Richard,
I don't believe anyone answered your second question regarding placement of your water temp sensor.  That's very close to where I located my coolant sensor (engine outlet).   It seems to be working fine.

In regards to plugging the thermostat bypass, keep in mind that it is inside that cavity that you will get an airlock when filling your system.  You should provide a means of burping the air out of it or the pump will not be able to prime and you could burn up your engine before you figure out that you have a problem.  On my 20B there's a tapped hole through the pump casting to the outside that I remove when refilling the system until coolant starts running out.  That assures me that the cavity is filled with coolant and the impeller is submerged and will therefore pump coolant as intended.  A while ago, someone suggested drilling a small hole to allow the air to bleed off, but don't know for sure if anyone is flying that way. 

Mark S.

 At 08:37 PM 8/6/2004 -0700, you wrote:

We are planning on running our 13B without a water thermostat, and as I
understand it, the 1" hole below the thermostat (see attachment) should be
plugged.  Is this true?  If true, how?

Also I installed the water temp sensor as indicated in the attachment for
our EM2.  Good location?

Richard

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