Pion electroproduction on the 4He nuclei and p-odd nuclear forces

P-odd effects conditioned by weak electron-hadron interaction (at the expense of neutral and charged weak currents) are investigated for one-photon mechanism of e-+4He → e-+π0+4He process. P-odd effects can arise in scattering of non-polarized electrons if the produced pion is de-- tected in the e-+4He → e+4He+π0 reaction alongside with scattered electron. Different mechanisms of p-invariance distortion during γ*+4He → 4He+π0, where γ* is virtual photon are discussed in detail. Contribution of some pole mechanisms: exchange in annihilation channel by scalar epsilon-meson (p-parity is distorted in the electromagnetic γ*epsilonπ0-vertex), as well as exchanges in S- and U-channels by baryon resonances with J spin and P=Jsup(P)=1/2sup(+-) parity (for γ+N → N+π0 processes the amplitudes of which within the frames of pulsed approximation determine P-odd amplitudes of γ+4He → 4He+π0) is determined in the near-threshold region. These mechanisms result in P-odd pion production in the S-state, that increase P-odd effects near the threshold