No Oil Pressure in Need of Mechanic

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No Oil Pressure in Need of Mechanic

May 23, 2022, 07:41:31 pm

We got a new to us 94 U300 last fall. We have taken it out on a few trips successfully. On our most recent trip about 100 miles in the engine shut off on the freeway, it started again after pulling over but didn't have any oil pressure and the do not shift light was blinking on the transmission controls. The engine would turn itself off after briefly running. There is oil all over the engine and back of coach. We had it towed to a mechanic who just called and said because of all the auxiliary systems they can't figure out what the problem is. Does anyone know of a mechanic who will work on our coach in the Tri-Cities Washington area?

Any suggestion as to what the problem might be to help guide the mechanic?

Any help would be greatly appreciated. Thanks!

Also, is it possible sell a non-functional RV?

Re: No Oil Pressure in Need of Mechanic

Reply #1 – May 23, 2022, 07:56:53 pm

First off it would help us if we knew what kind of a engine it is. How much oil on the
dipstick. The only way I know how to find a leak is too clean up the engine and run the
engine to see where the oil is coming from. Don't restart engine till oil level is up on dipstick

Re: No Oil Pressure in Need of Mechanic

Reply #2 – May 23, 2022, 07:57:37 pm

Check to see if the oil is black or red. If black add engine oil and start to see what is leaking. Same with the trans if the fluid is red. I don't think the hyd. oil would shut off the engine. As far as selling a coach without making it drivable not an economically good idea.

Re: No Oil Pressure in Need of Mechanic

Reply #3 – May 23, 2022, 08:00:37 pm

Also a leak could be an easy fix. Had one last winter, had a hole in the oil filter.
A new filter 4 gallons of oil and I was good to go.

Re: No Oil Pressure in Need of Mechanic

Reply #4 – May 23, 2022, 08:01:09 pm

to soon to tell if it needs to be sold without proper diagnosis.. I would see what the oil level is now and if low add some to get it full. Block the wheels and start it and look around. If you have an oil cooler I would check the hoses and if not I would look around and see if a gasket had popped... Did it get hot at all? If no pressure could mean it has no way of building pressure as its getting out somewhere.

Re: No Oil Pressure in Need of Mechanic

Reply #5 – May 23, 2022, 08:06:33 pm

Quote from: oldguy – May 23, 2022, 07:56:53 pm

First off it would help us if we knew what kind of a engine it is. How much oil on the
dipstick. The only way I know how to find a leak is too clean up the engine and run the
engine to see where the oil is coming from. Don't restart engine till oil level is up on dipstick

Engine is a DD6V92TA. I am no longer near the coach to physically check things, but what I'm hearing so far is basic troubleshooting to find a leak is what's needed.

Engine was not hot during the shutdown. Everything seemed to be running perfectly until it wasn't.

Re: No Oil Pressure in Need of Mechanic

Reply #6 – May 23, 2022, 08:17:53 pm

Quote from: scrouch – May 23, 2022, 08:06:33 pm

Engine is a DD6V92TA. I am no longer near the coach to physically check things, but what I'm hearing so far is basic troubleshooting to find a leak is what's needed.

Engine was not hot during the shutdown. Everything seemed to be running perfectly until it wasn't.

I'm over in Walla Walla. Sent you a PM. Give me a shout and we will help as we can. Like a place to stay while you start the process of repair so you can be near(ish)

Re: No Oil Pressure in Need of Mechanic

Reply #7 – May 23, 2022, 08:25:14 pm

That engine will shut down from low oil pressure. Do not run it until you find the problem. Just a suggestion if you cannot find a Detroit Diesel facility that works on truck engine you could possibly find a Marine Diesel Mechanic. That engine was used extensively in large yachts, and is still in use today. Detroit Diesel Dealer, Repair & Service Provider | W.W. Williams

Re: No Oil Pressure in Need of Mechanic

Reply #8 – May 23, 2022, 08:26:37 pm

The mechanic who can't figure out where the oil is leaking from is not the guy you want.

Re: No Oil Pressure in Need of Mechanic

Reply #9 – May 23, 2022, 08:31:40 pm

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Re: No Oil Pressure in Need of Mechanic

Reply #10 – May 23, 2022, 09:04:25 pm

Check your hydraulic lines to the fans/hyd motor. Our were touching each other and got a huge leak.

Pierce

Re: No Oil Pressure in Need of Mechanic

Reply #11 – May 23, 2022, 09:08:41 pm

Maybe a bad oil filter. I would strongly suggest that you be with your coach and have a look at it and as has been suggested check the oil dipstick to see if it is low. Probably will be not showing anything on it. You will get pennies on the dollar if you try to sell it like it is.

Re: No Oil Pressure in Need of Mechanic

Reply #12 – May 24, 2022, 07:04:24 am

Quote from: scrouch – May 23, 2022, 08:06:33 pm

Engine is a DD6V92TA. I am no longer near the coach to physically check things, but what I'm hearing so far is basic troubleshooting to find a leak is what's needed.

Engine was not hot during the shutdown. Everything seemed to be running perfectly until it wasn't.

"Everything seemed to be running perfectly until it wasn't." Describes a normal day in my life.

Best thing to do when something like this happens, is to make a pot of coffee, set up a chair in front of the coach, and enjoy your coffee while watching the traffic go by. I mean it. Sudden engine failure, whether you recognize it or not is a great trigger for a brain freeze and you need time to process before you do anything. But that's all in the past now.

Your current mechanic didn't wash the engine? Run.

As others have said, you can't do anything until the oil pan is full. If it refuses to fill you probably lost the oil drain plug.

From the way you described the oil spray, if you're lucky, it's an oil hose. Others can tell you better than I, but is the oil return line from your turbo a hose?

As much as I eschew automation, that computer saved your engine for you.

Start with the obvious, simple, stuff first.

Re: No Oil Pressure in Need of Mechanic

Reply #13 – May 24, 2022, 10:11:50 am

An easy check is the engine oil level. If it's full, the problem is elsewhere. Broken hydraulic line should not cause the DDEC to go into shutdown for at least a couple of minutes until the water temperature goes up. I could be coolant you are seeing and once the level goes down below the sensor in the black tank, the engine will shut down. Transmission hose may have let go. With a little poking around, you should be able to see where it's coming from. Is the oil very black or lighter color. Not green is it?

Steel pan on the Detroit and unless it plug was not tightened, it won't come loose. Very hard to over torque. The engine maxes at about 60 psi oil pressure so should not have blown out the filter gasket.

Have you had any work done on the engine/trans lately? Oil change.

Pierce

Re: No Oil Pressure in Need of Mechanic

Reply #14 – May 24, 2022, 11:53:18 am

Quote from: Pierce & Gaylie Stewart – May 24, 2022, 10:11:50 am

An easy check is the engine oil level. If it's full, the problem is elsewhere. Broken hydraulic line should not cause the DDEC to go into shutdown for at least a couple of minutes until the water temperature goes up. I could be coolant you are seeing and once the level goes down below the sensor in the black tank, the engine will shut down. Transmission hose may have let go. With a little poking around, you should be able to see where it's coming from. Is the oil very black or lighter color. Not green is it?

Steel pan on the Detroit and unless it plug was not tightened, it won't come loose. Very hard to over torque. The engine maxes at about 60 psi oil pressure so should not have blown out the filter gasket.

Have you had any work done on the engine/trans lately? Oil change.

Pierce

The fluid was black. Have driven a few hundred miles since we had the oil changed and filters replaced. I will say the engine has been a pretty steady 80psi while driving.

Re: No Oil Pressure in Need of Mechanic

Reply #15 – May 24, 2022, 12:04:00 pm

You haven't said where the oil is on the dipstick. When there is an oil pressure issue that is
the first thing to check.

Re: No Oil Pressure in Need of Mechanic

Reply #16 – May 24, 2022, 12:49:12 pm

Quote from: oldguy – May 24, 2022, 12:04:00 pm

You haven't said where the oil is on the dipstick. When there is an oil pressure issue that is
the first thing to check.

The OP may not be speaking precisely, so let's take it on faith that he checked the oil, found it to be black in color and at the full mark. My first move would be to drain the oil, watching how it comes out, and then pull the oil pan for cleaning. While the oil pan is off I'd inspect the oil pick up tube and screen. Pierce can tell us where the oil pump is located.

BUT. The back of the coach is soaked in oil, so from whence it came? A professional mechanic would pressure wash the engine, disconnect the fuel shut off and crank the engine to "build oil pressure" then look to see where the drip is and follow it back to the source.

Re: No Oil Pressure in Need of Mechanic

Reply #17 – May 24, 2022, 01:37:04 pm

Sounds like your changing the oil anyway, pull filters to inspect for a split filter. Cut open filters to inspect contents. Look for big holes in pan and refill. Search for failed oil line
Scott

Re: No Oil Pressure in Need of Mechanic

Reply #18 – May 24, 2022, 01:47:12 pm

I've never heard of a Detroit with a failed oil pump. These engines are bullet proof. To look at the location of the pump behind the front cover, go to the great Wanderlodge site and download all the descriptions, diagrams, etc. at: https://www.wanderlodgeownersgroup.com/downloads/DETROIT%2092%20SERIES%20ENGINE%20SERVICE%20MANUAL/Sect%204%20-%20Lubrication%20System.pdf

The biggest reason the pump didn't fail is there is oil on the outside of the engine and no one has said if the crankcase is low or even what kind of oil or coolant it may be. So, just wild guesses until the owner enlightens us. How many times has this happened before?

I mean that if your engine would not start, you had oil on ground and in the engine compartment, wouldn't you take a good look to see where it was coming from, check the dipstick as the first thing on the list? Is it even engine oil?

Pierce

Re: No Oil Pressure in Need of Mechanic

Reply #19 – May 24, 2022, 01:50:15 pm

I am not near the coach any longer. I did not check the dipstick following the issue ( I now know to do this), and I was assuming I would be able to have a mechanic handle all this. I was scrambling to get the coach towed off the road and family a safe place to sleep.

When I was trying to find a place to get the coach towed the Detroit Diesel shop in the area declined to perform service because their cutoff model year date was 1995 and mine is a 94. Have any of you heard of this before?

Thank you all for the feedback and advice, it has been invaluable as I try to formulate a plan to move forward. I've been a bit thrown by the fact that the shop that said they could work on it is unable to. As I'm sure you towing a coach is not a cheap endeavor so I want to be completely certain before I make a next move.

My current thought is to have a mobile mechanic come take a look and if that fails to bring the coach back to life have it towed to a shop in my home area at great expense as I am unable to find a shop that will work on it in the area it broke down.

Re: No Oil Pressure in Need of Mechanic

Reply #20 – May 24, 2022, 01:59:24 pm

Quote from: scrouch – May 24, 2022, 01:50:15 pm

I am not near the coach any longer. I did not check the dipstick following the issue ( I now know to do this), and I was assuming I would be able to have a mechanic handle all this. I was scrambling to get the coach towed off the road and family a safe place to sleep.

When I was trying to find a place to get the coach towed the Detroit Diesel shop in the area declined to perform service because their cutoff model year date was 1995 and mine is a 94. Have any of you heard of this before?

Thank you all for the feedback and advice, it has been invaluable as I try to formulate a plan to move forward. I've been a bit thrown by the fact that the shop that said they could work on it is unable to. As I'm sure you towing a coach is not a cheap endeavor so I want to be completely certain before I make a next move.

My current thought is to have a mobile mechanic come take a look and if that fails to bring the coach back to life have it towed to a shop in my home area at great expense as I am unable to find a shop that will work on it in the area it broke down.

A general mobile mechanic is a good choice. He does not have to be an expert to see where the oil is coming from. Nice if he has big rig experience.

Pierce

Re: No Oil Pressure in Need of Mechanic

Reply #21 – May 24, 2022, 02:46:01 pm

Quote from: scrouch – May 24, 2022, 11:53:18 am

The fluid was black. Have driven a few hundred miles since we had the oil changed and filters replaced. I will say the engine has been a pretty steady 80psi while driving.

It sounds like you may have been leaking oil for those few 100 miles. Hopefully it's as simple as one of the old filter's O-rings didn't come off and a new filter was installed over it. That could explain your problem.

Re: No Oil Pressure in Need of Mechanic

Reply #22 – May 24, 2022, 02:54:13 pm

Once you get the mechanic out to your coach, raise the dash top and put something in place to keep it open. If you look at the back wall inside the dash top, you will find two switches. One will be for the engine and one for the transmission. With the key on, push the engine switch to the on position and count the sequence of flashes the little bulb (you will see it when it flashes) and compare it to the chart here. Table 2-16. DDEC II System Fault Index or Detroit Diesel Engines Fault Codes List online | Truckmanualshub.com If the low oil pressure code comes up, you know you have a leak and the DDEC saved you $30,000.

If you have not had the dash top up before, it may take some effort so good to have someone on both sides. It won't break, just lift.

Pierce

Re: No Oil Pressure in Need of Mechanic

Reply #23 – May 24, 2022, 02:54:21 pm

I put a call into the truck shop I use as per their willingness to work on the V6. should that be needed (hopefully not) I'll post up their reply.

Just a suggestion for the future. Call Coach-net and spend the $200 on a towing policy.

Re: No Oil Pressure in Need of Mechanic

Reply #24 – May 24, 2022, 04:15:06 pm

If the DDEC shut the engine down, a warning light came on but because of the poor design, the steering wheel rim is right in the way of the row of lights including the warning light. I'm 5' 10" and never have been able to adjust the steering wheel to where I'm happy with it. Both times the hydraulic belt failed right after we bought it and on our way home across the U.S. I didn't see it and the first warning was the DDEC going into half power for 30 seconds before it shut completely down.

Pierce

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