Evinrude 4423, water pump

[davidk]

This 3.3hp motor has two rubber impellers with a deflector in between.  There’s a plate that has four holes that line up with studs on the housing but floats free. Was this plate originally riveted to the housing?

[Steve D]

I don’t know anything about those motors David but here’s the parts page that might help. I’m sure someone who knows these will chime in.

I have the manual ( I believe courtesy of Garry in days gone by) but it’s big and not sure if I can attach it. I’ll try in a separate post.

 

[Steve D]

Evinrude 4423-4424 Parts Manual – not that big, was thinking of the owners manual, will try that next.

1947-1951-Evinrude-3.3HP-Parts-Manual

 

[Steve D]

Evinrude 4423-4424 Owner’s Manual

1947-51-Evinrude-3.3-HP-Owner_s-Manual

[davidk]

Thanks Steve!  I had the parts manual but not the owner’s manual.  : )

In the parts diagram, it shows a “Deflector and plate assembly.”  Seems to be one piece.  I tried searching for that part number to no avail.  Let’s see what more info emerges.

[Gary H.]

Looking at your pictures, I would have to say that that top plate looks like it was attached to the lower housing. I don’t know if those are rivets going through the lower housing that are removable and are replaceable or if it was cast studs that stuck up and once the plate was put over it, the studs were peed down like a rivet head to hold the plate down. Once the impeller is pushing against the plate and rotating, you do not want the plate to spin. If it were to spin in the housing, it would wear out in no time.  Just my thoughts about it.

[davidk]

I think you’re right, Gary.  Thanks for your observations.

[tjlumpkin]

David, I am also restoring a 4423.   The two parts pictured are indeed supposed to be riveted together forming a space between the two.  This is a two stage centrifugal pump.  The lower impeller output flow goes between these pieces, directing flow to the inner diameter of the upper impeller (your first picture).   FYI,  I’m manufacturing replacement impellers and currently in the testing phase.   Once reliability and durability are proven,  I’ll make them available to 4423 owners.

[tjlumpkin]

Here’s a picture of the 2-stage pump water flow path.

[tjlumpkin]

Now available… 4423 impellers. Designed, manufactured, and tested in USA. Two materials available: HiPerf and OEM type.

HP: https://ebay.io/m/wGPTRm

OEM: https://ebay.io/m/ilG22j

[Author]

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