VCCA Home Forums TECHNICAL - 1945 AND EARLIER 1937-1945 41 SD vent window regulator

My driver side vent window regulator doesn't work. The handle just spins. I've removed the handle and made sure it's not just the handle. I don't find much on those when I google. I think I found one on ebay, but it doesn't look the same as the one that is still installed in my door. Am I just not getting the right perspective?
https://www.ebay.com/itm/41-42-46-47-48-CHEVY-PONTIAC-OLDS-LEFT-FRONT-DOOR-VENT-WING-WINDOW-REGULATOR/132601842445?epid=1023885772&hash=item1edfaf8b0d:g:8B8AAOSwS-Va5K1l


Next.....we'll talk about door clips :(

What is the casting number on yours? I have some new ones but do ot know what they fit.

I didn’t have the courage to pull it last night to get a closer look. Will try today

I got it out this morning. It's T77123

Hi Scott,

Just tried to post an answer for you but erased my post. Will repost later. The stamping # Gene is referring to is T77122 right and T77123 left. The numbers are stamped on the back of the regulator. The part on ebay LOOKS like it might fit so I recommend buying it and returning it if it doesn't. The part is hard to find, and cannot be easily rebuilt. Call me 1-989-832-7634. if you are in a hurry.

Good luck, Mike

A follow-on. Attached is a a screenshot of my current regulator. The arrow points to the spot where the vent window "hinge" connects. It seems like the pot metal broke and allowed the vent window to move freely. I expect that the replacement regulator will have a "cup" that holds the hinge and there is a set screw to prevent the the window from turning without the regulator turning as well. I'm missing that set screw...assume I just go find something as short as possible that is the right size?

You must be in pretty good shape. I only see three pills in your pill box. Mine is filled to the top.

Hi Scott,

You should be able to reuse your regulator once you find the right size bolt (about 3/4" long standard thread). I recommend you soak the regulator in a small can of transmission fluid over night. After soaking it unscrew the screw applying tension to the swivel head. The transmission fluid will have loosened up the grease inside the regulator and lubricated all the moving parts. Let the regulator sit on a hand tissue for a day so the excess fluid can leak out.

Your picture shows that the shaft the vent handle is attached to is in good condition. A lot of regulator failures are caused by the shaft (made of steel) rusting so badly that the vent handle turns without moving the shaft as the vent is forced open or closed. Dried up grease lubricant can also make the vent hard to open and close causing damage.

When replacing the parts that put tension on the swivel its best to not tighten the screw very much to insure smooth easy movement of the window vent, and prevent ventilator damage.

Here are some web sites to help with your project: 1941 window vent removal

Chevy Parts Manual picture of vent window parts

Good luck, MIke

Blood pressure, cholesterol, and allergies

So...I don't need the other side of the "cup" that goes up to the window?
The crank actually turns pretty easily and once I got the shaft back in alignment (out of over-travel) with the gears the mechanism works well.
I don't get why it was disconnected. No bolt was there. I just went and checked and the shaft coming down from the window was intact.

Got my regulator soaked and turning easily. Put it back in tonight and it works great. Was not easy to get the shaft from the vent connected to the regulator, seemed a hair too short...but i got it in.
Tomorrow i will put the door panel back on and hopefully get my shift knob back on

Thanks again

Followup question. My eBay purchase arrived and was missing the retaining clip that keeps the crank in (the shaft that the driver turns). In Mike's pictures above, I see his was removed too (by drilling). How does that shaft stay in?

Hi Scott,

Please post a picture of what you are talking about. I am confused by your description, and am suspicious about the quality of your part?

Thanks, Mike

Since my original one worked for me...I was just going to put this in a box and keep it just in case. But not if it's broken.

Hi Scott,

It is broken. It is missing the cover which you can see in my 1st and 2nd pictures. Normally, I like to save things for the parts that could be reused, but this one is just too far gone. I have a box of extra regulator parts for rebuilding them, and the parts I don't want I give to a scrap man.

Thanks for the picture, Mike

Thanks. That's what I thought. I could salvage some of the parts...but I can't use the whole thing. Will see if I can return it.

Wow...the ebay seller refunded my purchase...no questions asked. Was very nice about it. Classy