| MICHV8 | -- 09-26-2012 @ 8:13 AM |
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OK...after struggling to remove the differential drain plug, a puzzle for the Ford historians: why are transmission drain plugs male and the differential female? Come to think of it, are they the same tread?
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| supereal | -- 09-26-2012 @ 9:10 AM |
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Both plugs are standard pipe thread, which is a cone shape and seals as it tightens. The rear plug is easily removed using a 3/8" socket wrench. An extension makes the job easier. As for the transmission with the square headed plug, I assume it was used because of the tight fit between the head of the plug and the frame, where using a recessed plug may not provide space to wield a socket wrench. The recessed plug on the differential housing also is protected against damage from obstacles on the road. This is likely because the Model T's were driven over some terrain that would flummox a Jeep.
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| Old Henry | -- 09-26-2012 @ 10:05 AM |
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I know the differential drain plug is supposed to seal by just tightening without any sealant but mine didn't and continued to drip oil until I put some RectorSeal #5, petroleum tolerant pipe dope, on the threads. Tried Teflon tape but, of course, that doesn't work with petroleum. Here's what I used: http://www.rectorseal.com/RectorSeal-No-5.php Old Henry (The older I get, the better old looks.)
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| CharlieStephens | -- 09-26-2012 @ 10:39 AM |
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My guess, and it is just a guess, would be that the female headed plug would be less likely to be damaged if the rear end hit something. Charlie Stephens Revised to add word "headed" to make it easier for 3W2 This message was edited by CharlieStephens on 9-26-12 @ 6:32 PM
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| 3w2 | -- 09-26-2012 @ 4:29 PM |
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Since both plugs are threaded, they are both male, not one of each.
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| supereal | -- 09-26-2012 @ 6:59 PM |
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I think he was referring to the type of plug head, rather than the threaded portion. One of the reasons leaks develop is that the rear end is overfilled. Oil from the transmission travels down the torque tube into the axle.. That is why there always seem to be plenty there. If light oil is used, it makes the problem worse. Remove the plug and allow any excess to drain. If you use 140 weight oil, it will also help. It doesn't hurt to use sealer on the plug, but if the threads on both the plug and the hole are not damaged, it shouldn't be necessary.
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