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Impeller change 2011-05-15
Changing impeller in
the sea water pump is not actually as hard as we thought. We felt quite
frightened as we believed that lot of water could flood into the boat
when the pump housing was opened. But with a little help and
encouragement from others who have done this before, we carried out the
operation successfully and kept the boat afloat. |
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1.
Before we
were going to do the impeller change we tried out the special tool
(provided by Yanmar) at home with the new impeller. Start by placing the
impeller as the picture shows. |
2. Screw the hollow bolt guide into the impeller as deep as possible but do not use excessive force to lock it in the impeller. |
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3. The next step is to insert the bolt into the hole... |
4. ...and
screw it until the hex head is aligned with the hollow bolt guide. This
is done to insure that the threads are okay and that you will be able to
use the tool properly. |
5. When
changing the impeller with the boat in the water, start by closing the
bottom valve. Then open the front to your engine and locate the pump
housing which is on a 370 in the right bottom corner at the front. |
 6. As you can see there is a label that recommends you read the manual. Do so if you haven't done it before or as with us who didn't have a clue what to do. |
7. Prepare
for the opening of the pump housing cover by having a small container to
catch the water which will most likely come out. |
 8. Here we demonstrate the use of a Finnish sauna/food/drink scoop that works quite well on a boat too. |
9.
The pump housing is now open and as you can see, all the "wings" are
still intact. The impeller was used for 2 seasons and there was actually
no damage. But scared by the discussions on the my Hanse forum we
decided to change it any way. |
 10. The hollow bolt guide is screwed into the impeller. |
11. The bolt is inserted in the
guide. |
 12. Using a proper tool the bolt is screwed clockwise... |
13. ...this slowly pulls the impeller out
of the pump
housing. |
14. The empty pump house. Inserting a new impeller is very easy, fold
the wings by using a rubber band or a thin line, insert the impeller and
cut the cord/line and pull it out.
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