David,    Have been at that point many times with machinery, like yesterday I had  track come off one of my tractors-----  $30,000 replacement etc etc!  These things happen but have a good sleep and it will be fixable.  I will contact my local Guru, but I suspect it is either O rings or possibly a warped side plate.  To test you may be able to pressurise the housing with compressed air and listen for leaks.  Whatever, all is fixable and at a much lesser cost than replacement with something else.  I am making another engine to replace the original and that is growing into a 12 month project.   With so much committed to the rotary I will fix any problems just through stupidity or determination, which ever you call it??    I now have a new 3,12 G/box ready to test and my mate has special inserts that can be put into the rotor housings for little cost, so everything can be fixed.    Keep us informed.  Neil.

For Lynn and other rotary experts...  Sigh.  I jusy finished a rebuild because I started getting exhaust gasses in the coolant. ...  I assumed that I had melted a coolant jacket o ring (the Teflon ones that  RWS sells).  But now after replacing the cooling jacket o rings and other rubber stuff? I still seem to have the same problem.  Is it a warped rotor housing? Side housing?  Impossibe to guess without measurements?   I didn't bother with measurements because I dont really have the tools for the require precision.  

The symptoms originally came on fairly suddenly with no provocation (like overheating or something). ....  I just  suddenly lost most of my my coolant.

For the first time in the life of the plane I am considering throwing in the towel on the rotary engine concept, or at least my ability to manage it....