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Discussion Topic:
Rear main leak
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joe b |
07-18-2011 @ 5:30 AM
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Member
Posts: 389
Joined: Oct 2010
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This winter I replaced the rear main oil seal on my '41 along with clutch pressure plate etc. The job now has 380 miles on it and the seal is leaking again as bad as ever. What did I do wrong?
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37RAGTOPMAN |
07-18-2011 @ 5:38 AM
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Senior
Posts: 1969
Joined: Oct 2009
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check the oil filler filter for any clogging, to much pressure in the engine will force the oil out the rear main, its the easiest for it to escape from there, this is a remote possible, but could also be the main bearing with wear, did you plastic gauge the rear main bearing lets hear how you made out,,, 37 RAGTOPAMN
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supereal |
07-18-2011 @ 5:52 AM
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Senior
Posts: 6819
Joined: Oct 2009
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Joe: Be sure the leak is actually from the rear crank seal. If it is leaking from inside the clutch housing, it can be from the oil pump drive cover or the pipe plug that seals the oil gallery at the rear of the block, both behind the flywheel. If you trimmed the ends of the seals at installation, it can also leak. If the leak is actually running down the back of the engine, where it is hard to see, it may be from or around the oil pressure sender. I've seen that more than once. Bar's Leaks has come out with a new oil additive claimed to seal such leaks. Usually, I don't have much faith in additives to cure mechanical problems, but Bar's is a long standing brand, it it might be worth a try before you pull the engine.
This message was edited by supereal on 7-18-11 @ 5:54 AM
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51f1 |
07-18-2011 @ 7:17 AM
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Senior
Posts: 573
Joined: Oct 2009
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Also, oil can leak between the rear main bearing cap and the block. The mating surfaces should have sealant applied. But, if you trimmed the rear seal when you installed it, that's your problem.
Richard
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oldford2 |
07-18-2011 @ 4:40 PM
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Posts: 275
Joined: Oct 2009
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I don't believe the 41 engine has an oil seal, just a slinger. If you "replaced it" You must not have a 41 engine (221). So you need to give more details. What engine do you have?? Where is the oil coming from?? Out of the "cotter pin" hole?? As Bob said, don't try to fix it with stop leak. John
This message was edited by oldford2 on 7-18-11 @ 4:54 PM
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supereal |
07-19-2011 @ 10:08 AM
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Senior
Posts: 6819
Joined: Oct 2009
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How much oil are you putting in the pan? If you don't have a filter, four quarts is the right amount. I know a lot of books say 5, but that is wrong. Five quarts in a flathead without a filter almost guarantees lots of leakage at the rear of the engine. If the engine uses a packing (rope) seal, it must have a 91A crankshaft. The slinger type is a 78 or 99A crank. The slinger type was superceded by the packing type in the 39-41 years. As engines were frequently changed as the years went by, it is difficult to know what it is without a tear down, anyway.
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oldford2 |
07-19-2011 @ 4:28 PM
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Posts: 275
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Well, this is a little frustrating and happens often. Someone posts a problem looking for help and several posts trying to help. Many times more info on the problem is requested and no response by the poster. So the helpers get turned off by no response. Why do they post??? John
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supereal |
07-19-2011 @ 4:33 PM
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Senior
Posts: 6819
Joined: Oct 2009
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Huh?
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oldford2 |
07-19-2011 @ 4:53 PM
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Member
Posts: 275
Joined: Oct 2009
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Bob, My post is just asking why joeb has not responded with more details. John
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supereal |
07-19-2011 @ 9:29 PM
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Senior
Posts: 6819
Joined: Oct 2009
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Thanks, John. Now I understand. For those of us who try to help, getting at least the year and model is a "must". While old Fords probably look alike to many, the differences, as you know, are often subtle, and it certainly helps all of us to focus on suggesting an answer.
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