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Old 07-10-2012, 02:31 PM
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Question about oil pressure on chevy sb ?

Its 1988 1500 chevy truck with a 350, I just got it about 2 months ago and have been fixing one thing after another ,and I put a 2 inch oil pressure gauge in cause the one in dash wasent working. I changed the oil about month ago and oil didnt look to bad but i took the vaule covers off to change gaskets and too my surprize there was so much sluge from them not changing the oil right and not good oil. I did clean the covers and top of heads and was carefull about droping any sluge down the oil gallerys. so after all that been driving it alittle maybe 50 miles or so and oil pressure at idle, when stopped , would be between 5-15 pds and driving about 55 mph would be around 50 pds but now its between 20 -40 driving ,and below 5 pd mark at idle . I was going to change oil after driving it about hundred miles but fixing to change it today. but i guess my question is ,if the oil pressure at idle is about 5 pds or so, that should be ok im guessing. I dont drive truck much ,maybe 50 miles or less a week. sorry so long guys . and plus the air temp is around 95 , and my engine temp while driving is around 165.

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Old 07-10-2012, 05:11 PM
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No, 5 pounds isn't enough at idle, you can get away with 7-10 but even that's pushing it. Sounds like the old girl is just worn out and needs a rebuild. What you took out and disturbed could cause a problem but doubtful. If you can drop the pan with releative ease my guess is you'll find sludge and lots of it. SBC will run 60 cold,20/30 at idle when warm and 40/50 when warm. All things being good.
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Old 07-10-2012, 05:26 PM
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Sounds like the oil pump screen is partially plugged with gunk. What brand of oil filter do you have on it (hopefully not Fram).
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Old 07-10-2012, 07:06 PM
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Originally Posted by S10 Racer View Post
Sounds like the oil pump screen is partially plugged with gunk. What brand of oil filter do you have on it (hopefully not Fram).
Thats what im thinking to ,and yes i have a fram oil filter. I just changed the oil and filter. when i cranked it ,the oil pressure was at 60 but didnt didnt drive it yet. I know its alot of trouble,but do you think it would be worth it to drop the pan and ck the screen, and if i went that far i would go ahead and change the oil pump. but first going to drive it some.
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Old 07-10-2012, 07:21 PM
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you didn't mention what oil viscosity rating you are useing. Try something a little heavier for summer driving.
It's amazing how much abuse the sbc will take and still run.
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Old 07-10-2012, 07:54 PM
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Do yourself a favor and place that fram filter in the garbage and get a WIX filter or hastings
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Old 07-10-2012, 08:17 PM
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Quote:
Originally Posted by robbie43 View Post
Thats what im thinking to ,and yes i have a fram oil filter. I just changed the oil and filter. when i cranked it ,the oil pressure was at 60 but didnt didnt drive it yet. I know its alot of trouble,but do you think it would be worth it to drop the pan and ck the screen, and if i went that far i would go ahead and change the oil pump. but first going to drive it some.
You might try and put some sea foam in the crankcase and drive it a while to loosen the gunk, change the oil again and see how it does. Heres a link.

Sea Foam | Using Sea Foam Motor Treatment in Crankcase Oil | Tech Info - Diesel Engines
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Old 07-10-2012, 09:53 PM
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Do yourself a favor and place that fram filter in the garbage and get a WIX filter or hastings
I tried throwing it in the trash but it was full of wix filters and hastings filters lmao
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Old 07-10-2012, 10:10 PM
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Put in a bottle of Lucus heavy duty engine oil stabalizer, the stuff is pretty kick axx, it will by you some time.
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Old 07-11-2012, 08:59 AM
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Put in a bottle of Lucus heavy duty engine oil stabalizer, the stuff is pretty kick axx, it will by you some time.
I did ,and went with 30 w motor oil, I just drove it about 25 miles and after the engine got hot, and at idle ,the oil pressure was at 8-10 and driving around 40 .. I made alot of stop and go's so like you said ,hoping it will by me some time thanks
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Old 07-11-2012, 09:57 AM
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Quote:
Originally Posted by robbie43 View Post
I did ,and went with 30 w motor oil, I just drove it about 25 miles and after the engine got hot, and at idle ,the oil pressure was at 8-10 and driving around 40 .. I made alot of stop and go's so like you said ,hoping it will by me some time thanks
Before jumping through any hoops, change the oil filter. I don't care what brand. If the filter gets obstructed the pressure can fall, especially if the bypass has been blocked off.
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Old 07-11-2012, 12:38 PM
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Quote:
Originally Posted by robbie43 View Post
I did ,and went with 30 w motor oil, I just drove it about 25 miles and after the engine got hot, and at idle ,the oil pressure was at 8-10 and driving around 40 .. I made alot of stop and go's so like you said ,hoping it will by me some time thanks
I ran a 350 like that in my 78 Blazer for more than a year, if you stuck your head under the frount end with engine idling you could hear the rods gurgling like a baby, it was halarryas. that motor never blew! it will be ok as long as it dosnt start knocking.
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