  The pieces of the hypernuclear strangeness violating potential due to the
pseudoscalar meson exchanges are derived using methods which were successfully
applied to hyperon nonleptonic decays. The estimates are tested by comparison
with measured hyperon nonleptonic decay amplitudes. All isospin changes $\Delta
I=1/2$ and $\Delta I=3/2$ are included in the derived potential. All
calculational methods used are reviewed and described in detail.
