  A possibility to search for a heavy isosinglet (sterile) neutrino using its
decay mode $\nu_s \to l^{\pm} + 2 jets$ in the $S$ - channel production $pp \to
W^* + X \to l^{\pm}\nu_s + X$ in the CMS experiment is studied. The only
assumption about the heavy neutrino is its nonzero mixing with $\nu_e$ or
$\nu_{\mu}$. The corresponding CMS discovery potential expressed in terms of
the heavy neutrino mass and the mixing parameter between the heavy and light
neutrino is determined. It is shown that the heavy neutrino with a mass up to
800 $GeV$ could be detected in CMS. We also investigate the production of the
heavy neutrino $N_l$ mixed with $\nu_e$ and/or $\nu_{\mu}$ in the $SU_C(3)
\otimes SU_L(2) \otimes SU_R(2)\otimes U(1)$ model through the reaction $pp \to
W_R + X \to l^{\pm}N_l + X$ with the same heavy neutrino decay channel as
above. We find that for $M_{W_R} < 3 TeV$ it is possible to discover the heavy
neutrino with a mass up to $0.75 \cdot M_{W_R}$.
