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Yanmar 4JH2E raw water impeller
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2020-01-21 at 8:07:44 PM GMT
Posts: 18
Yanmar 4JH2E raw water impeller

I have returned to La Paz and getting ready to splash this week.  I am installing the raw water impeller. on a Yanmar 4JH2E  I have always tried to get the vanes to be installed in the right direction, but this is proving difficult.  Is it necessary or will the vanes pop round to the right direction once it is spinning?

And a supplementary question; I am on the hard with little access to water.   With the raw water impeller out of the raw water pump, can i test run the engine for 10 seconds or so?  I cannot see why not, but who am I not to ask the question on this forum.

Boats are always safest in a harbour; but that is not what they are built for.

Last edited January 21, 2020
2020-01-21 at 10:56:09 PM GMT
Posts: 40
In my experience with many different pumps it doesn't really matter as long as the impeller is not old. A new impeller should straighten itself out in short order. A little vaseline won't do any harm and will lubricate it until the water comes up. Allen Baja Magic Marina de La Paz

Cassiopeia -- Bavaria 42 -- Port Sidney Marina
Just Do It! - Jeanneau Sun Odyssey 35 -- Powell River
Both in the Cooper Boating fleet and available for charter

Baja magic --Beneteau 35 -- Marina Palmira, La Paz, BCS, Mexico
Carpe Diem Hunter 23.5 - Sudbury, Ontario

2020-02-23 at 1:10:30 PM GMT
Posts: 18
Allen -Thanks for that. A couple of things I have learned since from other forums. Put a cable tie around the impeller and tighten it down so that all the vanes are going in the right direction. Then coat it in something slippery; KY works good. With the compressed vanes, the impeller slips right in and you can slip the cable tie off as you push the impeller in.

Second, I started the engine without the impeller in the water pump and ran it for 5 seconds to prove that it would start before splashing. No harm, no foul. This was also mentioned in other forums.

Third, I "prefilled" the water system from the strainer with the raw water intake sea cock closed. Once in the water, I opened the seacock. This allowed for instant starting without having to worry about the water pump running dry for even a second. Probably overkill, but easy to do.

I am no in La Cruz preparing for my crossing to Hawaii and home. My sanity only allows me one boat so it goes where I am. You have four boats? that will keep you busy!
Thanks again,

Boats are always safest in a harbour; but that is not what they are built for.

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