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Ford Oil Leaks and Seals

 
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John Black



Joined: 23 May 2016
Posts: 12

PostPosted: Thu Nov 01, 2018 4:29 pm    Post subject: Ford Oil Leaks and Seals Reply with quote

Hi,

I am rebuilding a Model B engine for my Pietenpol.

Every Model A/B that I know about leaks oil at the rear oil seal.

I am thinking of using a modern rear oil seal like the small block Chevrolet V-8 kit that Dan McEachern offers for Model A/B's.

Has anyone used a moden rear oil seal ? Did it stop the oil leaks ?

Any guidance is appreciated.

John
La Conner, WA


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taildrags



Joined: 29 Dec 2009
Posts: 1625
Location: Medford, OR

PostPosted: Thu Nov 01, 2018 7:22 pm    Post subject: Re: Ford Oil Leaks and Seals Reply with quote

John; I know nothing about the Ford A/B engines or how their seals are configured but I do have some experience with oil seal leaks at the front main seal (propeller end) of my Continental A75. The leaking occurred after a complete overhaul of the engine, including sending the crank off to Aircraft Specialties Services or someplace like that for a complete reconditioning. Once I traced the source of the leak, I ordered a new seal and it came with instructions... Continental Service Bulletin M76-4, attached. I determined that my crank had not been prepared as per the service bulletin, in that the plating had not been polished off in the area that the seal contacts, nor had the helical 'scratches' been made on the area in question. Apparently, the helical scratches impart a screwing motion that "screws" the oil back behind the seal as the engine runs. When the engine is sitting and the oil is cold, it's thick enough where it doesn't tend to leak past the seal but when it's warm and under pressure is when it wants to seep out and the screwing effect helps. My engine now runs bone-dry at the seal.

This may be completely contrary to Ford engine practice and small-block Chevy engine practice, but it has worked on my Continental and it probably turns roughly the same RPM as a Ford, if that matters. I offer this only as food for thought, and am also wondering if anyone out there has tried this crank prep technique for a Ford rear seal.


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Oscar Zuniga
Medford, OR
Air Camper NX41CC "Scout"
A75 power, 72x36 Culver prop
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RobV



Joined: 15 Aug 2018
Posts: 1
Location: Fresno, CA.

PostPosted: Fri Nov 02, 2018 7:51 am    Post subject: Re: Ford Oil Leaks and Seals Reply with quote

John,

I have 2 model A engines running currently with a 3rd on the bench. One is in a '29 Model A, one is a stationary genset, the third id a spare. So far no leaks on my rear mains with original style seals. The only new seal I've tried is for the water pump shaft, and I went back to lead packing.

Try taking a look at https://www.antiqueenginerebuilding.com/REARMAINLEAK.html

RobV


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