NOW WHAT??
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Junior User
Joined: Apr 2013
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From: Central Coast, Calif.
NOW WHAT??
So yesterday, I drove my 1970 Ford F100 for a 100 mile trip. When I got home I checked under the hood and there was motor oil all over the side of the engine. It's apparent that the oil is coming for the dipstick tube. The truck has a 300 straight six and runs pretty decent with the exception of some engine vibration at higher speeds. So I was wondering what would cause oil to come from the dip stick tube? I noticed a few weeks ago that the stick was loose so I gently crimped the end so I would not back out of the tube. I don;t remember having an o-ring located in the inside of the dipstick? I have installed a oil pressure guage which show good old pressure and just completed an compression check with all cylinders being above 130.
Any ideas on why it's puking oil out of the tube. I'm almost 99% sure it's coming from the oil dipstick tube as it happen a few weeks ago before I crimped the stick.? Would the vibration come from my worn out rubber motor mounts?
Thanks
Jim
Any ideas on why it's puking oil out of the tube. I'm almost 99% sure it's coming from the oil dipstick tube as it happen a few weeks ago before I crimped the stick.? Would the vibration come from my worn out rubber motor mounts?
Thanks
Jim
Lead Driver
Joined: Jan 2003
Posts: 9,893
Likes: 12
From: Ohio
^^ This.
If the PCV is not drawing vacuum out of the engine, then all that pressure has to go somewhere. Usually popping the dipstick up enough to blow oil film out.
My first 428 used to blow the filler cap off by the time I got to third gear(driving it hard). Lots of blowby(bascially motor was worn out).
If the PCV is not drawing vacuum out of the engine, then all that pressure has to go somewhere. Usually popping the dipstick up enough to blow oil film out.
My first 428 used to blow the filler cap off by the time I got to third gear(driving it hard). Lots of blowby(bascially motor was worn out).
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How are your PCV hoses hooked up?
Positive Crankcase Ventilation (PCV)
Make sure there is not a mung build up in the hoses.
Positive Crankcase Ventilation (PCV)
Make sure there is not a mung build up in the hoses.
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Junior User
Joined: Apr 2013
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From: Central Coast, Calif.
I'll check the routing when I get home. I know I have some off the manifold and also the carb? How would you test to see if the PCV is good? I took it off and it rattle so I'm to assume it is good?
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Junior User
Joined: Apr 2013
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From: Central Coast, Calif.
good info
How are your PCV hoses hooked up?
Positive Crankcase Ventilation (PCV)
Make sure there is not a mung build up in the hoses.
Positive Crankcase Ventilation (PCV)
Make sure there is not a mung build up in the hoses.
Thanks again for the replies.
Jim
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Super Moderator
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It would be one or the other. You will get vacuum off the carb and manifold. One side, where the PCV valve is connected, goes into the manifold or carb. The other side is a source of clean fresh air to go into the crankcase. If you are hooked up to two vacuum ports, you should be sucking oil big time in the one without the PCV. Hard to tell without seeing it. Good luck on a fix.
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Junior User
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From: Central Coast, Calif.
For what? I have a motorcraft with the check valve inside. It was changed about 400 miles of so.What would I be looking for??
Thanks
Thanks
Elder User
Joined: Oct 2011
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Probable not your problem but only takes a second to check.
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