Jinma 204 (TY290) temp issues

[Catch95]

I took some temp and resistance readings - hope I did that correctly. I also drained some water from the block to test the temp in that.

After working it for an hour and gauge hard into the red. Gauge: 120. Radiator: 75. Block water: 68. Ohms 30. Engine didn't feel or smell hot. Radiator cap ok to touch.

After running for 20 mins - Gauge: 90. Radiator: 56. Block water 50. Ohms 35

Does that make any sense? tempted to put in a mechanical temp gauge as the electrics on these are always playing up.

I'm going to pull the gauge cluster and check those next. Got distracted with a sick calf that got bitten by some ticks. Not sure if it will make it yet. Lost one last year as well. Trying vitamin c injections.

Thanks

Mark

 

[quicksandfarmer]

This site has ohmmeter readings:
http://johnstractor.homestead.com/files/MeterReadings.htm

They report 7 ohms for the temp sensor cold.

 

[Catch95]

Thanks for that - very helpful. On a cold engine with ambient air temp of 30 degrees C (86 F) the OHM reading was 50 (or 5). So the chart suggested 7 ohms at 70 F. My sensor then read 3.5 at 56 degrees C in the radiator, then 3.0 at 75 degrees C.

So the higher the temp, the lower the OHM reading. Is that what I should be getting?

In which case that suggests the sensor is ok and is an issue with the gauge. I've done the test on grounding the sender wire (which pushed the gauge hard over) so I guess that suggests a bigger issue with the gauge cluster. Maybe a bad earth.

Am I on the right track?

Thanks for your help

Mark

 

[Catch95]

Final update on this.

Gave up on the Jinma gauge and put in a mechanical one. For those of you in Australia, a Speco one with an adaptor to the right size to screw in the sensor did the job. Reading is consistently around 80-90 degrees C which is where I understand it should be be. Pretty warm here at present so happy with that.

So running nicely with its new head gasket and new radiator!

Thanks for all your help.

 

[doxford jim]

I think the Jinma's are a tough little tractor and pretty good value for the money - at least here in Canada. I only paid about 25% of what a major brand tractor would cost in 2007. Tractor was $9800 US and FEL $3500 and both were new. I don't think you can beat that. What problems I have had have been relatively minor or slef inflicted. For the money I would buy another Jinma or a Dong Feng.