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Hi, my name is Kerry
The impeller goes in the bottom part of the upper gear-case, there are 4 bolts with 3/4" heads.
Once you remove the drive and separate the upper from the lower, you remove the 4 bolts and the pump housing fom
the bottom of the upper gear-case.
I will search for a parts diagram, the site I usually use doesn't have pre-cobra parts any more.
Here is a diagram
The impeller is # *****
To seal the pump properly on re-assembly, you need Permatex #2 and you need to completely remove all
old sealant from the parts you re-use.
Let me know if you have more questions.