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Avoiding welded sensor / heater block with grease?


gdog

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Posted · Avoiding welded sensor / heater block with grease?

Has anyone used anti-seize grease on the termistor / temp probe, or more ideally a thermal paste such as what is discussed here:  https://www.rotax-owner.com/en/912-914-technical-questions/3068-spark-plug-anti-seize-vs-heat-sink-compound .  I get the idea that these will both transfer heat and lubricate, but then again maybe stuck termistors aren't a common occurrence? 

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    Posted · Avoiding welded sensor / heater block with grease?

    In the UM2, the sensors do tend to get stuck in the nozzle heater block assembly indeed.

     

    I have been wondering about that question too. In the chemical industry all bolts and nuts got some anti-seize paste (don't remember the formula, but its color looked like dull silver); and in car- and ship-mechanics, people tend to use copper grease on all steel bolts. This not only lubricates, but prevents corrosion too.

     

    So maybe copper paste would do? At least, it should give good thermal contact. But I don't know if the grease would dry out or burn out at 260°C, and maybe cause more friction than using nothing at all?

     

    As for the white computer heat paste: that paste often seems to dry out and get hard and sticky, or it crumbles, after a couple of years. So I am not sure if that would be a good idea? Also, I don't know if it can withstand 260°C? Computer chips generally should not get much hotter than hand-warm, if you want some decent life out of it. Except for a few high-power amplifiers that can handle higher temperatures. So you would really need to make sure the paste can handle those high temperatures for a long time.

     

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    Posted · Avoiding welded sensor / heater block with grease?

    As far as I can remember I put some copper grease on the sensor and maybe also on the heater itself, don't know anymore. I haven't dismounted the Olsson block since then, but it is working with copper grease.

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