1 GM raw water impellers

[Barry]

I have had to replace the raw water impeller twice in the past 8 months on our 1 GM.Both times the rubber blade structure unbonded from the center brass bushing. Thesewere both new impellers from Yanmar. Someone said they heard there was a bad "batch"of impellers. Has anyone else had this experience? I am trying to contact Yanmar, butso far no response. Thanks.

 

[Lyn]

Mack Boring

Did you purchase through Mack Boring? They're a distributer for Yanmar. If not,give them a call. The web site is www.mackboring.com it should have locations and phone numbers near you.

 

[Harry A.]

Have had the same problem

I had the same thing about a year ago. Minehad been in service two or three months, my dealer said that's just the way they sometimes go. I replaced it and the new one has been fine. But now I always keep two spares onboard.

 

[Henry Weber]

faulty Yanmar impellers

Had exactly the same experience after about 6 weeks on the raw water pump impeller. Was able to successfully re-bond the rubber to the inner bushing with epoxy. . . . But I still would keep a spare on hand. Henry

 

[Barry]

Thanks to all responders

Found a local mechanic through Mack Boring that confirms that 1GM impellersmarked with the "Johnson" name tend to go bad, but no one at Yanmar hasanswered my queries. The local also suggested that any blockage or backpressurein the cooling system could be a contributing factor to the failiures, so this weekend I am going to try flushing the engine, hoses and inspecting the thermostat.To Henry from Boca (small world - we used to live in Boca, until IBM decidedthe sun was to hot...) how did you epoxy the impeller, since I have two oldones now and they are $16 apiece I'd like to repair them as emergency spares.Thanks.

 

[William Church]

Yanmar Impeller

Had exactly the same experience as you did with the Yanmar impellers. I was replacing them every 40 hours on average. A Yanmar distributer told me that many of the impellers sold where defective. I keep two spare on hand at all times, just in case. I've had better luck this season although, got about 60 hours on this one. Maybe they fixed the problem.

 

[Henry Weber]

impeller repair with epoxy

BarryI believe I used MarineTex applied with a q-tip to attach the rubber portion to the metal bushing or center part. Yes, know IBM only too well since I worked there at the Boca Lab from 1969 to 1986. May have been too hot for IBM but it continues to be a great place for sailing.Henry