Merc 140hp temp gauge fault

Post Options Post Options   Likes (0) Likes(0)   Quote Tonyg26 Quote  Post ReplyReply Direct Link To This Post Topic: Merc 140hp temp gauge fault
    Posted: 08 Apr 2020 at 5:26pm
Tonyg26 View Drop Down
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Long story but the impeller jammed so motor overheated.
Since fixed but the temo gauge never went back to cool. Power off it goes to zero but as soon as motor starts from cold the temo gauge reads overheating.
Any ideas. Sensor or gauge issue?
http://www.waikatosportfishing.co.nz
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Post Options Post Options   Likes (1) Likes(1)   Quote Motorhead Quote  Post ReplyReply Direct Link To This Post Posted: 08 Apr 2020 at 6:27pm
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Originally posted by Tonyg26 Tonyg26 wrote:

Long story but the impeller jammed so motor overheated.
Since fixed but the temo gauge never went back to cool. Power off it goes to zero but as soon as motor starts from cold the temo gauge reads overheating.
Any ideas. Sensor or gauge issue?

You could test the sensor with an ohm meter. Your outboard repair manual should have resistive values. This will reveal where the likely problem is.
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Post Options Post Options   Likes (1) Likes(1)   Quote RogueOne Quote  Post ReplyReply Direct Link To This Post Posted: 08 Apr 2020 at 9:58pm
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I'd guess that the overheated motor killed the sensor
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