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PostPosted: Sun Dec 01, 2019 7:56 pm 
On the street
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Joined: Sun Dec 18, 2016 6:15 pm
Posts: 27
Location: Northern British Columbia
Country: Canada
Bikes owned: 72 GT750, 74 GT750, 75 T500, 76T500, 09 DR650
I've written before in this forum on damage that I discovered on the water pump cartridge. During re-assembly this weekend, I turned by attention to the old water pump. (I installed a new cartridge assembly that is still available from Suzuki). The guy who worked on this engine in the past I believe owned 4 tools:
-a hammer,
-vice grips,
-a Crescent wrench, and
-a big screwdriver that also doubled as a crowbar and a cold chisel.

It apparently did not occur to him that water bypassing to the tell tale hole might have meant a leaking mechanical seal. See the photo. A mechanical seal face and the carbon ring should be mirror smooth. On my 'J' these were as grooved as I've ever seen a mechanical seal. The only thing I know of that would cause this is running without coolant.

The guy probably used his crowbar to get the impeller off--and succeeded in cracking the impeller boss.
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