Can anyone give me some details on the wiper motor switch? Should it turn a complete 360 degrees? How does it shut off the vacuum to the wiper motor? I need to try to determine if my wiper motor as well as the switch works. Any help would be appreciated.

To give some details, I have had this car for about a year now, and it had not be driven or started since the mid 1960's. I started it up for the first time yesterday and let it run. It actually ran well, but the idle was a bit high. I need to make some adjustments on the carb. I have already gone through the fuel system, braking systems and and cooling system to make it road worthy. Car has only 39K on it.

Thanks for any help

The wiper motor switch is located to the right of the steering column on the bottom flange of the instrument panel and it is actually just a vacuum control valve. The more the control knob is turned the more vacuum goes through the control valve and the faster the windshield wiper works. When the control valve is shut off there is no vacuum so the wiper motor is deactivated.

The wiper motor gets its vacuum from the vacuum port on the intake manifold and the vacuum goes through the vacuum control valve on the instrument panel and then to the wiper motor.

Thanks for the info, I was wondering what that little assembly was for. I was looking at the wrong knob thinking it was for the wiper control.

Let me ask a stupid question. Directly above the windshield on the inside and inline with the steering wheel is a knob which I thought was for the wiper mtor. The wiper motor is directly opposite it only on the outside of the car. What is this knob for? What does it do?

Unrelated, on the drivers door, inside door panel is a small toggle. Is this a lever that locks for the drivers door? My drivers side outside door handle is broken so I can not test my theory.

The knob above the windshield is for raising the windshield and the small switch looking thing is the door lock Be careful with the windshield knob the gears that do the work are pot-metal and could be damaged easy. I sent you a PM.

I thought my windwhield was permanently in place, I did not know it rolled up. How much does it move? The gears in the knob I beleive are already shot, it turns 360 degrees fairly easily with no movement of the windshied

The windshield regulator has a big window crank handle that looks like the inside door window crank handle, and this handle raises and lowers the windshield. The windshiled raises up 3 inches.

This question concerns the wiper control on the dash of 28s, 29s, and maybe 30s? I have one that will turn left past the off position, like on a 53. On the 53 that position parks the wipers. How does this PARK position work? does it bleed off the vacuum or what?

MrMack, I don't know about the other years, but the 1928 does not park automatically. When you shut off the vacuum at the switch the wiper stops when it has no more vacuum. It must be moved manually to a parked position. If you are real good with the wiper switch you can get it to go to the park position and quickly shut off the vacuum.

Same for 1929 and 1930.

Thanks Guys, I have been playing with the control and noticed that when the valve is turned Cw it does open to allow more vacuum to the wiper and when turned to the left (CCW) it shuts off the vacuum and when twisted harder CCW it releases the vacuum in the line to the wiper motor. It does make the wiper motor easier to move the blade to the far left side of the windshield when the vacuum is released from the line to the wiper. I am still using the Model A wiper motor I have considered replaceing the tiny 1/8" copper tubeing from the dash up to the wiper motor. It may be restricting the vacuum volume, it is original. I still have the new old stock $79 1928 Chevrolet wiper motor put safely away for a really, really rainy day, know what I mean?

I am not sure what happens on my wiper control for the 53 except when the knob is twisted all the way to the left (CCW), but the wipers park fast.

MrMack I would think you should be able to snake a thin wire through the 1/8 tube to check for restriction

MrMack,

I've replaced the vacuum line between the control valve and the wiper motor on two 28's. Both had 3/16" copper tubing.

The vacuum control valve operation, as you describe it on your '28, functions in reverse to any '27-'28 vacuum valve that I have. On mine turning the valve CCW allows vacuum to flow and turning it CW shuts it off. There is no over center operation, it's either on or off. The stem of the control rod is a simple needle valve that closes against the inlet port. With the valve out of the vehicle you can look into the outlet port and see the needle portion move to and from the inlet port.

Most 27 and 28 original wiper control valves that you find are junk. The valve body is usually broken at the threaded area where the instrument panel attaching nut is located. Over time the pot metal swells and then breaks when you attempt to remove the nut.

I don't think that the wiper control valve on my 28 is original. It has a home made adapter to connect to the vacuum in and out tubing. I have a used one some place that I bought form Walt D.

On my 29 you turn the valve CW to shut it off and of course CCW for on. Just put it in from Stanley's

Andy, is this a new repo wiper control?

Andy, thanks for mentioning Stanley's Parts. I had forgot that he has a parts list on his web page. I went there and noticed that he has a seperate listing for a 1928 wiper control than the one for 27,29 and 30. Anyone know what is different about the 28 than the 27,29, and 30?

The basic valve is the same but the knob on the needle is different. The '28 knob matches the choke cable end. The '28 valve is mounted to the right of the steering wheel and the others to the left. That is for the passenger models. Trucks and Commercial vehicles are "another kettle of fish".

Yes it is a new REPO and Chipper on my 29 it is located just off to the right of the steering column.

On both the 1929 and 1930 passenger cars the wiper control valve is located to the right of the steering column on the lower flange of the instrument panel.

Dog what do you call the lower flange/ When the valve is mounted the part you turn faces to the rear are you saying it faces to the floor I'm just not sure.

I should have been more specific in my above posting since I mentioned the flange on the 1930 instrument panel and I failed to include the specific location for the 1929 wiper control.

Both the 1929 and 1930 wiper controls are mounted to the right of the steering column, but the 1929 wiper control is located on the front of the instrument panel facing outward. The 1930 wiper control is located on the lower flange of the instrument panel facing the floor.

mention should be made of the fragility of the pot metal switch csting, of which i can attest to. mike.

SORRY DOG but that's for clarification.

Hello vintageone,
Did work on my vacuum wiper during the last winter, because it was out of order and wiperman said, it cannot be restored because mine is a RHD-car built in africa :-((( . Because I watch over an more than 100 years old organ in our church with pneumatic keyboard-action it is not a complicate job for me to work on vacuum motors. I bought a lot of cheap wiper-motor-wrecks at ebay and could fix one working together.

Normally you should have a valve directly at the wiper-motor to switch it on and off. If it is on, the vacuum comes constantly and the wiper wipes as fast as strong the vacuum is. Maybe there are additional switches at dashboard to control the vacuum power to regulate the wiper faster and slower. My car does not have it.

When you switch off the wiper the vacuum is not cut off. The system at mine is following: It is just a bypass inside the wiper motor, so that the changing wiping between left and right side is blocked. If switch is off, the vacuum goes only at one side of the paddle to turn the wiper blade into park position and keep it there. Because the wiper is hanging over the window, it would fall down by earth gravity and remain in middle position during driving. But because of constant vacuum on one side of the paddle the blade is pulled to one side and remains there as long the engine is running and gives vacuum (or the wiper is switched on).

hope it helps you to understand the system.

Regards
Stefan

For 1932, the vacuum control switch is on the motor itself because the wiper motor is located on the windshield regulator header inside of the car. However, for 1929 the vacuum control switch is located on the face of the instrument panel since the wiper motor is located on the outside of the car under the metal sunvisor.