Larry in Ark.
Junior Member
Hi guys. Working on '31 vacuum wiper motor. Can anyone tell me how they actually work? Thought they were pretty simple but... I put it back together, hooked it to a vacuum pump, turned the blade to the right with the switch on and the exhaust valve stuck to the vacuum. I shut the switch off on the wiper motor. I could turn the blade by hand easy. I cleaned all the air passages and lubricated all real well. Can't figure it out. Does anybody have one that works that they want to sell or one for parts??? I've got a good Heinze electric wiper if somebody is interested in trading.