Oil pressure switch, screen?

[malmed]

Thanks snow drifter, I will look closer at that, really didn't even notice....

 

[malmed]

My mechanic just finished putting in a new oil pump, and says no change, still very very low oil pressure... WTF, I am now $800 into this... New o ring, new pan gasket, new oil pump, filter, oil and sending unit... now I have a slight valve tick happening too (I assume from low oil up top).... What to do now?

 

[malmed]

IF it spun a bearing, wouldn't that happen slowly? Wouldn't it have reasonable oil pressure at startup and slowly decrease as it warmed up?

 

[malmed]

I have a friend that does LS swaps often... I called him and talked about my truck. I told him I replaced the O ring and the oil pump and still have no oil pressure, he said "spun a camshaft bearing". He said they are know for spinning the center bearing and they stick to the camshaft and spin in the hole... blocked oil passage and thats why I lost pressure... ? Sound like my problem?

 

[Tonyrodz]

I have a friend that does LS swaps often... I called him and talked about my truck. I told him I replaced the O ring and the oil pump and still have no oil pressure, he said "spun a camshaft bearing". He said they are know for spinning the center bearing and they stick to the camshaft and spin in the hole... blocked oil passage and thats why I lost pressure... ? Sound like my problem?

That would suck. I hope not.

 

[Rocket Man]

I have a friend that does LS swaps often... I called him and talked about my truck. I told him I replaced the O ring and the oil pump and still have no oil pressure, he said "spun a camshaft bearing". He said they are know for spinning the center bearing and they stick to the camshaft and spin in the hole... blocked oil passage and thats why I lost pressure... ? Sound like my problem?

I’m no expert but I do know that replacing cam bearings isn’t that hard, unlike main bearings. Sounds like you might be ready for a top end rebuild. Not the best news I guess but not the worst either. Good luck.

 

[SnowDrifter]

My mechanic just finished putting in a new oil pump, and says no change, still very very low oil pressure... WTF, I am now $800 into this... New o ring, new pan gasket, new oil pump, filter, oil and sending unit... now I have a slight valve tick happening too (I assume from low oil up top).... What to do now?

Is the o ring seated all the way? It's a bit of a common mistake. The retainer won't suck the pickup tube in. You need to lube it up and jam the thing in there, it'd a fairly tight fit.

Any chance he pulled bearing caps and inspected them while the pan was off?

Pickup tube cracked or damaged in any way?

You could also see if you can rig up some clear tubing of some sort from the oil cooler blockoff to check for any air ingestion. Mind it will be under 60ish psi, so plan for that accordingly

Barring that, I think you're looking into a teardown of the engine. Something internal ****** up. Pressure is a function of resistance and flow, with flow determined by the oil pump, and resistance largely based on both bearing tolerance and oil viscosity.

You could try tossing a bottle or 2 or of Lucas in there. Or swap out for some thicker oil. If you are having issues with the pickup, oil Pressure would go down as the thicker fluid would cause a greater suction, causing more air, causing less pressure. If it's a bearing issue of some sort, pressure would go up on account of an increased resistance to flow.

 

[malmed]

Well, this happened, bam, overnight, one days 40-60 psi, next day 10. The original O ring looked fine... so we went on and did the oil pump too... put it all back together, and no change... and a little metal in the pan... So bad as I hate to, I reckon it is long block time, $2700, and probably another $1000 to put it in.... I will try some lucas, and thicker oil, but, I ain't got much hope at this point...

 

[malmed]

We were really expecting a bad Oring.... but it really looked just fine, not brittle, no cracks....

 

[Kraig]

I agree with the cam bearing guess—Lucas or thicker oil aren’t going to help.

 

[Tonyrodz]

Well, this happened, bam, overnight, one days 40-60 psi, next day 10. The original O ring looked fine... so we went on and did the oil pump too... put it all back together, and no change... and a little metal in the pan... So bad as I hate to, I reckon it is long block time, $2700, and probably another $1000 to put it in.... I will try some lucas, and thicker oil, but, I ain't got much hope at this point...

That really sux, but look at the bright side--now you can cam it and maybe some long tubes. You know--while you're in there .

 

[SnowDrifter]

I will try some lucas, and thicker oil, but, I ain't got much hope at this point...

The lucas isn't intended to fix anything. Call it a last step before you start tearing down the motor looking for the failure point

 

[RST Dana]

Unless you have a way to true the cam bearing hole in question, AND then have a thicker cam bearing, then you will be looking for a new block if that’s the issue IMHO.

 

[malmed]

The lucas isn't intended to fix anything. Call it a last step before you start tearing down the motor looking for the failure point

Yes, I have used lucas with success on a wore out V6 2.8 chevy motor in my 1990 Isuzu Trooper, brought it up 10 psi, got me by a while... she was quitting at red lights due to low oil pressure....

 

[malmed]

Unless you have a way to true the cam bearing hole in question, AND then have a thicker cam bearing, then you will be looking for a new block if that’s the issue IMHO.

Yes, it would have to be totally tore down, and line bored with oversize bearings... I am thinking reman remanufactured long block is my best bet.... or just swap it with a junkyard engine, but the extra $1200 for a remanufactured seems like the better investment.

 

[SnowDrifter]

Yes, it would have to be totally tore down, and line bored with oversize bearings... I am thinking reman remanufactured long block is my best bet.... or just swap it with a junkyard engine, but the extra $1200 for a remanufactured seems like the better investment.

Depends on how long you plan to keep the rig TBH. It's all a cost value proposition

 

[malmed]

I still have my 1990 Trooper I bought in 1990.... Still runs... I'll keep her as long as she is ok.... The rest of her is in real good shape, never wrecked, never painted, so....

 

[Rocket Man]

I still have my 1990 Trooper I bought in 1990.... Still runs... I'll keep her as long as she is ok.... The rest of her is in real good shape, never wrecked, never painted, so....

How many miles on it?

 

[malmed]

270,000

 

[malmed]

190,000 on my Denali.