74 2.7L 911 Oil Foaming Problem

[Foamy911]

Just picked up a 74 911 that has been sitting for over 15 yrs. I cleaned the fuel system, electrical, and changed the oil. Fired it up and it runs well................................... Right up to when it gets a little hot, then it does a fantastic rendition of Mt. St. Helens by spewing foamed oil into my airbox, which gets sucked into the intake and smokes like chimney. I checked the dipstick and it's just over half way to the max level. Ok now to show my ignorance, should I be using a special oil with anti-foaming additives? The engine has little to no blow-bye and was rebuilt less than 10K ago. I'm baffled and frustrated. Any help is appreciated !

[magcuda]

are you checking the oil level with the engine warm and running??

oil change of the tank and engine should be about 10 quarts

[dohertycm]

are you checking the oil level with the engine warm and running??

oil change of the tank and engine should be about 10 quarts

You have over filled the oil tank. Take some oil out. Your not the first and wont be the last.

I have a 74 as well....AND I LOVE IT!

[dshepp806]

"warm": meaning drive her for a good bit (1/2 hour) then check the oil level, while running,..and on level ground.

Best,

Doyle

[aricaandjustin]

Hey Brother

Not sure if you figured this out yet but I just had the same thing happen to me...very scary. I was thinking that I broke a ring or something and I closed the hood for the night and went inside very dismayed....thinking "how could I screw up on an oil change" I looked in the air box and saw oil the next day. I rechecked the oil and found the reservoir empty even though I had added 10 quarts (liters up here) for the oil change the day before.

I added enouigh to get a reading on the dipstick and started the engine. It warmed up until oil started pouring into the intake box again. This time several pints poured in until I shutdown the engine. To get the level right, I drained out pretty much the same as I had readded. This time I ran it again with the cap off the reservoir and ran it until I could see oil circulating down the fill tube (with a flashlight). I put everything back together and it ran good and without smoke.

In hind sight, I think that you have to consider that everything get drained out in an oil change.,,the reservoir, the crankcase, the filter, the heat exchanger etc. To get this stuff all full again takes some time. I had the best success when I ran it until it warmed up with the cap off the reservoir and continuously checking the level. I agree with the other reply that I think that when you overfill the reservoir, the oil spills over into the intake box but if you just add all the requried oil in in one shot, you will likely see this same thing....

Edited May 14, 2008 by aricaandjustin