We have calculated exchange corrections for nuclear muon capture by 3 He leading to the 3 H final state using the hard-pion model and realistic nuclear wavefunctions. These currents modify the vector and axial part of the weak nuclear current. In their absence the rate is 12% smaller than found by experiment.Our final result for the rate is 1502 ± 32 per second. For the analyzing powers we find A v = 0.515 ± 0.005, A t = −0.375 ± 0.004 and A ∆ = −0.110 ± 0.006. These predictions use the PCAC value of g P . The variation of the observables with g P is also reported.

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