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Tool Talk Discussion Forum

Re: Remote temperature gauge???

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MarkB_MI

08-01-2013 03:53:32
75.198.75.116



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How do you come to the conclusion that the temp gauge is reading too hot? How can you determine the actual coolant temperature with your IR thermometer? The IR device determines temperature from the energy radiated by the exterior of whatever it's pointed at. You can't read the actual water temperature inside the water jacket of a closed cooling system.

The sending unit is located in the head for a good reason: If it were located lower on the engine, when the cooling system loses pressure the temperature will never get over 212F until all the coolant has boiled out. Since 212 is within the normal range for a pressurized cooling system, you wouldn't notice the overheating before there is damage to the engine. By placing the sender in the head, once enough water is lost that the sender is "dry", it will indicate cylinder head temperature rather than water temperature, making the overheating obvious.

You might want to pressure test your cooling system.

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Diydave

08-01-2013 16:50:12
96.244.160.72



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 Re: Remote temperature gauge??? in reply to MarkB_MI, 08-01-2013 03:53:32  
More background: This is an AC d-12 with a 149 CU in gas motor. Sending unit is located top of head, right over #4 exhaust port. Manifold is about an inch down, and an inch from the sender's side. On the 160 motor, I think the sender is moved to the thermostat housing, IIRC. I Checked the temps all over both sides of the motor, with the IRT, no major hot spots, consistently -40 F. Gauge was put on maybe 10 years ago, so If it is bad, I would rather mount the sender somewhere else, but there is no other spot, less'n I drill in to the block somewhere, and I don't want to guess at that.

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Dusty MI

08-01-2013 17:43:45
76.250.62.134



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 Re: Remote temperature gauge??? in reply to Diydave, 08-01-2013 16:50:12  
Quoting Removed, click Modern View to see

I have the same engine in a D-10. I've never worked it hard, it's mostly road driven. I had to put a new temperature gauge on it, It's one piece, the sensor and gauge with a tube between. It works fine for me.

Dusty



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