  We study the phenomenology of a 5D $SU(3)_W$ model on a $S_1/(Z_2\times
Z'_2)$ orbifold in which the minimal scalar sector plays an essential role of
radiatively generating neutrino Majorana masses without the benefits of
right-handed singlets. We carefully examine how do the exotic scalars affect
the renormalization group (RG) equations for the gauge couplings and the 5D
$SU(3)_W$ unification. We found that the compactification scale of extra
dimension is in the range of $1/R\sim 1.5-5$ TeV. The possibility of the
existence of relatively low mass Kaluza-Klein excitations makes the
phenomenology of near term interest. Some possible bilepton signatures can be
searched for in future colliders and in neutrino scattering experiments with
intense neutrino beams. The low energy constraints from muon physics and lepton
number violating decay process induced by bilepton are also discussed.
  These constraints can provide new information on the structure of Yukawa
couplings which might be useful for future model building.
