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.

 

[certified22]

Mine been doing same thing for over three years now with low enough oil pressure at idle i unplugged the sending unit so i didn’t have to listen to the dam thing bing bing at me you damaged a lifter or spin a cam bearing when you was reving it up when it was cold for sure I did same thing always let your vehicle warm up on its own but don’t worry to much cause these motors are tough as nails and it will run a very long time on little and no oil pressure like I said mine done the exact same thing yours is after I revved it up to warm it up fast one cold morning that was over three years ago and I replaced every single thing you can think of with no change in pressure main bearings rod bearings pickup tube o ring times 2 pick up tube oil pump timing set oil pressure switch times 3 tried three different brands there is no filter under the switch but I like you didn’t know bought one of those too still got it cause they will sell it to you at the parts store I put a manual gage on it and it read same low oil pressure as the factory gage ended up meeting a guy who did same thing we did with same issues after and he had damaged lifter and spun can bearing

 

[Rocket Man]

Mine been doing same thing for over three years now with low enough oil pressure at idle i unplugged the sending unit so i didn’t have to listen to the dam thing bing bing at me you damaged a lifter or spin a cam bearing when you was reving it up when it was cold for sure I did same thing always let your vehicle warm up on its own but don’t worry to much cause these motors are tough as nails and it will run a very long time on little and no oil pressure like I said mine done the exact same thing yours is after I revved it up to warm it up fast one cold morning that was over three years ago and I replaced every single thing you can think of with no change in pressure main bearings rod bearings pickup tube o ring times 2 pick up tube oil pump timing set oil pressure switch times 3 tried three different brands there is no filter under the switch but I like you didn’t know bought one of those too still got it cause they will sell it to you at the parts store I put a manual gage on it and it read same low oil pressure as the factory gage ended up meeting a guy who did same thing we did with same issues after and he had damaged lifter and spun can bearing

That’s the longest run-on sentence I’ve ever read.

 

[Fless]

It's not complete yet, @Rocket Man; there's no period. It could go on some more...

 

[Rocket Man]

It's not complete yet, @Rocket Man; there's no period. It could go on some more...

Oh yeah he had to take a breath lmao.

 

[SnowDrifter]

What's with all the spun cam bearing stuff I've seen lately?

 

[malmed]

There was no oil pressure on the bottom end. We already knew there was not on the top, but we really kinda expected the bottom end to be ok... So, interesting, but what does it mean?
The builder is thinking I originally spun a cam bearing, and lost pressure, and when it got worse it was because the bearing actually came out of the hole and there is a big open void causing even more pressure loss (the bottom end loss too).
We won't know until the teardown, but the motor comes out this weekend....

 

[SlimJim]

Sure, link me to it, I guess a new oil pump is in order, I have watched a couple YT vids on it, seems easy enough, hard part is harmonic balances, and if I break the damn bolt.... and the screw for the pickup tube, I guess fishing line and a magnet are the answer there.... While I have her apart, I guess new water pump, lower hose, and what else? Timing chain seems a waste to change as they rarely go bad....

Did you figure this out? im having a similar issue.

 

[malmed]

Yes, motor is now apart, she spun #2 cam bearing.... total rebuild in the works, line bore cam bearings, bore .020 over.... I will report more once we get the bottom end apart to know what shape the mains are in... but it looks like all that was wrong was the cam bearing....

 

[malmed]

Mains were fine, just a cam bearing.... I won't report back for a while, go on vacation next weekend for 2 weeks, but when I get back, he oughta have it all done...

 

[SnowDrifter]

line bore cam bearings,

Good man. I'm convinced a majority of rebuilt engine failures are from lack of line boring