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Discussion Forum
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Secrets of the Rear Main Seal

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dick

03-10-2001 15:11:49




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Looks as though the rear main oil seal on my 300U is leaking again. So far, two unsuccessful attempts to fix it have been made. I'm not doing the work myself, and the work is covered by warranty, but I would like to get off this merry-go-round, hopefully before the outfit which is doing the work goes bankrupt. Is there some secret to getting these felt seals to hold oil known to only "old" Farmall guys???? If so, would someone mind sharing it??!!??

Thanks for any input.

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Les Repair

03-11-2001 10:22:38




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 Re: Secrets of the Rear Main Seal in reply to dick, 03-10-2001 15:11:49  
Have you checked the breather pipe assembly for being plugged. If you have a lot of crankcase pressure those felt seals won't hold.



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dick

03-12-2001 13:17:43




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 Re: Re: Secrets of the Rear Main Seal in reply to Les Repair, 03-11-2001 10:22:38  
Think we've got that covered. Had them regasket the pushrod cover which was leaking slightly while they were doing all this other stuff. So they had that all apart and the vent should have been cleaned in the process (I hope).

Thanks to all for your input. I'll let you know if/when this gets fixed, and what seems to be the major problem, assuming one is found.



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Lee K.

03-10-2001 16:53:29




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 Re: Secrets of the Rear Main Seal in reply to dick, 03-10-2001 15:11:49  
Did you try butting a Speedy Sleeve on the crank. You might have a slight groove on the sealing serface of the crank. A speedy sleeve will ussually fix it if all else fails.



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gene b

03-10-2001 15:44:50




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 Re: Secrets of the Rear Main Seal in reply to dick, 03-10-2001 15:11:49  
some one should check bearings if they are loose this lets a lot of oil by for the seal to stop



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Ace Schrunk

03-10-2001 16:14:00




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 Re: Re: Secrets of the Rear Main Seal in reply to gene b, 03-10-2001 15:44:50  
Secrets Yes the seal holders are pewter and most don,t put them on right. Most time,s there are warped. If you don,t use new they will leak between the 2 haves where the little gaskets go. when they take them off this time cleen them up good and hold them together to see if they are warped. I would bet on it, you may help them with a file. When put back on use a heave gasket sealer put all screws in before tightening any and tighten the 2 that pull the 2 haves together then tighten the screws that hold the parts on to the block. Oil felt good with motor oil. If need more help call( 712 642 5753)

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