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BitterlichMG(at)cherrypoi
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 Posted: Fri Apr 21, 2006 2:09 pm Post subject: RPM failure |
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Why of course Jerome!
Typically any kind of failure with the RPM indicator occurs because of failure to the solder joints in the cannon plug that attaches to the RPM Tach Generator. Usually this causes the RPM indicator to work backwards, or to be grossly inaccurate. If it fails and goes to ZERO... just as if the engine is not running... then it is possible that your tach generator itself sheared the shaft. The Tach Generator is very easy to remove, is on the left side of the M-14 engine, and has a segmented ring that simply unscrews in order to take it off.
Same thing with the cannon plug... you can take it apart easily and see if one or more of the wires inside have just fallen off. (Check this at the Tach Gen End)
It is UNLIKELY that you have a bad indicator. You did not mention what kind of airplane you are flying, but if it is a two seat model, you can usually just reverse the two indicators if one fails and the other one works.. but regardless.. the indicators rarely fail. 99 times out of 100, it is either the wiring on the Tach Generator cannon plug, or the tach generator itself.
There is a very good digital replacement tach that simply connects to the engine P leads inside the cockpit if you decide to replace the original design. Let me know if that is the case, and I will send you to the web site.
Mark Bitterlich
YAK-50 N50YK
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dsavarese(at)elmore.rr.co
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| Posted: Fri Apr 21, 2006 7:32 pm Post subject: RPM failure |
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Remove the connector on the Tach Generator. Open the connector and you will most likely find a broken wire. Very common.
Dennis
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