Originally Posted by
Aussie Bob
I am going out on a limb here but is it possible that some Jabby failures are due to a machined crankcase? I am sure there are other engines using this method but I have never seen one. Even my lawnmower has a cast case.
Most crankcases are machined at some point in their manufacture. There's no real data to support this hypothesis, is there AB?
Originally Posted by
Arnold E
Since he is the one that knows the design intent.
The design intent and the design results are often worlds apart. There's normally a development process in between which is used to minimize the characteristic flaws in a design. All engines have their weak points, some more so than others. Many of these points are attempted to be fixed by ADs and recalls, if not by "maintenance" alone. Others become "character"