It would be difficult for something big enough to do damage to your motor to get in there, but anything is possible. You shouldn't even worry about it since that possibility is so unlikely, but of course, get it replaced sooner rather than later.
Just to calm your concerns a bit, get a flashlight and shine it into the box the tube attaches to. The one that mounts on top. You'll probably see light dust, but not much more.
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One foot in the grave.