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      The future of the JD Forum   07/31/18

      Thank you all for your participation on the JD Forums.  We have enjoyed answering your questions, providing project advice and technical assistance on this forum for a number of years. We believe that there are now better ways to provide this service for our customers and the community. With that in mind, we have made the difficult decision to discontinue the Jamestown Distributors Forum.   Our JD Tech Team is committed to being your trusted technical resource, and we encourage you to reach out via email, phone, social, product reviews, and to post questions using the Q & A 'Ask A Question' function on all product pages. Additional information can also be found on product page Technical Data Sheets (including detailed usage instructions and application data).   Thank You Jamestown Distributors 
Little Harbor

Diesel Engine water temperature gauge problem

2 posts in this topic

Using an infrared  thermometer pointed to engine block right next to sender i read 171 degrees.   What would be a good estimate for the difference between the block temperature and the adjacent coolant?  

My water temperature gauge is reading high and seems to be dependent on the input voltage.  If I provide an independent battery  (12.15 volts)  with the battery ground tied in to the engine block ground the gauge reads 185.  If i use the ships electrical system with alternator running (14.46 volts)  I read 200 degrees . This happens with 3 different gauges.  If the gauges are used on the generator system they all read correctly.    This all happened after a 3 month boatyard haul out.  Also when the voltage is read from sender post to ground post on the instrument I read 4.68 volts.  When I take thee same voltage reading on my generator water temperature gauge I get the same reading, but the gauge is reading 280 degrees.

Any ideas?

 

 

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