Jim, Ok, Here are the pictures.  I have decided to try to fix the broken rear side housing (broken trying to get off the flywheel nut) as I feel that I have enough rust out of the way so that water will flow.  The center housing I will also use because the large straight coolant passages made it easy to get out most of the rust and the rest is not causing any restrictions.  The one area where the jacket rusted through is on the outside and shouldn’t cause a problem because the pressure will always be away from the worn part.

 

The front side housing is going to be replaced.  There is a large internal passage I can’t get to very well with my rust remover (coat hangar) and picture shows how the coolant passage in one spot is toast.

 

Also note the patterns of rust.  For the most part, the submerged passages were not too bad, the dry passages were pristine, but the passages with fluid and air are very bad.

 

Thanks for the offer to send spare side housings.  My engine is a ’91 turbo (4-port).  I am about to order up a front housing from Mazdatrix so I can get it installed this week while I am on vacation.  But if you have one in good shape burning a hole in your garage floor I wouldn’t mind saving $400.

 

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