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Baron Tach Problem

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frank3
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Posted: Mon Dec 02, 2013 4:19 pm Post subject: Baron Tach Problem

Today I was assisting local A&P problem solving a tachometer problem in a twin Baron.  Owner reports the tachometer for the left engine does not register RPM on initial engine start but does register normally after engine warms up.  We swapped the canon plugs to see if the problem would follow the connections.  To our surprise both needles registered properly on start up.  We swapped wires back to appropriate connections and the left needle did not register.  We swapped them again (left lead to right input and right lead to left input) and the right needle did not register on engine start while the left registered normal at engine start. In other words, we were able to duplicate owner's experience on this second attempt.  With engine running we wiggled the wires and disconnected/re-connected the canon plug.  Seemed maybe there was a very slight movement of the needle when re-connected but not sure.  After approximately ten minutes of engine warm up the right needle popped into action as if it became suddenly unstuck.  After changing oil we ran the engines and again experienced the same problem reported by the owner.

The A&P said he previously disassembled the left engine tach sensor when the owner initially reported the problem.  He found the bearings dry and repacked them.  There was no oil contamination.

All ideas/suggestions are welcomed.

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