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Allis Chalmers Discussion Forum
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WD front crank seal

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Bob Russell

12-30-2007 17:31:27




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I have a WD that I bought 10 years or so ago for a chore tractor that leaked oil out the front seal. I've been putting off doing anything about it, but I guess it's about time I fixed it. What has to come off to get to it??? Just the radiator, or do I have to pull the steering box too? I also aquired another WD 45 recently that I am thinking of restoring, but it needs some major engine work (Sat full of rainwater for several years...cam is rusted and crank would have to be reground) What is involved in pulling the engine? Can I just loosen one side rail and pull it? Thanks for any info.

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JMS/.MN

12-30-2007 18:00:01




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 Re: WD front crank seal in reply to Bob Russell, 12-30-2007 17:31:27  
WD seal- take off the radiator, leave the steering box in place. Remove the front cover, put in the seal, and very carefully center the seal in the cover over the crankshaft before tightening it down. Older seals were thicker, it is possible to double up and put two of the thin ones in place. WD45- no need to loosen or pull side rails. Remove the radiator, also the cotter key holding the spring on the cranking shaft, plus the bracket. Gives room to pull the engine forward. Need to remove the front engine support as well for clearance. Also the thin cover in front of the flywheel. I made a lifting bracket by drilling four holes in a two inch channel iron, matching the bolt pattern on the valve cover. Channel has a lift ring welded to the center. Book says you can pull it with two, but four is insurance.

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Bob Russell

12-31-2007 05:32:38




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 Re: WD front crank seal in reply to JMS/.MN, 12-30-2007 18:00:01  
thanks for the information...sounds simpler than I thought. Something I forgot to ask...I need new valve stem seals too I think. Anything special involved in replacing them, other than using air pressure or nylon rope to keep the valves from falling in?



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Brian G. NY

12-31-2007 14:35:09




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 Re: WD front crank seal in reply to Bob Russell, 12-31-2007 05:32:38  
I don't think you'll find any valve guide seals unless someone has installed them. They were not installed from the factory. There has been some discussion regarding this here in the past, I think. Some believe the addition of seals will diminish lubrication of the valve stems and result in more wear. I know my WD gives a little puff of smoke when started up while still warm but I'm not going to be concerned. If there is a real serious problem in that area, you probably need new guides and or valves. BTW, I have changed many valve guide seals in 289/302 Fords using the air pressure method. I made my own plug hole adaptor using an old plug and a male air hose coupling fitting. The Ford seals had a habit of drying out, breaking up and finding their way to the oil pump and causing the pump rod to twist off. The good thing is the distributer runs off the same rod and the engine shuts down before any serious damage.

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Jerry Coulter

12-31-2007 14:25:49




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 Re: WD front crank seal in reply to Bob Russell, 12-31-2007 05:32:38  
I don't remember ever selling seals for the valve stems on any AC engine. We just replaced a lot of valve guides. The front crankshaft seal for the WD45 had a double lip making it a wider part than the stock WD-WC. We installed the WD45 seal in WDs when we had a problem leaker. Just be certain to clean and polish the seal area on the shaft really good.



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Bob Russell

12-31-2007 15:01:41




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 Re: WD front crank seal in reply to Jerry Coulter, 12-31-2007 14:25:49  
thanks for the info on the valve seals. I've never been into one and just assumed they had seals. I always get a big puff of blue smoke when I open the throttle, so I guess I must have some sloppy guides. Don't think it's rings as the plugs always seem to burn clean and I never get missfires.



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