MERCURY KD-3 WATER PUMP

[joellerich]

I am trying to replace the impeller on subject engine. There is a brass disc in front of the impeller, held in by a “C” ring. I have removed the “c” ring but am unable to remove the brass disc. The impeller is behind the disc. Anyone have experience removing the disc ? Any suggestions welcome.
Thanks
John

[Buccaneer]

By brass disc, are you talking about the impeller drive dog? That appears to
have a C ring keeping a pin going through the drive shaft, in place.

Prepare to be boarded!

[joellerich]

The document you sent is what I need. The second page of the document did not come thru. can you resend or e-mail to john.oellerich1525@gmail.com
The disc I cannot remove would cover the impeller as shown in fig 3 It is held i place by a C RING.

[fifty20ne]

https://aomci.org/forums/topic/wizard-wd-3s-impeller-question/

Due to corrosion you may have to apply heat with a torch
To LU area to get case to expand, in order to get impellor
Cover off.

I used mechanical force and bent mine? (Not Recommended)

[fifty20ne]

Thankfully Joe has parts!!!!!

http://fergusonpoolemarine.com/enginecoolingsystem.html

[fifty20ne]

[green-thumbs]

The brass disc is a close fit so it does not take much crud to jam it in place. Line the pin up with slot on edge of water pump housing, then
push it out. If the pin is bent in an S shape it may be best to cut it with
a Dremel tool cut off disc or similar method. If the pin come out without
a problem, use 2 rods to pry up on impeller drive hub…that often is enough to do job. Extreme method is to SLAM the water pump housing
down on a wood surface so the inertia of the heavy brass disc pops it
loose. Both methods work, If may help to clean the gap between the
brass disc and the water pump housing as that may ease removal of
disc by either method.
Joe B is not a dyed in the wool Mercury/Wizard fan, but ,this little gem
went from flea maket find to star of the show status..
Louis

[joellerich]

THANKS: JUST WHAT I NEEDED. EVERYTHING ELSE ON THE ENGINE IS IN GREAT SHAPE.HOPE TO HAVE IT RUNNING THIS SUMMER.

THANKS AGAIN

JOHN

[opposedtwin]

This is the exact same gear case as used on the K3 model, correct? I am trying to get into the case on mine. Removed the C clip but the plate is tight.

• This reply was modified 5 years, 1 month ago by opposedtwin.

[fifty20ne]

Scott,

The Mercury 1940 K3 should use an oscillator (Hockey Puck) style impellor not a rotax style.
Does your intake have the 16 square holes like Sea King K1?

I would dissemble intake & prop shaft from lower unit and try a little heat on outside of aluminum
Housing using propane torch and try to press out using drive shaft Gently! i.e. light taps.

Reproduction impellor are available from Ferguson- poole

http://fergusonpoolemarine.com/

The Oscillator style pumps have a hole in cover
And the rotax vane style pumps have a slot in
Cover. (See Picture)!

[Author]

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