That's good. Should be lighter than the  cast iron Toyota pump.
It uses the lighter weight 1988 and older cartridges
which are also cheaper than the 89 and later cartridges.
The impellers are identical except the shaft is 19 mm instead
of 17 mm for some strange reason. Perhaps Mazda used
a larger fan on the 89's and found the bearings were not up to it.

Also there is one more hold down bolt. Could have something
to do with the larger fan. Both cartridges fit the casting
but you will have to weld on a couple of extra  bolt
bosses if you use the 89 and later cartridges. Not the third
gen cartridge as that is very different.

As far as fitting the front housing is concerned this is not an issue
as the pump is not mounted on the front housing of course.

I bought that new 91 cartridge from Mazdatrix and it was cheaper
than a rebuilt cartridge from the auto part store
chains. It cost something like $80.

Paul Lamar

Phew, I'm in luck; the oddball hybrid motor ("Mostly" 3rg gen) I had Bruce build for us has the
right cartridge!
...Chrissi

Saved yourself a few bucks there :)

Paul Lamar
 
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