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Allis Chalmers Discussion Forum

WD 45 oil leak revisited - Help please!

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02-18-2004 04:50:04

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I have oil dripping off the breather on top of the valve cover on my WD 45 gas. Any suggestions on how to stop this? I know the valve cover is not filling up and running out. Would some steel wool shoved down the breather tube help stop some of this? Certainly I'm not the only one to have this happen.

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02-19-2004 07:15:39

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 Re: WD 45 oil leak revisited - Help please! in reply to Jr64, 02-18-2004 04:50:04  
I've heard that a dirty breather cap can cause this. Clean any you can find in some solvent or gas, and try again. Hope this helps.

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02-18-2004 19:00:48

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 Re: WD 45 oil leak revisited - Help please! in reply to Jr64, 02-18-2004 04:50:04  
I have never seen this problem before, but is it possible there is too much oil in the crankcase. If I remember correctly the oil fill cap is also a breather, could that be pluged and all the crankcase pressure is going out the valve cover breather and taking oil with it? I got out my parts book and there is a oil line that feeds the rocker shaft and that may have broke and is shooting oil right at the breather. Hope this helps I am kinda shooting in the dark without looking at the tractor with the valve cover off.

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02-18-2004 21:44:28

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 Re: Re: WD 45 oil leak revisited - Help please! in reply to Matt, 02-18-2004 19:00:48  
On a WC,WF,WD magneto ignition, the fill cap is a breather cap, but the WD45, with the battery ignition, has a solid cap, and a breather cap on top of the valve cover. Oil pan overfill could still be a problem, but I would look towards the blowby problem, indicating worn rings.

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02-18-2004 18:58:22

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 Re: WD 45 oil leak revisited - Help please! in reply to Jr64, 02-18-2004 04:50:04  
The breather cap already has steel wool inside to allow ventilation while minimizing how much dust can get into the engine. Closing off that cap even more does not solve the problem. You have excessive pressure inside the crankcase. Probably blowby from the pistons- excessive ring wear lets the compression past the rings.

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Nate in IL

02-19-2004 19:43:49

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 Re: Re: WD 45 oil leak revisited - Help please! in reply to JMS/MN, 02-18-2004 18:58:22  
There is supposed to be a metal baffle plate installed on top of the rocker mechanism to minimize oil splash in the top end. Is that plate installed or missing?

The plate is installed on the same studs that hold the rocker stands and the valve cover.


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