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Nylon Clevises

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Old 07-22-2010, 12:25 PM
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tri-squire
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Default Nylon Clevises

How much heat can a nylon control rod clevis tolerate ? I have an OS.40 FP, which gets pretty hot, and the throttle clevis is very close to the cylinder casting, almost touching it. Will it possibly melt the nylon clevis ?



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Old 07-22-2010, 01:35 PM
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Default RE: Nylon Clevises

Welcome to teh RCU forums, tri-squire!

Here you have a link to physiscal properties of nylon:

http://machinedesign.com/BDE/materia...demat2_29.html

Your engine should not rise the temperature beyond 320~350 next to the glow plug only.
The rest of the cylinder and body should reach lower than that temperature in normal operation.

I believe there is no problem with your set up.

However, verify that there is no intermitent metal-metal contact (between pushrod and engine body), which creates radio interference.

Regards!
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Old 07-22-2010, 04:05 PM
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Default RE: Nylon Clevises

I concur, no issues as long as there is only intermittent contact. I use a nylon clevis on my throttle linkage and have never melted the clevis.

good practice to replace that clevis once a year because heat can embrittle the clevis pin which can then snap off under vibration. Just check it every now and again and replace every season, they're cheap enough
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Old 07-22-2010, 05:15 PM
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ChuckW
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Default RE: Nylon Clevises

I've been nervous about the nylon clevis too, especially close to mufflers. I have never had an issue though so I have come to the conclusions that they are just fine for the application.

As TimBle mentioned, periodic inspection and maintenance is always a good idea.

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