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By dgmford - 8 Years Ago
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Hi, new to the forum and somewhat new to y-blocks, I just purchased a 1957 Fairlane 500, original 292 with I think 119k original miles. The rear seal is leaking and wondering how hard it will be to change with the motor still in the car or should I take it out. the car has been sitting for sometime and probably why the seal is leaking.
Any suggestions would be helpful. thank you and great site.
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By oldcarmark - 8 Years Ago
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Welcome to the Site. Your Car is simply marking its Territory just like a Dog. These Seals leaked from the Day these Cars were new. It can be changed in the Car but You might want to check the rest of the Engine for any other Problems. Is it in running Condition? As far as the rear main Seal there are much improved replacements available. They don't always fix the Problem. Most of the Time its because they weren't installed correctly.
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By dgmford - 8 Years Ago
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thank you, it does run good, no noise, needs a tune up and oil change, only had a couple weeks, the brakes are dead, so need to replace the master before I can drive and see how she really is. Maybe a bit of driving my slow down the leak.
thanks for the response.
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By Lou - 8 Years Ago
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If you have oil on the drivers side of the pan and or engine it is not the rear main seal.
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By oldcarmark - 8 Years Ago
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Lou is correct. You should give the Engine a good cleaning and try to verify where the Oil is coming from. If its been sitting, Gaskets and Seals can dry out.
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By dgmford - 8 Years Ago
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good idea, I plan on going through it this weekend sometime. Thanks again.
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By miker - 8 Years Ago
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All the above is good advice. One comment. I don't know if they were made for the 292, but Best Gasket made some "orange" seals for the 312. They are silicon, not neoprene. They fail in 500 or so miles. I just changed mine, motor in car, in my 312. Might be some NOS laying around, and might be some for 292's. Someone will know. If it comes to that, don't use one.
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By Ted - 8 Years Ago
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Neoprene rear mean seals are readily available for the Ford 292 engines from a variety of different manufacturers. These can be installed with the engine in the car.
If getting the neoprene type seal from a run of the mill parts store, the 292 seals are likely all that will be available. The FelPro number for the 292 engines is BS 6141. If going to a specialty parts store that deals primarily with Thunderbirds and older Fords, then rubberized 312 seals are also available and these are a slightly larger diameter than those for the 292. As miker mentions, Best Gasket did make a orange seal for the 312’s for a short period of time and those do wear out very quickly. Best Gasket has since changed out the material in the 312 seal to the same material used in the 292 seal which makes the two seals look almost identical but because of sizing differences, they are not interchangeable. Best Gasket has tried to get all those orange seals back in their hands but there are still some out there; those seals were for the 312 engines only.
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By Jerome - 8 Years Ago
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Ted, Best Gasket's website currently shows a red brick colored "rubber" 312 y-block rear main seal, part number 3A52. Is this the good 312 y-block part number now?
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By paul2748 - 8 Years Ago
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Explain further?
Lou (10/25/2016)
If you have oil on the drivers side of the pan and or engine it is not the rear main seal.
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By Ted - 8 Years Ago
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paul2748 (10/28/2016)
Explain further? Lou (10/25/2016)
If you have oil on the drivers side of the pan and or engine it is not the rear main seal.
Probably eluding to oil leaks from the oil pump, oil filter area, and/or oil transfer tube from the pan to the oil pump.
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By Ted - 8 Years Ago
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Jerome (10/26/2016)
Ted, Best Gasket's website currently shows a red brick colored "rubber" 312 y-block rear main seal, part number 3A52. Is this the good 312 y-block part number now?
Best Gasket did not change the part number when their 312 seal material was revised from orange to black. The 3A52 number is a good number for the revised seal. If ordering the Best Gasket 312 seal from anywhere but Best Gasket, just insure that you are getting the ‘black’ seal as there may still be some ‘orange’ seals sitting on vendors shelves. I’ve had good results with the revised ‘black’ seal.
Another option is the 312 neoprene seal sold by FordCraft located in Plano, TX. I’ve also used this seal on the 312 engines with great success. The Ford Craft phone number is 972-423-4636.
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By Lou - 8 Years Ago
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How much is it leaking?
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By dgmford - 7 Years Ago
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its dripping pretty good, it could be the oil pump I've not yet started looking at it, been working on the brakes.
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By NoShortcuts - 7 Years Ago
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I just read this thread. I didn't see anyone reference the following articles referring to y-block rear seals. Click on the links below for some helpful information.
http://www.eatonbalancing.com/blog/2009/06/28/warped-rear-seal-retainer-on-a-y/
http://www.eatonbalancing.com/blog/2008/09/10/neoprene-rear-seal-installation-for-the-y-and-others/
Hope this helps! 
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