  We study the generation of neutrino masses in the $SU(3)_W$ electroweak
unified theory in $M_4\times S_1/(Z_2\times Z'_2)$ spacetime. By appropriate
orbifolding, the bulk symmetry $SU(3)_W$ is broken into $SU(2)_L \times U(1)_Y$
at one of the fixed points, where the quarks reside. The leptons form $SU(3)_W$
triplets, localized at the other symmetric fixed point. The fermion masses
arise from the bulk Higgs sector containing a triplet and an anti-sextet. We
construct neutrino Majorana masses via 1-loop quantum corrections by adding a
parity odd bulk triplet scalar. No right-handed neutrino is needed. The
neutrino mass matrix is of the inverted hierarchy type. We show that the model
can easily accommodate the bi-large mixing angle solution favored by the recent
neutrino experiments without much fine tuning of parameters. The constraints
from $\mu\ra 3e$ transition and neutrinoless double beta decays are discussed.
