Hi there. We have been working on a 2005 E-450 bus. This obviously has the remote mounted oil filter. Recently replaced the short block, and wouldn't build low pressure oil on initial start up. Once over filled with oil and oil filter removed, it would build low oil pressure. Drain out excess oil and reinstall oil filter, it took off and ran. It ran about 1,000 miles great. Three days ago, they pulled into a parking lot, shut it off for 15 min. and it would not restart. Towed it back to our shop and started looking at it again. Would not build low pressure oil again. Over filled the crank case and tried it. Would not pick up prime. Then pulled oil filter, with crank case still over full, cranked it over. after about 30 sec. of cranking, oil filter housing finally spit oil out. So this is where I am lost. Not sure what would cause the issue of it loosing its prime, I guess you'd say. Any help would be greatly appreciated!

Thanks
Jay

 

Oil really shouldn't be coming out of that without a filter in there. There is a button that is depressed inside there when the filter is put in place to allow oil in. What brand oil filter is being used? Why was the short block replaced? Where did this "new" shortblock come from?

 

The motors in the vans and busses have a remote filter that sits on the drivers side down low like a chevy V8 so filter is not the problem. http://www.backglass.org/duncan/ps60...l/ps60_023.jpg check out this link, it is probably the Oring on the pickup tube letting air in and loosing the prime, so when you overfill it is up to that oring and pulls in oil instead of air. Hope this helps.

 

Alright, yeah we are using a wix filter but cant get a Ford OEM replacement till monday morn. That was our next step and see what happened. The short block was replaced due to a turned exhaust lifter on #3 and wiped out cam and valves hit piston. This was the original engine and had about 168,000 on it. The "new" short block came from a garage in Howell, MI that does alot of 6.0l work. It had a little over 120,000 on it, but had a bad head gasket. The truck owner went ahead and replaced it with a Cummins. So we pretty much bought a long block and only used block and rotating assembly.

We have already checked the o-ring on the pick-up tube and it was fine. That is what we orignally had thought it was.

When it first looses low oil pressure, when the filter is dropped, the canister is still full. But when it is cranked over, it takes almost a miniute or more sometimes, but it will act like it finally got suction and spit oil out, a pretty steady stream. After it does that, with filter back installed, cranked a bit, it will take off and run like a charm. Almost acts as if it was vapor locked???? Not sure if that is even possible?

Thanks!

 

Did you replace the low presure oil pump before you put it in the bus, I saw something like this at a buddys shop, he had a 6.0 in an ambulance that had a lifter fail and one of the small needle bearings in the lifter got into the low presure oil pump and it would not put out enough psi and it would loose prime, remember that the oil goes through the pump before it gets to the filter so all that metal from the wiped cam got to the oil pump before it was filtered, it could also clog the oil cooler which could be another problem.
Mike, this does not use the same type filter as our trucks, it uses a spin on filter, the wix filter is fine for this aplication, it does not have the oilfilter housing on top of oil cooler like we are used to

You should be able to pull oil pump out with engine still installed, it sits right behind the Damper and a cover plate..

 

Bob - I knew that too, and he even stated that right in the first post but my mind was on a different level than my fingers typing on the keyboard haha

LPOP would be the first place I look too right now.

Do you have access to put this thing on a scanner and monitor a few things?

 

Alright, thats sounds fine. We do have a Snap-on MODIS, so we can watch some things. The bus is back with the customer for now, but we are pretty sure it will be back. We will check on the LPOP. Thanks for the help!! I will keep you guys updated as I find out more. Thanks again.

Jay