  We investigate the nonperturbative behaviour of the quark propagator in axial
gauge using a truncation of the Dyson-Schwinger equations which respects the
Ward-Takahashi identity and multiplicative renormalisability. We demonstrate
that above a critical coupling $\alpha_c$, which depends on the form of the
gluon propagator, one can obtain massive solutions for both explicit and
dynamically generated quark masses. The stability of these is discussed in the
context of the Cornwall-Jackiw-Tomboulis effective action.
