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2012 RT 998 Water Pump Gear install - How is it driven?

Tarzan

Tarzan

New member
I am reassembling my motor and the water pump gear and intermediate gear don't seem to be driven by the balance shaft that the driven gear is on. can't figure out how it works. As far as the schematics go it appears I am assembling them correct. the weird part is that the water pump gear has a key way, but the gear slides down past the key on the shaft. And the gear aligns perfectly with the intermediate gear. I'll post some pics for reference. Both gears are in mesh with each other and spin together while the shaft is stationary. Maybe when the next gear, washer , and nut are torqued they figure that's enough to drive the water pump? No key needed for that?
Please let me know if anyone knows.
 

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Last edited:
Tarzan said:
I am reassembling my motor and the water pump gear and intermediate gear don't seem to be driven by the balance shaft that the driven gear is on. can't figure out how it works. As far as the schematics go it appears I am assembling them correct. the weird part is that the water pump gear has a key way, but the gear slides down past the key on the shaft. And the gear aligns perfectly with the intermediate gear. I'll post some pics for reference. Both gears are in mesh with each other and spin together while the shaft is stationary. Maybe when the next gear, washer , and nut are torqued they figure that's enough to drive the water pump? No key needed for that?
Please let me know if anyone knows.
Click to expand...

Something is clearly wrong in the second photo. The black gear is down below the key that is supposed to catch it.
 
Last edited by a moderator:
It can’t be up higher. It needs to mesh as it does with the intermediate gear. Then there is a keyed gear that goes on top of it that meshes with the crank gear
 
Tarzan said:
It can’t be up higher. It needs to mesh as it does with the intermediate gear. Then there is a keyed gear that goes on top of it that meshes with the crank gear
Click to expand...

Is there any chance that keyed gear on top has a protrusion that makes the lower gear turn with it too?? :dontknow:

Just Guessin' :rolleyes:
 
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