160 maxx pump

Joined
Jun 8, 2016
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5
Location
Michigan
#1
Brand new 160 maxx mag pump, with a 160 skat impeller. The pump has been bored to fit the impeller, but when i tighten the impeller down ti doesnt want to spin freely. I have tried 1 and 2 shim washers with the same results, anyone else run into this?
 

Christian_83

Xscream
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Joined
Feb 4, 2006
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1,080
Location
Denmark
#2
Why didnt you get the impeller machined to the pump?
Maybe your impeller has be re pitched and made the blades a bit uneven, making some of them snag.
 

Harbor

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Joined
Jun 23, 2013
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993
Location
Stockton
#8
Brand new 160 maxx mag pump, with a 160 skat impeller. The pump has been bored to fit the impeller, but when i tighten the impeller down ti doesnt want to spin freely. I have tried 1 and 2 shim washers with the same results, anyone else run into this?
Had an assembled pump & shaft go thru the packaging during shipping, shaft hit something hard. Anyways the pump stopped spinning, prop blade to pump bore was at least .003 yet still would not spin. Visually Inspecting further I found the hub of the prop apparently sitting on the pump stator veins. So I pulled the pump cone off and pressed the shaft back out if the pump slightly and it released the tension.. spinning ok now.. the shaft was into deep from getting bumped in shipping..

You can pull the pump cone off and hit the shaft with a fat brass punch and hammer a few times & see if it helps.
 

Harbor

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Joined
Jun 23, 2013
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993
Location
Stockton
#10
im thinking the boring wasnt done correctly, its a tight fit all the way down, my skat 144 mag pump defiantly wasn't this tight
I used a flash light first to visually see the prop to stator clearance, saw light all the way around. Then used a feel Ler gauge to verify what I saw.. have you tried either of these methods ?
 
Joined
Feb 22, 2015
Likes
52
Location
Uk
#11
Just to confirm, with prop off shaft spins nice and free?

If so and all turns on the way down just locks up at the end you might find the prop has been set back like 5mm and is still touching hub so needs a lot more spacers
 
Joined
Feb 22, 2015
Likes
52
Location
Uk
#14
But is the prop hub touching the hub of the pump. You will not be bale to see this as it sits inside the prop hub.

If you back the prop off a few turns and it slows it to spin it just needs more spacers.
 
Joined
Jun 12, 2011
Likes
201
Location
Southeast
#18
what was your solution. I have the prop fitted in the pump now, but it doesnt spin as freely as i would like, id assume it will loosen up some when it gets some use
I filed down the blades of the prop just enough to not drag, making sure not to go past the spec in the Yamaha service manual. Recently changed to a solas prop and didn't have any trouble with clearence to wear ring.
 
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