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kitebuz

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Posts: 209
Reply with quote  #1 
I had this happen on my last two outings.  The engine has been running fine, but each time after a hour run, I got a crazy high over-temp alarm while idling.  I also have analog temp gauges, so was pretty sure I was not actually over-heating.  Still, it's concerning when you look down and see 302 degrees with an alarm going off...

I'm thinking maybe the water supply to the EMM is clogged, or maybe the engine temp sensor is going bad.  Before plugging into my EVDiag software, I quickly take a look to see where the temp sensor is & check the wires.  Lo & behold, I think I found my problem.  Both temp sensors wires on the port head chaffed thru rubbing on the coil.  I plugged in the diagnostic software which confirmed the temp alarm was from the port head.  It only showed 292.6 as max temp, but pretty sure I saw 302 on my instrument screen before shutting off the engine.  Either way, I'm hoping this solves the problem. 

What do you think - cut out the chaffed area & butt splice, or clean it up, apply liquid tape, and electric tape over?

Chaffed Thermo wire.jpg

steelhead

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Posts: 4,085
Reply with quote  #2 
With all that interior copper wire corrosion, I would replace the sensor and all sensor wiring back to the EMM.

Must be a salt water motor?  I see blue/green copper corrosion on the base mount of that coil also.  Check the coil ground wire for corrosion, these have to be spotless clean.

Use an anticorrosion spray serveral times a season.  How's the underside of the flywheel and it's magnets look, visually check condition of stator steel poles often rust and delaminte.
suzukidave

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Posts: 5
Reply with quote  #3 
where did you install an analog temp sensor?  i'd like to see a picture.
kitebuz

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Posts: 209
Reply with quote  #4 
Quote:
Originally Posted by steelhead
With all that interior copper wire corrosion, I would replace the sensor and all sensor wiring back to the EMM.

Must be a salt water motor?  I see blue/green copper corrosion on the base mount of that coil also.  Check the coil ground wire for corrosion, these have to be spotless clean.

Use an anticorrosion spray serveral times a season.  How's the underside of the flywheel and it's magnets look, visually check condition of stator steel poles often rust and delaminte.


Thanks for the input.  It does live in a saltwater environment, and is on a bracket, so I think sees more backwash at times.  I do periodically hit it w/ a light rinse & anti-corrosion, believe it or not.  The green you can see on the coil is right where these two wires were rubbing. 

I will be pulling the flywheel this winter to fully inspect.  I lost some magnets on the twin engine recently, and I want to be sure all these ones are secure & check corrosion.  


Quote:
Originally Posted by suzukidave
where did you install an analog temp sensor?  i'd like to see a picture.


There is a threaded insert at the top of the head you can screw in a temp sender & run it to the gauge on the dash.  

InkedEngine Thermo.jpg

steelhead

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Reply with quote  #5 

Additional corrosion outlined in blue, worth checking, spark coils are critical to E-TECs running smoothly
Much increased motor protection and troubleshooting info with an E-TEC engine interface cable to NMEA2000 network with E-TEC digital gauge such as Ico Pro speedo with code and parameter display and/or an E-TEC compatible MFD

InkedChaffed Thermo wire_LI.jpg 


kitebuz

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Posts: 209
Reply with quote  #6 
Quote:
Originally Posted by steelhead

Additional corrosion outlined in blue, worth checking, spark coils are critical to E-TECs running smoothly
Much increased motor protection and troubleshooting info with an E-TEC engine interface cable to NMEA2000 network with E-TEC digital gauge such as Ico Pro speedo with code and parameter display and/or an E-TEC compatible MFD



Oh yeh, if there's a gadget I can add - I usually do.  I have the analog temp & water pressure mainly for redundancy, and I like, especially on water pressure, for it to work regardless if there is an issue with my electronics.

I've got the nmea2k cable tied into both engines, and have two Evinrude icommand gauges, along with my Simrad head units, which I often dedicate one to an instrument panel.

 
suzukidave

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Posts: 5
Reply with quote  #7 
Quote:
Originally Posted by kitebuz

There is a threaded insert at the top of the head you can screw in a temp sender & run it to the gauge on the dash.  

InkedEngine Thermo.jpg



thanks.  i should have thought of that spot.  the previous owner had my engine hanging on two eye hooks threaded into that boss and the one on the other side when i bought it.  he looked confused when i pointed out the three bolts and a balancer puller in the flywheel option.  anyway, they held and hopefully the threads work.

i have a temp sensor rigged for my old 1994 so it will be nice to have an analog backup in  digital world.



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