dougsnash
Joined: 14 Apr 2008
Posts: 281
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 Posted: Wed Aug 25, 2010 3:02 am Post subject: roughness Engine roughness |
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Hugh, I hate to be the barer of bad news but you just created a gauranteed, gonna fail again situation. NEVER tin a crimp on connection in a high vibration environment. It creates a stress riser inside the wire where the solder ends. This problem will return in fairly short order. When it does, it will likely look like someone cut the wire off just past the end of the solder you applied.
Essentially, there are solder type connections and there are crimp on connections but you should never combine to two techniques. Solder connectors have built in strain relief to support the cable.
Doug MacDonald
CH-701 Scratch Builder
Industrial Electronics technician (day job)
NW Ontario, Canada
QUOTE
I noticed also that the ends of the grey wires were not "tinned" before being crimped to the connector. They were just stripped and the connector plug crimped on the strands. This is very poor practice, and no wonder this type problem keeps showing up on these engines.
Anyway, I cut the old connector completely off, "tinned" the bare ends of the brown wire and and the red wire, crimped on a new insulated Male/female spade connector, secured everything and fired the engine up. Every thing is now working normal. She is "purring like a kitten"!
Going flying tomorrow!!
Thanks,
Hugh McKay
END QUOTE
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