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06-30-2014, 12:13 PM | #1 |
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Join Date: Oct 2013
Posts: 46
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Confused and Concerned about Rear Main Leak
Finally got my Model A Running and Street Legal. But it leaks a lot of oil from the Cotter Pin below the Flywheel Housing when I drive it on the road. It does not leak when just idleing in the garage.
I dropped the Oil Pan to take a look at the Drain Tube that several people have talked about on other posts. I bought a drain tube from Snyder's hoping mine was missing, but there it was. I compared the two tubes and my new one is about half an inch longer than the one I took off. (See Picture at end of Post) TWO Questions: 1. Could the shorter tube cause the leak? 2. Is there any thing else I should look for while the Oil Pan is off before resigning to the fact I have bigger problems? Thanks. |
06-30-2014, 12:36 PM | #2 |
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Join Date: May 2010
Location: Tulsa Oklahoma
Posts: 298
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Re: Confused and Concerned about Rear Main Leak
Lay the old one on top of the new one and see if it is only 1/2" shorter. Looks like more to me. And yes a short one can be a problem.
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06-30-2014, 12:45 PM | #3 |
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Join Date: May 2010
Location: Lynden, Wa
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Re: Confused and Concerned about Rear Main Leak
Have you noticed the threads are different.
Mike
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06-30-2014, 01:10 PM | #4 |
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Location: NC
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Re: Confused and Concerned about Rear Main Leak
I noticed that also.
Rear main leaks are cause by a lot of things. Number one to much crankshaft end play. To much clearance in the rear main bearing. Main cap not flat. Leaking around rear main bolts. Shims not in place. Leaking around rear slinger seal. To much crank case pressure. Drain tube plugged. Drain tube blocking drain hole. Babbitt in inside drain in rear main cap. Plus some I forgot. Also a lot of time you find it is the camshaft rear bearing that is leaking. If you do not want a leaker you have to check all this before you put it to together. |
06-30-2014, 01:53 PM | #5 |
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Location: santa cruz, calif
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Re: Confused and Concerned about Rear Main Leak
here is a good treatise on this problem linked below. Bottom line: its not always what you think it is. Check everything.
As long as the pan is off, check your main bearing clearances If the ctr main is loose, the flexing crankshaft acts like a pump, pumping the oil out the back. So check it too, even if it is a pain in the rear. A very common cause is that the tube is screwed in to the cap so far it dams up the oil flow. Measure the # of threads into the cap and compare to the cap, then cut a "V" in the back side of the tube, leaving enough threads to catch the main cap, but none to occlude the channel so the oil has a way down and out the main channel. Be sure to tack the tube with a small MIG or TIG weld to secure it. Don't heat up the babbit so much it melts. http://www.antiqueenginerebuilding.c...RMAINLEAK.html |
06-30-2014, 05:25 PM | #6 |
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Location: Camino, CA.
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Re: Confused and Concerned about Rear Main Leak
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07-01-2014, 07:36 AM | #7 |
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Join Date: May 2010
Location: Northern Ontario, Canada
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Re: Confused and Concerned about Rear Main Leak
The rear main janitor works well, but you have to remember to empty it periodically. Since oil does not evaporate, the rear main janitor will gradually fill up. Then when you go around a corner, the oil will spill out and put a nice oil line down on the road for a short distance
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07-01-2014, 07:48 AM | #8 |
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Location: ca.
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Re: Confused and Concerned about Rear Main Leak
have you checked to see if it is actually the rear main , or maybe the cam gasket between the motor & clutch housing .
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07-01-2014, 03:58 PM | #9 |
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Join Date: Apr 2012
Posts: 1,542
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Re: Confused and Concerned about Rear Main Leak
the whole concept of a design where any part of the rear main bearing is placed outside of the engine pan sounds bizarre to me.....I believe the Company changed that design after the Model "A", didn't it?
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07-01-2014, 06:22 PM | #10 |
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Join Date: Apr 2013
Location: Columbia, TN.38401
Posts: 422
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Re: Confused and Concerned about Rear Main Leak
Wish you guy's could get it right, it don't leak oil it just marks its spot. [LOL]
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