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draftsjust417(at)gmail.co
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 Posted: Sat Apr 18, 2020 7:45 am Post subject: tachometer troubles |
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Ok all, looking for additional tachometer advice...
In yesterday's flight, I noticed both front & rear tach gauges were intermittently erratic.
Both gauges read the same fluctuations (thanks to my backseat pass. giving updates as requested).
I've recently & thoroughly cleaned the Chinese-stock tach generator & front gauge's cannon plugs and reinstalled securely.
Both the tach generator & front gauge are only 5 yrs old, all stock Chinese.
Before I dive into the schematic & wire bundles, anyone hit this gremlin before?
Culprits to start looking for?
Successful experience stories appreciated!
Thanks,
Justin Drafts
N280NC
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markbitterlich(at)embarqm
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| Posted: Sat Apr 18, 2020 8:49 am Post subject: tachometer troubles |
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Yes, I have run into this before Justin but that said, I have no experience on CJ-6's so I have to make a few assumptions, one being that the design is close to the M-14. The first place to look is the tach generator cannon plug, On the M-14 the wires are soldered into the plug, and due to vibration those solder joint fractures. Carefully inspect and re-solder the wires into the solder cups in the plug and be especially careful with shielding. If the shield to those wires loses ground, you will have the worst radio noise imaginable, in fact so strong it burnt out the AGC stage in a stock Russian VHF radio.
Mark
p.s. Nothing wrong with trying some dielectric grease either as Dan suggested.
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