Well after coming back from a trip, 2.5Hrs one way, and then sat for 4 hrs.

I decided to take the dog out for a ride, oil pressure was fine, and all of a sudden it went to nothing.

I pulled right over, turned it off, and then let it sit for 5 min as I was looking for oil leaking etc.

Got back in started it, and no oil pressure.

It is time for a oil change, but I figured that cant throw the oil pressure to 0, I checked the oil level its fine.

Is it the oil pressure sending unit or pump?

Truck is a 01 LB7 with about 93K on it.

Let's assume its an 02, not an 07.):h

Did it give you a warning on the DIC? I would more likely think it is a sensor or cluster (gauge) problem. I'm assuming no weird noises? I think a Predator or a Tech 2 can show the senders signal. A mechanical gauge would be a way to check also. Hopefully its no more serious then the sender. Where are you located? Maybe theres a member in the area that can help.

I am located around Chatt, TN.

I assume DIC, is the in dash message board? If so, it didnt give the warning till I stopped, and restarted it.

oh and it is actually a 01 I edited the post.

DBrown2, Ditto with Rick. If there is no abnormal noises, bet on the sender or guage. Check the wire connections under the hood. Guage going to 0 immediately and no OIL light on the DIC, I don't think its much to worry about. How long did you drive it after the guage went to zero? Obviously it got you home....

Thanks guys for responding so quick.

What is the DIC?

Oh and can you tell me where to check the wires at?

Excuss me lack of knowledge, but I am a Yota, guy and this is out of league till I get more familiar with it.

The DIC on the 01 & 02 is the square illuminated panel on the instrument cluster that has the Red battery image when you start the truck. It should turn yellow and give a "low oil pressure". I'll go outside and look under my truck now and see if I can locate the sender/wire harness.

sweet deal man...

Ya that is what I thought the DIC was...

Also have you had any work at all done to the truck recently? Anything at all?

I just went out to look for the sender unit. No joy. I got irrigation and can't get to the barn with the creeper and the light :mad:

Send a note to Killerbee, he may have an idea, since oil is his bag. Or send a note to Dmaxallitech, he can point you in the right direction! :ro)

No work at all just a hand warsh I gave it.

No underhood cleaning either.

Does the needle move at all with rpm change?

I wouldn't drive it till you know what the problem is.

The needle, when off rises a little, then when you turn the key, it goes to 0.

It is at the shop right now. Hoping for a Oil Pressure sending unit.

So we will see, if that doesnt do it. Then it is off, to the Stealer I guess.

Well guys... here is the deal.

They replaced the oil pressure sending unit, and that didnt fix it.

Well it was time for the oil change, so I had told him to change that as well.

When they pulled the filter, it was trying to come apart, the inside had pulled up thru and clogged the filter.

Oh, and it was a Pennzoil Filter 45, and not a AC like I told them to put on.

A new AC filter was installed, and all seems well with the world

Luckily I found the receipt and in fact the last oil change was done at a local quick lube, who I know the owner personally.

He said if something happens he will replace the motor etc. He then offered to pay for the sending unit etc.

Now what is the odds, some got pulled on thru???

When they pulled the filter, it was trying to come apart, the inside had pulled up thru and clogged the filter.

Oh, and it was a Pennzoil Filter 45,


any pics of the filter (keep it, your only proof)?

Here's the deal. The 01 and 02 filter housing is underprotected. It does not have the low pressure bypass the newer units do. I will make a guess right now that they put the wrong filter on. One without the built in bypass. Find the specs from the mfr on the 45, see if it is spec'd with a MPB, medium pressure bypass. You are looking for 14-16 psi.

You have replaced the filter and the sending unit, still no pressure. I say you have clogged passages, perhaps in the copper plate cooler, perhaps the uptake screen on the pump pickup. At this point, I think you need to take of the oil pan for a looksee.

Killerbee, no I do have pressure now. It was the filter, causing the problem. Not a bad sending unit.

I may have been unclear in the other post

They did pull the pan, and didnt find anything, in the pan that would be alarming. and yes I did take a pic of the filter.

Plus I called my buddy the quick lube owner, to make him aware incase his employee tried to hide something.

excellent!

Now get the right filter, and make sure it has the bypass.

We flow some serious numbers, the filter can't handle it all, and will collapse the center perforated can of non-bypass type filters. 03 and on do not have to worry, there is a bypass for the filter in the housing.

Glad it worked out!

This may not be a good as it sounds.... Once the Oil Pressure went to 0, how many miles did you put on it? What did the temps do?

I drove 1.8 miles to home, then .3 miles to the shop.

The temp going home didnt get above 205, and the trip to the shop. It never warmed up.

There is a 60 psi cooler bypass, that should have provided some flow, however small, may have protected you.

You can do me a favor, find out if that (old) filter has the bypass. Your fellow LB7'ers will benefit greatly from knowing. Also what are your local temps and what weight oil? Did it collapse after some miles (loaded up), or right away?

I will try and check Pennzoils site for the 45 and see. On the Bypass.

It had, just under 3K on it.

I dont run mine hard, but this weekend I did clean the dirt out of the pipes.

Which later that day resulted filter failure.

According to the dating they give you at the oil change place, I should have changed it Sunday as well.

I already checked, it's not on the site

Well guys according the Pennzoil site, the PZ-45 is for the 6.5 Diesel 2000 model.

The PZ-59 is for the 6.6 2001 Model.

So now if something does happen its my buddies(Quick Lube) fault for sure.

I saw that. Obviously the gasket and threads are the same.

Bypass?

Not a lot of miles on an engine with very limited oil flow. No slam intended, but monitoring the oil guage isn't high priority for most of us. Kinda an after thought. I would be concerned that you didn't notice the guage was 0 for an extended time. Keep a very close eye and ear on the engines' behavior for the next several weeks. And try and get the old filter back in your hands and do not loose the reciept for the oil change and the service call. Buddies and get to be ex-buddies if it costs them a ton of money.....

True, I hear ya.... On the buddy thing.

You just cant ever tell. Well if this buddy stiffs, me I have alot of leverage, outside of this, that will hurt him worse in the short and long term.

Alright guys since it obviously has been awhile on the oil pressure reading right, since the filter was wrong what should it read, and look light.

Mine now after a new AC filter, and Sending unit.

When I turn key it goes to 0, then I start it runs up to 50. When I drive its like 70.

When I turn it off, it drops to 40.

The only thing I think is backwards, is I thought when I just turn the key instead of going to 0 it should go to 40

boy.....dbrown2 mine does the same thing....i think thats the way it should be.

Alright guys since it obviously has been awhile on the oil pressure reading right, since the filter was wrong what should it read, and look light.

Mine now after a new AC filter, and Sending unit.

When I turn key it goes to 0, then I start it runs up to 50. When I drive its like 70.

When I turn it off, it drops to 40.

The only thing I think is backwards, is I thought when I just turn the key instead of going to 0 it should go to 40

Same here. Good Luck

im going with a sensor is gone.

I saw that. Obviously the gasket and threads are the same.

Bypass?PZ-45 has an 8-10 lb bypass going from my cross to donaldson

There is a 60 psi cooler bypass, that should have provided some flow, however small, may have protected you.

You can do me a favor, find out if that (old) filter has the bypass. Your fellow LB7'ers will benefit greatly from knowing. Also what are your local temps and what weight oil? Did it collapse after some miles (loaded up), or right away?cooler bp is down stream of the filter

cooler bp is down stream of the filter

but it bypasses the element if the element collapses, correct? about 60 psi?

you got me thinking again

but it bypasses the element if the element collapses, correct? about 60 psi?

you got me thinking againno the cooler bp is down stream of the filter. the flow goes like this:

pickup to pump

pump to filter housing inlet

filter housing inlet to filter in ( at this point it can bypass the element by way of the filter BP)

filter or filter BP to cooler (at this poin the flow can bypass the cooler via the cooler bp)

cooler or cooler BP to outlet of the filter housing

filter housing outlet to oil / cooling system of the motor

Hope this helps

:help2: :help:
Can anyone tell me how you start a new thread? I'm new as you can see.:offtopic:

Sure. PM me and I'll tell you :) not much tougher than using smilies.

Thanks Geabis, I will take a closer look at the housing. This does explain a conflict I had in my head, about the filter collapse from last week.

DBrown2, please look at the pic in this post (http://www.dieselplace.com/forum/showpost.php?p=1081093&postcount=77).

Which housing do you have? Left or right?

:help2: :help:
Can anyone tell me how you start a new thread? I'm new as you can see.:offtopic:

First go to the forum you want to start the thread in. Then look for a button in the upper left area of the page that says new thread. Click it and the rest is easy. PM me if you need more help with this.:)

Oil Pressure eh. Well Ive owned many Gm Products in my day, and have had some problems with them concerning oil pressure.. just from my experience if the gauge dropped and you got no warning (beeping or a light) the gauge has burnt out and you have to replace the WHOLE cluster Grr i hated that 400 bux later.. anyways.. when i owned a coach with a 8v92 2 Stroke Detroit Diesel with DDec 2 my oil pressure regulator down line from the pump crapped out and cost me my engine... the 50 series i have now in my volvo truck, my oil pump gear teeth had shredded and tore up my piston counterweight shaft gears too. PISSED me off but anyways.. good luck and hope it aint serious. heh