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Oil leak at dipstick tube flange fixed -with pics!

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Old 03-04-2014, 06:34 PM
devonhubb devonhubb is offline
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That inner o-ring can be a bear. Tip - if you have less threads showing at the top of the flange nut than the bottom, the o-ring has fallen out of the groove.

I wound up smearing the o-ring with vaseline. The vaseline made it sticky enough to adhere to the groove for reassembly.
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Old 10-30-2014, 04:44 PM
Powerstoke73 Powerstoke73 is offline
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Originally Posted by zukidave View Post
I was nervous about this repair. I have read all about it, I read this whole thread and more. It sounded harder than it was!
I got the dipstick tube O-ring, dipstick tube adapter O-ring, and new flange nut from the local Ford Dealer (what a rip-off at $47). Then last Sunday I went and got some needle nose Vise Grips and made a Widget. I disconnected the batteries and took off the starter. Then took the dipstick tube and flange nut off, removed the old O-ring's from the tube and adapter. Cleaned things up with rag and Q-tips. Put every thing back together using the new parts and using a little Loctite on the threads.
I figured the original O-ring's lasted 16 years and 280000 miles, I was happy with that! And If a second set of original type O-rings lasted that long I would be doing good. If not, It will be easier to repair a second time if it wasn't all gooped up with sealers.
After repair, I started the engine. About 10 minutes later I was disappointed to see a drip of oil on the flange nut. I carefully tightened the flange nut as much as I dared.
On Monday morning, after my 30+ mile drive to work, I was very disappointed to see oil all over the bottom of the truck. I was not looking forward to trying this repair again! After the drive home, the oil mess didn't look much worse. It seemed the leak had sealed some. So I hosed the oil off. Tuesday morning after driving to work, there was just a little oil that ran from the flange nut to the bottom of the oil pan. I hosed it off and it has not leaked since.
While making the repair, I did notice that the O-ring didn't protrude very much from the grove in the adapter. As mentioned in earlier posts, the O-ring swells in oil. I think the O-ring is designed to easily fit in the adaptor grove for ease of assembly, then swell to tightly fill the grove and mating surface sealing the assembly.
The moral to this story is; I don't believe the extra seal and RTV gooped all over are necessary. And if it leaks a little after repair, DO NOT PANNIC!!! It will probably seal after a day or two of driving.
IMHO This is an easy repair. Be prepared, but don't over think it.

Was it a constant leak that you could see right away or was it more of a seaping kind of leak

Thanks for the all the helpful information
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Old 05-17-2015, 12:55 AM
sds5591 sds5591 is offline
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Originally Posted by rtazz17 View Post
I did this repair except I replaced with the stock o ring that sits on the inside of the pan on the flange...Did it in 1 hour and it looks great(no leaks and none of that mess on the outside}If you need help pm me and I can tell you exactly how I did it without dropping flange into pan....3.27 for the o-ring from ford and 1 hour to do...
Can you send instructions on how you replaced your dip stick o-ring in 1 hour ?

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