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Old 11-08-2020, 16:02   #1
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Impeller size difference Yanmar

I have a 1983 Yanmar 2GM and have ordered three impellers from two different places and the new impellers are a fraction bigger in size than the original. The center brass bushings all fit snugly on the pump shaft, the hub of the rubber and the placement of the vanes are all identical to the original but the ribs at the ends of the vanes (the wipers) are a hair bigger than the original and thus the rubber has to flex in order to fit the impeller into the housing, not just where the rubber contacts the shoe. Should I be concerned about this? Thank you excellent sailors in advance! ♡
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Old 11-08-2020, 17:28   #2
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Re: Impeller size difference Yanmar

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Originally Posted by killyourguitar View Post
I have a 1983 Yanmar 2GM and have ordered three impellers from two different places and the new impellers are a fraction bigger in size than the original. The center brass bushings all fit snugly on the pump shaft, the hub of the rubber and the placement of the vanes are all identical to the original but the ribs at the ends of the vanes (the wipers) are a hair bigger than the original and thus the rubber has to flex in order to fit the impeller into the housing, not just where the rubber contacts the shoe. Should I be concerned about this? Thank you excellent sailors in advance! ♡

Could it be that the old one is somewhat "worn"?
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Old 11-08-2020, 17:32   #3
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Re: Impeller size difference Yanmar

This is normal. The vanes have to flex a bit to be installed
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Old 11-08-2020, 17:53   #4
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Re: Impeller size difference Yanmar

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Could it be that the old one is somewhat "worn"?
The old impeller does not appear to be that worn.
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Old 12-08-2020, 11:53   #5
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Re: Impeller size difference Yanmar

To start it in, I squeeze the blades with a tie-wrap and then cut it.
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Old 12-08-2020, 12:58   #6
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Re: Impeller size difference Yanmar

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To start it in, I squeeze the blades with a tie-wrap and then cut it.
That tight eh?
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Old 12-08-2020, 13:10   #7
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Re: Impeller size difference Yanmar

Will see what others say.Cheers!
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Old 12-08-2020, 16:46   #8
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Re: Impeller size difference Yanmar

if you review the user manual going to see in which direction need to be flex .
cheers.Hernan
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Old 12-08-2020, 18:15   #9
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Re: Impeller size difference Yanmar

pcmm is correct ... the vanes are meant to be flexed (curved) when installed. The tips of the impeller trail the hub following the direction of rotation. They naturally flip this way when the impeller turns - you don't need to worry about how the vanes lie when you fit the impeller.
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Old 12-08-2020, 19:15   #10
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Re: Impeller size difference Yanmar

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That tight eh?
Yep, and slather the whole thing with dish soap too. Some say use a grease, but I don’t as many “rubber” things grease softens.
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