Snip

       Paul my 13B Cosmo pump is not Kubota like 93+ 13BREW(series 6 down

under).

  The 13B Cosmo pump is same as 89-91 13B (standard rotation) using poly-V belt
  as previously posted.
      Kelly Troyer

Are you sure about the belt routing?
Paul Lamar

     Yes to belt routing. All pulleys for poly belt are ribbed and were intact as removed
 from car on my 13B Cosmo engine. The 93+ 13BREW RX-7 water pump pulley is smooth and runs
 against the flat back side of the poly belt in reverse rotation. All other accessories
 (alternator,air pump,pwr steering pump,etc)turn standard rotation.
    Kelly Troyer

So yours is like a 88-92. RX7 correct? I think the aluminum cartridges only
fits the 93 and up engines.
 Paul Lamar
 You are right Paul the 93 on pump cartridge will not fit the 88-92.

The 93 on housing will fit 88-92 engines.
I have fitted this to my engine but as my earlier message you will 
need longer studs in the engine.
 Regards Don

 
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