[AT] stuck good on a WD 45 engine question!

william.neff.powell at comcast.net william.neff.powell at comcast.net
Tue Dec 12 06:36:48 PST 2006


John,

You said new valve stem seals on the exhaust valves.....? Wouldn't you be putting them on the intake valves? It's the intake valve that usually introduces the oil problem into most combustion chambers by sucking the oil down the stem.... I guess if the oil is running down it will produce some smoke...  But, your plugs are fowling, so the oil is getting into the chamber, must be coming from the intake side (or up from the rings)... If the oil was coming in from the exhaust side after combustion, you would not have a fowled plug. If you took the guides out of the head make sure you did not mix up your guides.....  

I have found that typically the exhaust valves don't have seals, there is always positive pressure on the exhaust side. I would think that an oil seal would also burn up on the exhaust valve....

Regards, 
Will


 -------------- Original message ----------------------
From: John Wilkens <jwilkens at eoni.com>
> That was the first thing we considered Mark.  I did't measure the 
> stem clearance but they seemed to be in better shape than other old 
> tractor engines I've done valve jobs on and never had any such oil 
> problems with ones that  were worse.  ....And we put new valve stem 
> seals on the exhaust valves.   John
> 
> 
> 
> At 05:07 PM 12/11/2006, you wrote:
> >Sounds like a worn valve and/or valve guide. What was the diameter of the
> >valve stem and the inside diameter of the valve guide when the valve job was
> >done?
> >Mark
> >
> >----- Original Message -----
> >From: "John Wilkens" <jwilkens at eoni.com>
> >To: <at at lists.antique-tractor.com>
> >Sent: Monday, December 11, 2006 4:55 PM
> >Subject: [AT] stuck good on a WD 45 engine question!
> >
> >
> > > My neighbor an I are super expert tractor mechanics :)  but we are
> > > stumped and need ATIS help!    Got a WD 45 with even compression at
> > > 119 lbs and good oil rings....no blowby problem and a fresh valve job
> > > (superior quality of course), and a good tight head gasket.    The
> > > problem with this tractor is that it blows enough oil out the exhaust
> > > pipe to make your face greasy if your're facing a headwind.  It all
> > > seems to be coming from cylinders 3 and 4...which are fouling
> > > plugs.  We put valve stem seals on the exhaust valves, but still it
> > > blows oil and smoke out the exhaust pipe.  It seems to me that the
> > > only place for engine oil to get into the exhaust system would be
> > > within the head somewhere.  Question is....Where or How?   We are
> > > just now going out to plug the oil feed pipe to the head and run it
> > > awhile without oil feed to the rocker arm to see if the smoking
> > > problem changes any.....but even if it does....where would be the
> > > problem.....a crack somewhere in the head?  It is blowing too much
> > > oil for a hairline crack we maybe can't see.     ANY IDEAS WELCOME
> > > PLEASE!     John W.
> > >
> > >                     In the wide-open spaces of NE Oregon
> > >
> > >
> > >
> > > _______________________________________________
> > > AT mailing list
> > > Remembering Our Friend Cecil Monson 11-4-2005
> > > http://www.antique-tractor.com/mailman/listinfo/at
> > >
> >
> >_______________________________________________
> >AT mailing list
> >Remembering Our Friend Cecil Monson 11-4-2005
> >http://www.antique-tractor.com/mailman/listinfo/at
> 
> 
>                     In the wide-open spaces of NE Oregon
>    
> 
> 
> _______________________________________________
> AT mailing list
> Remembering Our Friend Cecil Monson 11-4-2005
> http://www.antique-tractor.com/mailman/listinfo/at




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