Today's Message Index:
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1. 04:47 AM - Re: Engines-List Digest: 4 Msgs - 06/19/03 (Jerry Reynolds)
2. 04:57 PM - Re: Re: Engines-List Digest: 4 Msgs - 06/19/03 (Grant Corriveau)
Message 1
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| Subject: | Re: Engines-List Digest: 4 Msgs - 06/19/03 |
--> Engines-List message posted by: "Jerry Reynolds" <flyguy50@bluemarble.net>
> Time: 03:22:57 PM PST US
> Subject: Engines-List: Getting another Zodiac BACK in the air....
> From: Grant Corriveau <grantc@ca.inter.net>
>
> --> Engines-List message posted by: Grant Corriveau <grantc@ca.inter.net>
>
> ... the problem has to be in one of the Hall Effect sensors (or the
lead/wires from
> there to the computer)...>
>
> Grant Corriveau
> C-GHTF / HDS / CAM100
Grant,
Speaking only generically regarding Hall effect sensors and their
applications.. I have seen significant variations in sensitivity (output
switching versus distance). However temperature can also cause havoc,
without certainty as to the particular failure mode. Calibrated melting
paint sticks are available to determine if recommended temperatures are
being exceeded, but I would be more inclined to check that, with a new
sensor/new lead installed. If the gap is too small and the magnet is making
contact with the sensor, you'll probably generate a mechanical failure, and
I would not suspect it to be intermittent. But it would need to be resolved
regardless. Variations in gap can cause slight variations in switching
characteristics, up to and including non-switching as the gap is increased,
depending on sensor design. How much play is in the crankshaft? Check for
lead damage as well.
Jerry Reynolds
Message 2
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| Subject: | Re: Engines-List Digest: 4 Msgs - 06/19/03 |
--> Engines-List message posted by: Grant Corriveau <grantc@ca.inter.net>
> From: "Jerry Reynolds" <flyguy50@bluemarble.net>
>... How much play is in the crankshaft? Check for
> lead damage as well.
> Jerry Reynolds
Jerry,
I appreciate the information. As soon as I get time I will be changing out
both cables/sensors -- they weren't intended to be changed so this involves
supporting the front of my engine, detaching the belt drive and sliding it
forward enough to enable me to pull out the old units and thread in the new
ones, then assemble the plugs, heat shrink, etc.... One step at a time...
Probably the most likely culprit is a bad connector in one pin somewhere
that is affected by heat ... i.e. the cable grows just enough to make a
connection ground out or go high-resistance and that signal is lost. As
soon as it cools just a little, it returns to normal, so the problem is
intermittent. That is my 'most likely' guess.
Once the cable is changed and I'm flying again, I'll just have to 'push the
envelope' heatwise again, and see what happens. Hopefully nothing!
The good news is that the other channel works fine and has prevented any
off-airport landings.
Thanks again,
--
Grant Corriveau
C-GHTF / HDS / CAM100
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