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1477Re: [j4x-owners-group] J/46 engine overheating

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  • Bernard Coyne
    Jun 17, 2014
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      Nice to hear from you Waddy!   And thank you for the info.   Are you planning on being up in Maine this summer?


      Bernie Coyne

      Sr. Technical Marketing Manager, DevOps
      IBM Software Group, Rational

      Innovate 2014                              DevOps For Dummies - Your free guide to faster, continuous software delivery

      From:        "sailgarrett@... [j4x-owners-group]" <j4x-owners-group@yahoogroups.com>
      To:        j4x-owners-group@yahoogroups.com
      Date:        06/16/2014 05:30 PM
      Subject:        Re: [j4x-owners-group] J/46 engine overheating
      Sent by:        j4x-owners-group@yahoogroups.com



           I had similar overheating on my J 46 (# 28) for the first several years I owned her. I did install a one inch thru hull and hose. I also removed the slanted grating at the entrance of the thru hull.
           I change my coolant every 1000 engine hours, or every two years, whichever is first, with extended life coolant. I have my heat exchanger inspected when I change the coolant and perform a Rid Lyme flush if needed.
           After 8 years, I replaced my engine heat exchanger.
           I have no overheating problems under 3000 RPM, unless I am in very warm water such as the Bahamas or Florida, or the Chespeake in the summer. In those warm conditions, I cannot go above 2800 RPM without overheating.
      In a message dated 6/16/2014 4:18:17 P.M. Eastern Daylight Time, j4x-owners-group@yahoogroups.com writes:
      For some time our J/46 hull #10 engine has overheated if rpm’s exceed 2500 rpm’s.   We also notice lots of air bubbles in the strainer at all rpm’s.  I now want to get this fixed.  Our mechanic has pointed out a couple of potential causes that I wanted to run by the group.
      1. Yanmar spec for our engine calls for a 1” raw water feed, yet our boat only has a 3/4” hose feed.  I checked a late model J/46 and they do indeed have a 1” feed.
      2. The bubbles in the sea strainer could indicate an air leak at or before the strainer.
      So I would like to hear from other J/46 owners to learn if they have or had similar overheating engine problems and also what size raw water hose you have and your hull # please.
      Many thanks,
       Bernie Coyne
      Mystic Rose J/46 #10

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