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Giffen -
We blew our hall effect sensor that was in the inspection/pressure port of the right mag of our new IO-550N. Continental wanted $900 at at time, so we called Westach. They make the little sensor that is potted into the brass plug. We bought it for $45.00 (Hall effect sensor module for Westach 720-14RB), drilled out the old one using a burr and potted in the new one. Worked great with the Blue Mountain EFIS and now, even better on the GRT HX EFIS. We have 435 hours on ours, so hopefully our potting job was a lot better than the original. :-))
Ours was not difficult to get out if you rotate the mag. Didn't have to remove the mag to get it out or replace it.
Hope this helps,
John Schroeder
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On Thu, 31 Mar 2011 12:43:57 -0400, Steve Richard <steve@oasissolutions.com> wrote:
After only 300 hours, my sensor just fell out one day. The bonding material did not hold. To replace it through Continental was around a grand and required the removal of the mag. The call to Continental was to just satisfy my curiosity, since I use the Grand Rapids EIS for tach. The EIS does not use the sensor (uses p-lead). I have attached a wiring diagram. It insures that you don't lose you tach reading during a mag check.
Steve Richard
From: Lancair Mailing List [mailto:lml@lancaironline.net] On Behalf Of Giffen Marr
Sent: Thursday, March 31, 2011 8:14 AM
To: lml@lancaironline.net
Subject: [LML] RPM Sensing on TSIO-550w/Slick magnetos on a LIV-P
I am in the final stages of wiring the aircraft. On the Slick Mag's, there is a lower bung that can be removed to install a Westach 303D2HT sensor. It is almost impossible to reach and remove the bung to remove and install the sensor without removing the mag. I remember so discussion about sensing the RPM from the "P" Lead.. Any suggestions would be appreciated. The electrical system is 12 volts.
Giff Marr
LIV-P N229GM 90+
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