My 3QM30 is also a Sen-Dure conversion.  What Chuck said…

David F. Risch
Managing Director
Great Benefits USA
401-419-4650 - Direct Line
[https://docs.google.com/uc?export=download&id=1iPWGeVIdWdypHSMZPtJX0mxirxyZ4ZBN&revid=0B9uSW32EcB8tZGxlWW1OMlJ6MXU0bmVaaFByQmlSVDMrOWNVPQ]
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From: CnC-List <cnc-list-boun...@cnc-list.com> On Behalf Of Chuck Gilchrest via 
CnC-List
Sent: Monday, August 3, 2020 11:19 AM
To: cnc-list@cnc-list.com
Cc: Chuck Gilchrest <csgilchr...@comcast.net>
Subject: Re: Stus-List Water pump

Many C&C yachts with Yanmar 3GM and 3HM diesels we’re actually fitted with raw 
water cooled engines, outfitted at the C&C factory with a Fresh Water 
conversion kit made by Sendure.  This was a cost savings  for C&C.  Those 
systems use the Yanmar belt driven water pump as a fresh water pump mounted low 
on the engine and have an added Jabsco belt drive pump for raw water system 
mounted higher up. Both use rubber impellers (not great).  Factory Yanmar 3GMF 
and 3HMF use metal impellers on the circulation side and the pump mounts up at 
the thermostat.  The rubber impellers are not ideal as a circulation pump as 
the coolant temperatures are significantly higher than experienced on the raw 
water side.  I’ve also experienced bearing failures with the Yanmar pump which 
costs upwards of $600.
Chuck Gilchrest
Half Magic
1983 Landfall 35
Yanmar 3HM



On Aug 3, 2020, at 10:54 AM, ALAN BERGEN via CnC-List 
<cnc-list@cnc-list.com<mailto:cnc-list@cnc-list.com>> wrote:

Mazen: I don't think you have a 3gm. Jon's pictures of a 3qm are more likely 
what you have.

Alan



On Mon, Aug 3, 2020 at 6:29 AM JP Mail via CnC-List 
<cnc-list@cnc-list.com<mailto:cnc-list@cnc-list.com>> wrote:
Upper is coolant pump. Lower is raw water pump.
Go here for a pic:
https://psyberspace.com.au/yanmar/anatomy.htm<https://urldefense.com/v3/__https:/psyberspace.com.au/yanmar/anatomy.htm__;!!LIr3w8kk_Xxm!5GNaFYai5HjvmBs6CvRLww2EF4nl6Fqx0hEMhbaI2LCZGvRjoCGO1YnZD3qMPToa3SQ$>
Jon
35-3
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