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

[John Wilkens]

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