Oil coming out of oil fill tube
 

We have a 30' truck with a rebuilt engine-about 2500 miles on the rebuild.
At higher rpm's or greater speed, oil is thrown out of the oil fill tube and all over the side of the engine. Is it possible the tabs inside the tube are not oriented in the right direction for engine rotation?? At speed above 50mph, it really tosses oil out. Any ideas or suggestions??

Thanks!!

Re: Oil coming out of oil fill tube
 

Get a copper pad that is used for scrubbing, cut a small piece and insert it in the tube below the breather cap. This permits the engine to breath, oil blow by collects on the pad and returns to the engine pan. I have used this method on all three of my A,s to keep the engine and fire wall free of oil blow by. It really works !!!!

Ron

Re: Oil coming out of oil fill tube
 

Piston rings worn or stuck.
Fix the excessive blowby if you want to actually fix the problem rather than the symptom.
Try a leakdown test, listen through the filler for air hissing into the crankcase.
It may be only one cyl, usually #4, scored or rings seized in lands from an overheat event.
http://i233.photobucket.com/albums/e...A/DSCF0200.jpg

Re: Oil coming out of oil fill tube
 

The engine oil level could be too high --over the dipper tray, i over filled my smiths compresser-- I watched it spew, then it stopped ---when the oil level got a little below the "F" ----try not filling the oil and watch the level

It could also be there is a ring seating problem, and there were several styles of oil filler/baffles trying to minimize wet oil ---what do you consider "high speed", if you are not concerned with total original the larger "B" breater could help

Re: Oil coming out of oil fill tube
 

I put an extension on mine & solved the problem . had a muffler shop make me a piece that swedged on & sealed the joint ........... steve

Re: Oil coming out of oil fill tube
 

ford tried 3 or 4 times to correct that problem by rearranging the baffles in the oil fill pipe, they never really did correct it and gave up, you can buy an accessory oil breather from sacramento vintage ford, and others I think, it clamps to the oil filler tube, it has a spring loaded top so you can add oil and has a flexible tube that runs down the side of the engine and exits under car, letting the oil drip out there instead of in the engine compartment, not a cure but a fix that works, expensive, around $40

Re: Oil coming out of oil fill tube
 

i'd do a compression check. If all of the readings are low, its possible the new rings havent seated fully yet. If only one is low, compared to the others, a ring may have been damaged during installation. As MikeK says, the real problem is blowby. You can fix it or you can put on the filler with the road draft tube and live with it. If its only one cylinder, I'd fix it now. If all of them are low, drive it awhile and it may fix itself, if its just a break-in problem.
Good Luck!

Re: Oil coming out of oil fill tube
 

Misting oil out the filler is fairly NORMAL. Some put sock over it for "high speed" running.
Bill W.

Re: Oil coming out of oil fill tube
 

Hi Bob,

With the comment: " it really tosses oil out."

In my humble opinion, with a "rebuilt" engine, it is either:

1. An abnormal "internal" problem; or,

2. An oil filler tube problem, (part no. A-6763 sold today by parts vendors) that is "not" Ford's "later modified" version.

At 65 mph, my current "rebuilt " engine, (with about 1,100 miles), will not even through out an oil mist.

My other "rebuilt" coupe engine with about 10,000 miles will not even throw out an oil mist.

Re: Oil coming out of oil fill tube
 

I agree, a Leak Down test will help identify the problem area. It would be my guess that it is probable a piston ring problem.

Some engines use a Windage Tray, similar to the Dipper Tray in a Model A, to minimize the oil splashing around in the pan. If the Dipper Tray was not installed, it may cause a problem like this at higher RPM, but if it wasn't installed, I doubt if it would oil the rod bearings correctly. Just another thought to check if the leak down doesn't identify the problem.

With this much internal "pressure", I surprised the rear main is not leaking a lot more.

Re: Oil coming out of oil fill tube
 

The copper scrub pad is a way of stopping the oil loss, although if you thread a fine wire through it before you poke it down the tube, it will be easier to pull out and clean.

Re: Oil coming out of oil fill tube
 

Re: Oil coming out of oil fill tube
 

I have the same problem of oil blow by on my rebuilt engine. Like Bill mentioned an old sock over the filler pipe takes care of the problem until you find out what else may be a problem or it may be just the break in time for the engine or like mentioned to much oil, or ???

Re: Oil coming out of oil fill tube
 

I may be wrong but that sounds like a little more than "misting" to me.

Re: Oil coming out of oil fill tube
 

I had a similar situation with my rebuilt Cabriolet engine. After a good run of say 10-20 miles at highway speeds, I would lift the hood to find oil slobbering out the filler pipe. Page 424 of the service bulletins talks about proper orientation of the tabs-mine were about 90 degrees out from the recommended orientation of "pointing down." Repositioned the filler tube with no real changes. I then installed an original, old and used aftermarket filler cap with the louvers in it-kind of a fanned out blades built in underneath the cap. I swear not only did the engine quit drooling oil but it felt as if it helped seat the rings better or something. I could feed the engine more advance and it ran great. By the way, I tried the sock thing-don't waste your time. Instead of coming out the filler tube, the oil made its way out the rear main. Big time. Now, I have only the small drop of oil after a run and no oil slobbering. I can't explain why this particular cap made a difference-increased backpressure helping rings fully seat??