I'm workin on this guys tractor right now. (diesel perkins 4203) and he's got a nasty back fire through the intake/air filter.
As best as i can figure he's got valve trouble with the intake...but here's the catch....two cylinders (1 and 2 from front heading back) are only makin 100 psi a piece. the other two are to spec pullin in around 350 psi.
I've checked to see if the valve lash is playing a part in this,but near asi can figure that's not the guilty party.
WTF? any suggestions?
i'm tossin around a few things in the ol' brain box, anyone else want to piss in the pool?