Calling All Wrenchheads

[Shuffler]

At high revs the crankcase pressure goes up which if the rings are bad causes oil to blow past them thus causing smoke.

That is correct to an extent. Many times I have found the following true. Under acceleration you would see smoke as the engine runs up higher RPMs to shift points. In cruise ,while the RPMs are up over idle, they are still low enough to not increase crankcase pressure over the ability of the venting capacity. Therefore at speed you won't see much if any smoke.

But who knows without looking at it... 

[rpm]

OK, got a bit more info on another forum. A Minitruck dealer says it's fairly common for them to smoke because they are shipped standing vertically in a container and oil tends to submerge the valve guide seals. Kinda makes sense to me, altho I would have thought the seals tougher than that.

I also found an OBD-2 connection. Now if I can just find an OBD-2 reader for the F6A engine.