Bob, I don't doubt your claim that the drips stopped. But, I asked the diesel tech at the service dept I use why use synthetics and the issue of higher oil pressures at lower temps and it's effect on RMS. He said there is only about 10 psi oil pressure at the rear main seal. Oil pressures are varied at different parts of the engine. He did not think that the higher pressures caused the RMS to leak.

 

Actually he is quite wrong about that. If you will look at the oil system graphic on page 21 of the PSD Bible, you will see that the mains are the first to receive oil and last and furthest point is the turbo and the oil pressure port. Nearly all engines have the mains getting their oil first since it is the part that carries the most load. The PSD has a seperate high pressure oil system for the injectors but the two are not linked.
I think I remember that Ford Cleveland engines oiled the cam bearings first so folks that hot rodded those engines had to put restrictors in the oil system to force enough oil pressure to the mains.

 

check the box on page 21 titled "Lubrication System Features". The second bullett states "There are no oil passages located on the outside of the crankcase. This reduces the chances for oil leaks." The rear main seal is part of the crancase. The main bearings are all internal. I don't see where that diagram shows a oil pressure port in the crankshaft at the rear main seal.

Anybody have a maintenance manual to look that up?

 

The mains are fed by oil passages in the block, Beside the last main on each end of the crankshaft there is a seal that holds the oil pressure on the main bearings. When these seals wear out or are overpowered by excessive oil pressure, they leak.

I worked as a mechanic in my younger days. I have built several race cars and a number of engines for friends race cars. Trust me, I know what I'm talking about.

 

Likewise.. I do know my way around a wrench. I have replaced more than one rear main seal. But, this 6.0 is a different breed of cat. I looked at a cutaway of a 6.0 at the Powerstroke Diesel demo trailer. This RMS is different. I understand what you are saying but I am looking for corroborating information.


I have been known to be wrong before.

 

Here is what the tech over at 6LITERPOWERSTROKE forum says:

"first i don't believe that switching to sysnthetic oil will stop an oil leak. the rear main seal will have low oil pressure on it whether it is 10 psi or not depends on the temp and the condition of the engine and oil."

"the crankshaft is lubed by the low pressure system. any oil that is supplied to the rear bearing will be on the seal. there is a small gap beetween the journal and the bearing that is filled with oil. it has a constant supply from the low pressure oil system so any oil that is sent to the rear main will pass though the gap and onto the seal."

So that doesn't settle anything does it? I believe your drip stopped when you went to synthetic, but my own opinion is that it wasn't the root cause.

 

My friend, I strongly disagree. I have had several main seals blown when the oil pressure relief valve stuck and pressure exceeded the seals ability to hoild oil. I have seen bearings eroded by excessive pressure. You can find a hundred people to say the same thing and it doesn't change the facts. By the way, it is not because the oil is synthetic, it is because it is a 5W40 and has better low temperature flow characteristics that make the difference.

 

You and I have agreed on a lot on this forum. I have the hanging drip. No oil on the floor. Next oil change, I will try the Mobil 1 Truck & SUV and see if that cures the drip.

 

I have had 1 r seal and a gasket replaced so far and each has been about a week. Good luck


PSDboy

 

It should be just slightly moist. The SUV oil is cheap enough. You will really notice how much quieter the engine is.

 

Hello,

I noticed some oil that was *slowly* (as in dust had accumulated on the leak) at the top of the "oil pan". I noticed this as I was changing my oil.

I've never had a leak on the ground before. I have an appointment to get the truck looked at on Monday, but you have to wonder what's causing the oil to be on the outside of oil pan, left side.

 

A week for a rear main seal replacement? I would be having a conversation with the service manager. My dealer service did it in less than a day!

 

To the leak ques. . I have had four replaced so far to this date. i have a early "03" they replaced the rearengine cover on the fourth attempt. Now its been in the shop for almost 4 weeks well this comign tuesday will be 4 weeks.. They say they are pulling motor and a delay on a tool to pull it. From what they just told me a few minutes ago on the phone they have to have the engine out to diagnois it.. Serviec advisor told me mechanic is looking to try to get a new engine to put in. Canot identify the prob so far ! I say replace truck or money back, we will see how that goes. hoping for full payback but i think im going to have to see a lawer for that. If any one knows how to make them buge on the replacement or by back can u pls. give me some answers im plain lost atm. tried everything . ty and have a great day

 

When they replaced mine it was 2 days, at the shop . and by the way check the trans fluid when you get it back mine was 1 quart low.

 

jdadamsjr on this forum got a new truck from them. He would be the best one to ask. The lemon law is different depending on the state. Ride 'em hard and document everything said. The smallest detail may be important. Let us know how it goes.