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Does WD-40 swell plastic?

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Does WD-40 swell plastic?

Old 02-01-2018, 08:16 AM
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Default Does WD-40 swell plastic?

I have Revo-style slider driveshafts on my Losi Rock Rey that no longer well....slide!

I recently ran the vehicle in snow and before I put it up I sprayed some WD-40 on some components to keep them from rusting. The slider driveshafts got some WD-40 on them and now they take serious effort to slide over each other. If I lift the suspension arm it does not go back down because there is so much friction in the driveshaft keeping the arm in the raised position. Could the WD-40 have caused the inner splined shaft to swell?
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Old 02-01-2018, 08:32 AM
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That would depend on the type of plastic. It's also possible that some very fine dirt got washed into the drive shafts because of the snow/water/WD-40.

Take the drive shafts out and see if anything else is binding in the suspension. A little rust on a hinge pin could be causing some binding too.
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Old 02-01-2018, 08:37 AM
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More than likely dirt got in there.
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Old 02-01-2018, 08:41 AM
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any type of penetrating oil can swell rubber and plastic. More so rubber.
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Old 02-01-2018, 08:53 AM
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get a can of tri flow
been using it for years and never had any problems.
I works great for bearings and doesn't hurt the plastics.
The down side is it will mess with blue loctite if its not cured all the way.
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Old 02-01-2018, 03:21 PM
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Originally Posted by CNEPACE View Post
any type of penetrating oil can swell rubber and plastic. More so rubber.
yeup
you also need to watch out electronics with sprays. I sprayed some plastic safe silicone spray and it made the power switch swell just enough that the switch stopped working.
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Old 02-01-2018, 04:44 PM
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I completely disassembled the suspension system and eliminated the hinge pins, shocks, a-arms, or hubs. Took out the driveshafts and it's definitely the problem. Took them apart and they're clean inside and out. I even put some light gear grease on the sliders and that helped a tiny bit but they're still too tight to be usable.
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Old 02-01-2018, 04:46 PM
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Originally Posted by macnkitty2002 View Post
I completely disassembled the suspension system and eliminated the hinge pins, shocks, a-arms, or hubs. Took out the driveshafts and it's definitely the problem. Took them apart and they're clean inside and out. I even put some light gear grease on the sliders and that helped a tiny bit but they're still too tight to be usable.
Put'em in the freezer overnite and see what happens. Will probably shrink but don't know if they'll stay that way. Nothing to lose.
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Old 02-01-2018, 05:22 PM
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Try to lightly sand/file the holes to make more space, I guess.
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Old 02-01-2018, 10:08 PM
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I had this problem at work with nylon and crc spray(wd40)
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Old 02-02-2018, 05:45 AM
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Scrub the parts with Dawn dish liquid and then let them sit out in the sun, they will go back to their normal size.
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Old 02-02-2018, 06:45 AM
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I've been using Liquid Wrench Lubricating Oil to spray all my gear for years, never had any problem with plastic swelling with that stuff.

I like the idea of degreasing the plastic and letting them bake in the sun.

I've also seen some guys use Pledge to clean their plastic too.
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Old 02-02-2018, 06:56 AM
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I'll try degreasing the driveshafts to see if that does anything.
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