Oil pressure switch, screen?

[Rocket Man]

270,000View attachment 219241

That’s awesome!

 

[malmed]

Well, I have found a guy near me, that all he does is rebuild chevy motors... He will bore it out .020" (likely due to mileage) and rebuild mine for $2,200. Turnkey, drop it off, pick it up done, and warranty.... I know a guy that has 20,000 on one he rebuilt and he is very happy.... Seems like THE way to go... A junkyard motor, put in would cost me $1,800 or so....

 

[Rocket Man]

Well, I have found a guy near me, that all he does is rebuild chevy motors... He will bore it out .020" (likely due to mileage) and rebuild mine for $2,200. Turnkey, drop it off, pick it up done, and warranty.... I know a guy that has 20,000 on one he rebuilt and he is very happy.... Seems like THE way to go... A junkyard motor, put in would cost me $1,800 or so....

That’s a great deal.

 

[BigPapa1959]

I have searched and can find no definite answer...
Does the 03 Denali 6.0 have a filter under the oil pressure sending unit....?

My oil pressure has been fine, idle at 40 psi, 60 psi under acceleration.
One day about a week ago, suddenly oil pressure down to 10 psi idle and 20 under acceleration.
If I dont keep the idle up, she bing bing bings me, low oil pressure warning.

Now, I really don't believe the oil pressure is low, no indications at all... seems fine, except the warnings....
So, I just figured 200,000 miles, oil pressure sending unit...
Swapped it for a new one today...
NO change at all.

I run an AC Delco oil filter and Mobil 1 10w30.

My son says on his 07 truck, he changed his AC Delco and the oil pressure went back up to normal...?
I don't buy that, but, ?

So, I went and did an oil and filter change today, to a WIX synthetic filter... NO change.

All I can guess is there IS a filter under the oil pressure sending unit, and it is dirty... or my oil pump suddenly went bad, which really does not seem likely to me, slow progression I could see, overnight? no way....

****************************************************************
I had the same issue and i was worried i would have some expensive repairs up ahead........WRONG!
Thank God, all i did was change the oil, using
Royal Purple 5W-30 Synthetic Motor Oil
and
used the MOBIL oil filter.

Pressure problem gone!

Mike

 

[Musicars]

There are several threads addressing this issue including one from myself. If you look mine up from last year you can see when it started (i don't remember). I am still driving the truck with low oil pressure. It is slowly getting worse. I drove it all winter with Mobil 1 synthetic 0W - 40W and a small bottle of STP engine treatment. The warning bell stayed off all winter. It started again this spring with warmer weather. I changed the oil again but have not put in any additives and it has only triggered once since. I have a friend that races and he swears if I add a quart of gear lube it will help a lot. The Lucas would probably do the same. I have a lower mileage engine to pop in once the weather gets warmer. The point is that sometimes you can drive these for a while after the pressure drops.

Also, send an oil sample in to Blackstone labs. My results showed bearing material in the oil. I suspect a cam bearing issue. I even just sent in the oil from my replacement engine so I can hopefully avoid this again. My truck shows no other issues. No ticks, hardly any oil loss, nothing. I'm at a little over 180,000 miles.

On my old thread I have more detail of what I checked including a picture of an adapter I used to check oil pressure where the oil cooler lines connect. Good luck, I know how aggravating and time consuming this is.

 

[malmed]

Also, send an oil sample in to Blackstone labs. My results showed bearing material in the oil. I suspect a cam bearing issue. I even just sent in the oil from my replacement engine so I can hopefully avoid this again. My truck shows no other issues. No ticks, hardly any oil loss, nothing. I'm at a little over 180,000 miles.

I did keep driving mine for a week or so, til the pressure dropped more, alarms went off, and now I have one lifter ticking....
I am told that is a very good sign that a cam bearing has spun, one lifter is not getting oiled... So, I am now scared of really damaging it if I keep driving it.... But, it FEELS fine.

 

[malmed]

Also, mine dropped overnight from 40-60psi, to 10-20 psi... no slow drop, bam.

 

[Musicars]

Also, mine dropped overnight from 40-60psi, to 10-20 psi... no slow drop, bam.

Mine took a dive over just a few days. Probably 5 - 10 pounds a day from 40 pounds down to 10 or less depending on how warm the oil gets. Not really a sign of main bearings but more an indication of a cam. I have yet to get the ticking though. Very frustrating, great motors except for this pesky little almost no oil pressure thing. That alarm going off is maddening!

 

[malmed]

Mine is now at the engine rebuilder... $2,200 turn key job, bore, new pistons, align bore cam... seems like a bargain. He is also gonna replace any wore out front suspention parts while it is easy to get to them... I know my idle arm and pitman are wore out.

 

[Rocket Man]

Mine is now at the engine rebuilder... $2,200 turn key job, bore, new pistons, align bore cam... seems like a bargain. He is also gonna replace any wore out front suspention parts while it is easy to get to them... I know my idle arm and pitman are wore out.

That’s def a good deal.