It's one of those things where there's a threaded hole for the second bolt.... But I imagine GM has saved millions of dollars leaving that one bolt out on all the lS engines they built, LOL. All the aftermarket pumps have the two threaded holes as well. I'm sure it came down to some pencil pusher interrogating an engineer as to if it could work with just one bolt! And they really thought we wouldn't notice? OMG
07 Denali oil pressure talk
- Thread starter ny_summit
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While GM has moved completely away from fiber gaskets, as pretty much everyone has.... If they are just designed it with a flange on the pickup tube to mate a flat surface on the pump, with a fiber gasket in between, it sure would have saved a lot of engines!
don't do this, same reason you don't double up on oil filter gaskets, 2 will leak
Charlie207
Full Access Member
I added one like that when I rebuilt my engine. There's already a drilled and tapped bolt hole there, unused. Might as well apply extra preventative protection.
I put one in my cart for future use.
I currently own 3 vehicles with LS engines.
SpareParts
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Apples to oranges comparison.
Doubleing up on a O ring in this situation Can't hurt.
Oil filter is a entirly different situation.
i disagree, here is why
a single o ring fills the void between the metal surfaces, sealing happens
since the o ring(s) being used are the wrong size they are not sealing between the metal surfaces as such the two o rings need to seal between themselves. The o ring to o ring connection will leak.
this is the same situation as dual filter gasket, leak will occur between the gasket/o ring connection
West 1
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I would agree in o rings under pressure, that is not the case in the pick up tube, in the pick up tube the O rings are there to fill a void and seal against air under vacuum. Many applications use double O rings in similar situations. I will report back after fire up. I assume it will work fine but time will certainly tell.
Never tried it, but off the top of my head I don't see a problem. The place it seals is between the pickup tube and the outer bore of the hole it slides into. The face of the o-ring isn't really compressed against anything. I'll have to measure the depth on an oil pump when I get home, in relation to the flange on the pickup tube. I'm thinking there's room without compressing the o-rings.... Which even if it did, could only help. I'll do some measurements with photos when I get home.
2 pieces of rubber like o rings seal very well against themselves under compression. the reason the double gasket oil filter leaks is not because of rubber to rubber seal, there's no support on the outside of the top gasket and pressure blows it out. if there was a metal support ring around the outside, it would he fine.
West 1
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Got it back together today, fired it up. Oil Pressure picked up instantly even though I did not prime the pump. At full temp for almost an. Hour Hot Oil pressure at idle is 40 psi, at 2500 it is 55 psi. No leaks so far so all is looking good. Prior to this OP at idle was dropping to 20 PSI. I know that is plenty at idle but I don’t like low Oil Pressure.,
In this application I have zero concern about the 2 Orings. If one fails the other is there as back up.
I know the suspension alert is on. I am working to bring this truck back to life. I have a new air pump to install and then figure out if it needs new shocks also. Replaced the rear lift gate actuator today, easy job and now the gate works as it should, also installed a new rear window button so it can be opened normally. More work to do but at least Oil Pressure is golden now.
In this application I have zero concern about the 2 Orings. If one fails the other is there as back up.
I know the suspension alert is on. I am working to bring this truck back to life. I have a new air pump to install and then figure out if it needs new shocks also. Replaced the rear lift gate actuator today, easy job and now the gate works as it should, also installed a new rear window button so it can be opened normally. More work to do but at least Oil Pressure is golden now.
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