Was hoping that someone could help me to identify a couple of sensors on the
20B engine.  I scanned through the Haynes Manual but did not see any 13B's
with sensors like these.

First, there is a large sensor above each trailing plug.  I've attached a pic
so you can see what I'm talking about.  I did run across a diagram on page
122 of the 86-91 Haynes Manual that indicates that there might be a knock
sensor in this location.  Can anyone tell me definitively if these are knock
sensors?  I'm wondering because this seems like the ideal place to install
CHT probes since the holes are close to the plugs and are drilled down close
to the combustion chambers surface.

Second,  there is a small sensor that appears to be installed in a oil
passage on the plugs side of the engine.  Its toward the back and can be seen
in the same pic with the sensor described in the paragraph above.  I think it
is an oil temp sensor but still not sure.  It appears that this is the usual
location of a oil pressure sensor on a 13B but I'm pretty sure that this in
not a pressure sensor.  Again, any ideas would be helpful.  I have not yet
been able to identify a sensor that looks like an oil pressure sensor.

Thanks for your assistance!!!
Sincerely,
Don Mitcehell

That is a knock sensor Mitch. See the ACRE NL web site for
a schematic to listen for knock and or the CD for more info.

Paul Lamar
 
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