Roadster Wiper Motor Sealing
As the wiper bucket fills up, the wiper motor can become submerged and water gets in.
It's fairly common for the Roadster wipers to start going mental with no way to stop them.
Quite often it is because water has got in and has shorted something out.
Time to take it apart, clean it up and reseal.
Remove the bonnet and scuttle tray.
You can now see the wiper motor assembly. Unplug it and
remove the 3 screws holding the assembly to the car.
Remove the 2 Torx screws holding the cover on.
The cover will now pull free.
It's quite clear that water has been in here playing tricks. Use a wire brush (carefully) on the
motor section and clean everything else up with brake cleaner and switch contact cleaner.
This is what it is supposed to look like, no water ingress = nice and clean.
This is the gasket that has failed you. It is a 1mm thick 56mm inside diameter
rubber O ring. You can replace it if you can find one. a 2mm thick ring will work fine.
If you can't find an O ring of the right size you can revert back to your trusty polyurethane adhesive.
Apply a bead all round the outside after cleaning both faces, wait 20 minutes and then reassemble.
Put the whole thing back together and tighten down the bolts.
Refit the motor to the car and test. If the motors continue to go mad it could be
a faulty wiper stalk, water in the SAM unit or still a fault with the wiper motor.