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03-17-2017, 11:57 AM | #1 |
Member
Join Date: Jan 2013
Location: Lehi, Utah
Posts: 60
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Rear Main Oil Leak Help!
Hello,
I had a bad rear main oil leak and I pintpointed it to a problem around the rear main bearing cap or return tube. This is a fresh rebuild of the engine so I was disappointed to see a steady stream of oil coming from the flywheel hole. I removed the pan and rear main bearing cap to clean and reinstall everything. The question is that my return oil tube has a ball in the end that looks like it will restrict the oil return. It is an original tube I believe but I noticed the replacements don't have the ball. Should I remove the ball I really don't want to do this all over again so any suggestions would be really appreciated. Thanks! |
03-17-2017, 12:04 PM | #2 |
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Location: Central, IL
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Re: Rear Main Oil Leak Help!
AA's did have a check ball tube so when they went to unload grain and backed down the steep incline oil wouldnt run out all over the place with the engine off.
Not sure how to tell you to proceed haha.
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03-17-2017, 12:05 PM | #3 |
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Location: Lehi, Utah
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Re: Rear Main Oil Leak Help!
That makes sense. It just seems like this might be my problem because it looks like it will not let much oil past it.
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03-17-2017, 12:08 PM | #4 |
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Join Date: May 2010
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Re: Rear Main Oil Leak Help!
De and not restricted in any way.finitely remove the ball and assure that the tube is open
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03-17-2017, 12:10 PM | #5 |
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Re: Rear Main Oil Leak Help!
Please ignore my previous post. I intended to say , definitely remove the ball and assure that the tube is open and not restricted in any way.
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03-17-2017, 12:14 PM | #6 |
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Re: Rear Main Oil Leak Help!
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Search the forums for pictures of oil grooves in the babbit - IF im remembering correctly they should not go all the way to the rear end of the engine or you will get excessive oil leakage...
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1929 Model AA - Need long splash aprons! |
03-17-2017, 12:20 PM | #7 |
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Join Date: Jan 2013
Location: Lehi, Utah
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Re: Rear Main Oil Leak Help!
Great advice. I will remove the ball and reinstall. I am sure that was my issue all along. A lot of work just to remove a little check ball.
Really appreciate the fact that I have a lifeline. For a newbie this can get frustrating quick. Thanks! |
03-17-2017, 12:35 PM | #8 |
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Re: Rear Main Oil Leak Help!
While you are in the neighborhood, check the end play of the crank, and the clearance of the bearing, this has a lot to do with leaking rear mains.
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03-17-2017, 12:57 PM | #9 | |
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Re: Rear Main Oil Leak Help!
Quote:
You do not state whether you are dealing with a truck engine(AA), with an A engine or a B engine ? Makes a difference for proper application, eh ! If not AA, there should NOT be any ball in drain tube. If an A OR B engine the tube will be one of two sizes used by ford. Now make sure that you use the correct size drain tube for you application. Good luck |
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03-17-2017, 01:41 PM | #10 | |
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Re: Rear Main Oil Leak Help!
Quote:
It was common practice in later years (40-50-60's etc) to swap out your car engine for an AA engine - identical except that check ball BUT aa's especially grain trucks like nowadays only get used a handful of times a year so they were low mile engines. Very common to put in a car that has a worn out engine so thats probably how you ended up with it. Does your engine serial # start with AA?
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03-17-2017, 04:50 PM | #11 |
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Location: Lehi, Utah
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Re: Rear Main Oil Leak Help!
The engine is an A. We had a few engines that we were robbing parts from when we rebuilt this one so we might have grabbed the drain tube from the AA engine we have. Someone robbed parts from this engine 30 or 40 years ago. Really interesting to know. That is really why I love working on these cars, you learn something every time.
I got everything buttoned back up and took her for a drive and no leak so that must have been the issue. Thanks for the help! |
03-18-2017, 12:07 AM | #12 |
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Re: Rear Main Oil Leak Help!
awesome good to hear, some people overfill the pan too, as long as the oil level is between F and L your good.
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1929 Model AA - Need long splash aprons! |
03-18-2017, 05:11 PM | #13 |
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Re: Rear Main Oil Leak Help!
Also, excessive blow-by can pressurize the crankcase and push oil out the rear seal. It also comes out the breather and distributor hole, too!
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