 oil pressure relief valve(s), heavier spring to increase oil pressure? |
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| pete914 |
 Apr 1 2008, 05:05 AM
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#1
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Member  Group: Members Posts: 178 Joined: 21-August 07 From: east coast Member No.: 8,025  |
Hey,
So I'm running 20w50 and losing oil pressure after the car has warmed up. I heard I can take out th oil pressure relief valve, stretch the spring a bit (or replace it with a heavier duty one) and get an increase in pressure. Now there's more than one...like three right? Which one should I pull out? Is there even any truth to this? Right now I'm running at 0-2 psi at idle and 20-25psi at 3k push rod seals are leaking like crazy (fixing those next weekend and i thought i would do this at the same time.) Maybe this is just covering up other problems, but I don't have a place to rebuild an engine, so I needs' me a quick fix... (IMG:style_emoticons/default/sad.gif) Thanks |
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| Dave_Darling |
Apr 1 2008, 09:26 AM
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#2
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914 Idiot Group: Members Posts: 14,986 Joined: 9-January 03 From: Silicon Valley / Kailua-Kona Member No.: 121 Region Association: Northern California 
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Putting a stiffer spring in the relief valve won't help your idle pressure. It may, if you're lucky, raise the pressure at high RPMs. If your pressure goes up to a certain point and then doesn't increase any more, it may move that point upward.
But that's not your problem. You either have a very worn bottom-end of the motor, or something is wrong with your oil circuit. This sounds a lot like what happens when the oil pressure plunger sticks inside its bore. You can take the relief valve out and make sure the bore is smooth and doesn't have any burrs for the plunger to hang up on. --DD |
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| purple |
Apr 1 2008, 10:25 AM
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#3
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Pigeon feeders attract me Group: Members Posts: 938 Joined: 24-July 07 From: Houston, TX Member No.: 7,942 Region Association: None |
What kind of crankcase venting do you have?
I ask because if the venting is plugged up, wont the seals leak like crazy? I think what you're suggesting works in automatic transmissions for the shift control solenoids, but i dont know about that with engine oil pressure. Methinks the problem lies elsewhere. Have you pulled your strainer to see what's in there? |
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| pete914 |
Apr 1 2008, 10:57 AM
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#4
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Member Group: Members Posts: 178 Joined: 21-August 07 From: east coast Member No.: 8,025 |
no, i haven't pulled the strainer because i have the additional oil cooler which prevents that....so, I might take that off when i get under the car and do the seals.
Okay, so i should remove the plunger to check if it's sticking? sounds plausible. Any other thoughts? are there any other symptoms to a worn bottom end? Car sure seems to run pretty strong if some of the engine components are failing. I'm venting throught the vent on the oil filler housing only right now. People have suggested venting the valve covers...but if the factory didn't do it why would they need to be there? Does running carbs affect this? I can't see why it would... Appreciate the feedback guys |
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| purple |
Apr 1 2008, 01:16 PM
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#5
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Pigeon feeders attract me Group: Members Posts: 938 Joined: 24-July 07 From: Houston, TX Member No.: 7,942 Region Association: None |
QUOTE(pete914 @ Apr 1 2008, 11:57 AM)  no, i haven't pulled the strainer because i have the additional oil cooler which prevents that....so, I might take that off when i get under the car and do the seals. Okay, so i should remove the plunger to check if it's sticking? sounds plausible. Any other thoughts? are there any other symptoms to a worn bottom end? Car sure seems to run pretty strong if some of the engine components are failing. I'm venting throught the vent on the oil filler housing only right now. People have suggested venting the valve covers...but if the factory didn't do it why would they need to be there? Does running carbs affect this? I can't see why it would... Appreciate the feedback guys I have half a mind to tell you to knock off the oil cooler and see what happens... IF you have a problem, go back to stock and work from there? |
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| Mark Henry |
Apr 1 2008, 01:23 PM
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#6
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that's what I do! Group: Members Posts: 20,065 Joined: 27-December 02 From: Port Hope, Ontario Member No.: 26 Region Association: Canada |
QUOTE(purple @ Apr 1 2008, 03:16 PM) I have half a mind.... Man that sucks...what happened to the other half (IMG:style_emoticons/default/biggrin.gif) (IMG:style_emoticons/default/happy11.gif) (I always chuckle when I hear that...not picking on you) |
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| Cap'n Krusty |
Apr 1 2008, 02:17 PM
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#7
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Cap'n Krusty Group: Members Posts: 10,794 Joined: 24-June 04 From: Santa Maria, CA Member No.: 2,246 Region Association: Central California |
I'm venting through the vent on the oil filler housing only right now. People have suggested venting the valve covers...but if the factory didn't do it why would they need to be there? Does running carbs affect this? I can't see why it would... Appreciate the feedback guys [/quote] Yes, running carbs generally requires venting the valve covers (or continuing to use the existing vents on the '73 (1.7 & 2.0) and '74 (2.0 only) engines). A lot more air going into the engine. The Cap'n |
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| purple |
Apr 1 2008, 02:33 PM
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#8
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Pigeon feeders attract me Group: Members Posts: 938 Joined: 24-July 07 From: Houston, TX Member No.: 7,942 Region Association: None |
[quote name='Cap'n Krusty' date='Apr 1 2008, 03:17 PM' post='1015681']
I'm venting through the vent on the oil filler housing only right now. People have suggested venting the valve covers...but if the factory didn't do it why would they need to be there? Does running carbs affect this? I can't see why it would... Appreciate the feedback guys [/quote] Yes, running carbs generally requires venting the valve covers (or continuing to use the existing vents on the '73 (1.7 & 2.0) and '74 (2.0 only) engines). A lot more air going into the engine. The Cap'n [/quote] Both the OP and myself have un-vented heads. Our contention is that the factory chose not to vent the heads for some reason, right? What about running carbs makes venting the heads worthwhile? |
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