around 75psi. __________________ *'66 Short Step / SD Tuned / Big Cam LQ4 / Backhalfed /Built 4l80e / #REBUILDEVERYTHING* MY BUILD THE H8RDCPTR //\\ MY YOUTUBE CHANNEL REV J HD

03-24-2016, 05:01 PM	#6
BR3W CITY meowMEOWmeowMEOW Join Date: Sep 2009 Location: MKE WI Posts: 7,128	Re: Oil pressure too high?? The 10295 is the standard volume pump, so there's no reason it should be that high on a used engine. Even with the high spring that seems excessive. Its possible that relief valve is stuck. __________________ *'66 Short Step / SD Tuned / Big Cam LQ4 / Backhalfed /Built 4l80e / #REBUILDEVERYTHING* MY BUILD THE H8RDCPTR //\\ MY YOUTUBE CHANNEL REV J HD

03-24-2016, 05:13 PM	#7
aod92 Registered User Join Date: Dec 2014 Location: Plainfield il. Posts: 643	Re: Oil pressure too high?? I'm Hoping it's just the gauge. I'm gonna run to the parts store tomorrow and buy a mechanical gauge. Fingers crossed! You guys ever try dropping the pan on one of our trucks with the motor still in the truck?

03-26-2016, 04:50 PM	#8
aod92 Registered User Join Date: Dec 2014 Location: Plainfield il. Posts: 643	Re: Oil pressure too high?? I feel much better now knowing I don't have to drop my pan! Hooked up a mechanical gauge and its reading between 50-60 pounds. Thanks for the help guys!

03-27-2016, 11:46 AM	#9
aod92 Registered User Join Date: Dec 2014 Location: Plainfield il. Posts: 643	Re: Oil pressure too high?? Here's a vid of it running! http://s1092.photobucket.com/user/ao...C28C3.mp4.html

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