Re: [Amel Yacht Owners] Re: Onan genset trouble code "seven blinks"

Bill & Judy Rouse <yahoogroups@...>

I believe that one thing that many of us forget to do is clean the inside of the impeller housing before declaring the job finished with the impeller change. I also believe that the roughness of the inside of that housing which is caused by mineral deposits is the number one reason for short life of impellers.

It is easy clean it on the Onan if you remove the pump when changing the impeller...there is one bolt and another bolt and nut connecting the pump to the block. 

I use emery cloth or wet/dry sandpaper to clean the impeller housing. Before inserting the new impeller, feel the inside of the pump it perfectly smooth? I doubt it...polish it before inserting the impeller. Be sure to remove all of the grit from cleaning it. It should look shiny and feel smooth.


CW Bill Rouse
Admiral, Texas Navy
Commander Emeritus

Amel School
720 Winnie St
Galveston Island, TX 77550

+1(832) 380-4970

On Sun, Dec 17, 2017 at 7:49 PM, john.biohead@... [amelyachtowners] <amelyachtowners@...> wrote:

Hi All, 

  First thanks for all the advice, Especially Bill, Eric, Porter, Thomas,Mark, and Bob, you all are great!

  We have everything back on line now.  Will post some pics to FB later.  

Bill:  You are right as usual except, as you pointed out during my purchasing process when I sent you some photos (which you helped me with a lot, and I am indebted...) that the genset and engine were NOT original.  They were replaced by Amel in 2003 with the newer versions.  So yes I have the "no SW flow" sensor that Eric speaks of and yes Eric, I did remove it and clean out the port.  It think the post impeller change no SW flow was however caused by the 14 impeller vanes clogging the heat exchanger down stream.   My heat exchanger has an end cap with one bolt making it easy to remove and inspect...and pull vanes from :)

I think the previo us owner changed the impeller. some time in the past..and left some vane-debris in the flow path, I found fourteen vanes in the heat exchanger.  The new impeller has twelve....hmmm

Anyway, we were "down" for less than one hour...mostly thanks to having the right onboard spares...and Capt. Mcguver.

  Regards,  John

John Clark
SV Annie  SM 37
Moored (finally) in St.  Augustine Florida for Christmas.



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