Yanmar 1GM10 raw water pump help

[Earendil-uk]

I had the need to replace the impeller on my water pump and noticed a drip coming from underneath, after removing the whole pump and cleaned it I noticed that the impeller seemed to be off centre , is this normal please as I am hesitant to put it back until I know if this is ok to use.
Any advice would be welcome please.

 

[awol]

If you mean the vanes are curved on one side and almost straight opposite then that is how it is meant to be.

 

[sailorman]

there was a problem with the rubber becoming detached from the brass centre drive on some impellers

 

[Earendil-uk]

If you mean the vanes are curved on one side and almost straight opposite then that is how it is meant to be.

Thank you very much awol I was hoping that was the case.
Also thanks to Sailorman (a problem I was aware of )

 

[ghostlymoron]

If there's a drip from the hole underneath it means the shaft seals have gone. They need replacing.

 

[vyv_cox]

You may find this page of my website useful for water pump issues http://coxengineering.sharepoint.com/Pages/Waterpump.aspx

 

[JumbleDuck]

If there's a drip from the hole underneath it means the shaft seals have gone. They need replacing.

In which case it would also be worth giving a Good Hard Stare at the mild steel oil pipe which lies directly in the path of the warm, dripping sea water.

 

[Spi D]

Jabsco explanatory video:

 

[Burnham Bob]

Biggest problem I found with my 1GM10 water pump was that one of the bolts on the faceplate was almost inaccessible. Are they all evenly tight?

 

[Earendil-uk]

Thank you all once again.
I have removed the pump (had to use stud extractor to get bolts undone as bolt heads corroded ) removed both seals ,cleaned off shaft and internals, put in new seals,shaft and impeller (lube as I went along) so going down to boat to put back on making sure I torque on all the bolts.
As for that ill-conceived oil pipe that was replaced some months ago with a "rubber" pipe I made up for under a tenner ( not including the crimping tool that will come in handy for several other jobs on the list).
Notes by the way:-
Take off the crank pulley to get at retaining bolts.
if you have one take a stud extractor with you 10mm use the one that looks like a socket not those stupid drill hole and screw in type (some of the socket type ones may need part of the main body grinding down to fit in the gap ).
Take the bl00dy thing home to do unless you are well sorted at your boat.
Patience

Thanks again
Derrick