6v92t not building oil pressure

[brettpearson67]

It's crazy!

[luvrbus]

Does that engine have Thermatic oil filter housing or the standard by pass, the Thematic has a large nut {valve) in the center  they stopped using those in 1988 but some are still around

[brettpearson67]

Does that engine have Thermatic oil filter housing or the standard by pass, the Thematic has a large nut {valve) in the center  they stopped using those in 1988 but some are still around

Honestly, I have no idea. I was focused on removing the old filter and installing the new, while making myself flatter than I thought possible. I'll take a look at it when I get it back to the house next week.

[chessie4905]

"Whatever you did, it worked in the end" Hopefully this doesn't repeat in the future.

[brettpearson67]

From your lips.....

[brettpearson67]

I got the bus home!

Picked it up in Valdosta GA this morning. Got about 65 miles north on I75 and I noticed that the oil pressure had gone to just below 50 psi(was at about 55 for most of the 65 miles) and then we lost oil pressure and she shut down.
Was able to get in off the highway onto an off ramp.

We installed a new oil filter and we were on our way again!:) Oil pressure stable at just under 60 psi for the next 3 hours, then it sorta spiked to about 72 for an hour. We got to within about five miles of my house when the pressure dropped to just below 50 psi again.
Wasn't sure we'd make it, but we did.

I had it at high idle for the past 30 minutes or so, and pressure was about 40ish, seems to be holding.

Thoughts?

Thanks:)

[daddysgirl]

Do you have any thoughts on the coolant in the pan?
What causes sudden lack of OP and coolant in the pan? (I'm thinking "out loud" here)

[brettpearson67]

Do you have any thoughts on the coolant in the pan?
What causes sudden lack of OP and coolant in the pan? (I'm thinking "out loud" here)

I don't know that one has to do with the other, but it certainly could.

For some reason the oil filters are getting clogged very quickly and causing the loss of oil pressure.

The likely cause of the coolant is probably the liner seals. I'll have to drop the pan and pressurize the system and see if I can spot the leak into the pan.

[Jim Blackwood]

If it's picking up coolant and emulsifying it with the oil and then clogging the filter with the result, you'd better not run it any more until you get the coolant problem sorted out. Antifreeze can be death to main and rod bearings.

Jim

[daddysgirl]

I don't know that one has to do with the other, but it certainly could.

For some reason the oil filters are getting clogged very quickly and causing the loss of oil pressure.

The likely cause of the coolant is probably the liner seals. I'll have to drop the pan and pressurize the system and see if I can spot the leak into the pan.

Has the by pass valve failed?...What about the gauge or pressure switch if the pressure is fluctuating...
I'm not trying to hit you with too many things at once, just typing out loud so you'll have a record of everything easy to check.

[brettpearson67]

If it's picking up coolant and emulsifying it with the oil and then clogging the filter with the result, you'd better not run it any more until you get the coolant problem sorted out. Antifreeze can be death to main and rod bearings.

Jim

Yes, I am going to drop the pan pressurize the coolant system, and see if I can determine the source of the coolant. It was just a few drops in the bottom of the pan, but obviously that is something that needs to be addressed immediately. Now that I have it home, I can get to it.

[brettpearson67]

Has the by pass valve failed?...What about the gauge or pressure switch if the pressure is fluctuating...
I'm not trying to hit you with too many things at once, just typing out loud so you'll have a record of everything easy to check.

If you are referring to the oil bypass valve in the pan, I just replaced that, along with the oil pressure regulator valve, and the pickup tube.

I am wondering now, though, could it be possible that the  lines to the filter are plumbed backwards? The reason I ask is that the bypass valves in the filters are not working, it seems. If the filters get clogged, should that valve not open up?

[bigred]

Just a goofy thought and I don't even know if it apply's or not but oil filters have a anti drain back valve  that keeps the oil from backing down from the engine.Jap filters used to be bad to stick open and when you let your Jap Trap set over night and then fired it up the next morning ,the engine would dry start and for a few seconds it would knock like a thrashing machine.Is it possible that this valve could malfunction the other way and refuse to let oil through??? 

[luvrbus]

I don't know that one has to do with the other, but it certainly could.

For some reason the oil filters are getting clogged very quickly and causing the loss of oil pressure.

The likely cause of the coolant is probably the liner seals. I'll have to drop the pan and pressurize the system and see if I can spot the leak into the pan.

Just pull the inspection covers there is no need to drop the pan to see if it is a liner leaking the water jacket is above the inspection covers

[brettpearson67]

Just pull the inspection covers there is no need to drop the pan to see if it is a liner leaking the water jacket is above the inspection covers

I didn't know that. Thanks!
That sure will save a lot of time and effort.