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Ford Tractors Discussion Board

NAA rear seal again-long


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Posted by fixerupper on April 05, 2014 at 12:03:15 from (100.42.82.100):

Still working on this NAA trying to get the rear seal to not leak. When we got the tractor with the pan was barely bolted on and the rear bearing cap was in a box. The previous owner had tried five times to get the rear seal to quit leaking without splitting the tractor so we split it and put the engine on the stand where we could work on it. One major culprit we found wasn't even the engine, it was the transmission input seal on the two speed that he had added. The bellhousing was full of oil and that tranny seal was the culprit. We replaced that seal and it's sealing OK.

We put in a new Felpro neoprene rear engine seal along with the neoprene side seals with the wires you drive in along side, put it together, ran it up and down the road and the rear engine seal still leaks, the seal itself, not the side seals.

I have been reading the archives here on YT and found lots of very good information on installation. I have followed all of the helpful suggestions, but this thing still leaks. In one of the posts in the archives Felpro seal #BS6143-3 was mentioned. The felpro seal I have has 61411 on the seal itself. I tried Googling the numbers but came up empty handed. Is the #BS6143-3 a kit, or is it the part number for the seal itself? Also, Hobo, you mentioned using compressed air and bubble soap to check the seal while the engine is still on the stand. How do you do that? This time I want to be sure it doesn't leak before it comes off the stand.

On another website I was reading up on tips to successful two piece seal replacement in car engines and crankshaft misalignment in the seal due to align boring the block came up. I highly doubt this is the case with this engine since the original seal just dripped a bit before the owner tackled this job. Jim


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