WIPER ARM CONVERSION

These are instructions regarding replacement of wiper arm from U3820A-N to U3821A-N. Your current wiper motor has a threaded tapered shaft on it and the wiper arm for this style shaft is no longer available. The wiper arm that we offer to replace the original requires a drum shaft. The new supplied wiper arm has an adapter with it. This adapter needs to be drilled out to 21/64” so it can fit over the threaded shaft. The adapter slides on the threaded shaft and needs to be welded to the shaft. A before and after picture is below. Prior to welding it is a good idea to shut off the main battery disconnect. You can remove the wiper motor if you wish. The drum will fit through the hole in the firewall but the grommet will have to be cut in one spot. After the grommet is cut it can be installed after the wiper motor is reinstalled.