View Full Version : TR2/3/3A TR2 Wiper motors

06-16-2014, 07:17 PM
I'm rebuilding the wiper motor. Since it never worked, I don't know how it is supposed to work. I see no mechanism to provide a "park" position. Can someone tell me if this is correct? It appears you have to manually bump it to the parked position.

06-17-2014, 07:10 AM
No park on the early ones. Here are a couple pictures of mine. Cheers, Mike


06-17-2014, 08:25 AM
Thanks Mike. I was worried that I was missing something. Your rebuild looks very nice!

Your pictures reminded me about something else on the motor assembly that drew my attention. Did you figure out what the little ball bearing was for? It's the one you can see in the second and third pictures. Behind the ball there is a drilled passage to the brass bushing inside. I would think it's for lubrication, but the ball is staked and doesn't move. Maybe that's how the factory filled the gearbox with grease after assembly?

Marvin Gruber
06-17-2014, 09:38 AM
I'm sure the ball is for lubrication. Not sure of how it is done. Just oil on the ball and let it weep in? Guess who has a new wiper motor and gearbox still in the original box.


06-17-2014, 04:14 PM
Marv, you've got everything...just wish we lived closer to each other! I think I have this motor ready to reassemble. If I run into issues, I'll be in touch...during my continuing quest to build a 60 year old car by mail order!

I let my 14 year old son take the wiper motor apart. I went through the drudgery of cleaning and painting. The only hard part was that the commutator fell apart when I tried to clean it. I looked all over the country before I found a new commutator that is not perfect, but very close. Now I'll let my son put it all back together...to keep him busy this summer. Anyway, there is a chance my "close" commutator will not work properly, so I very well may be in touch!

That ball eludes me. It looks like it would push in to apply oil, but mine won't budge. It feels like it was drifted into place. I might put more effort into it to see if it'll move.

Also, your head is coming along. I replaced the guides myself. The valve seats look almost new, with the exception of that #4 exhaust. I decided to have them install hardened seats for all 4 exhausts, and only touch the intake seats to true them up. Then just a quick shave and it'll be ready for another 200k miles. That's a lot of parts trips to 'Bama!

06-17-2014, 09:10 PM
John I remember looking at that ball bearing and being puzzled. Somehow I just forgot about it. Lubrication sounds reasonable. I just greased mine. Don't anticipate using as I applied Rain-X. Plus I had some issues trying to get wiper travel adjusted. Never really sorted that out properly so suggestions about that would be welcome. However, wipers are pretty much for show. Cheers, Mike

06-20-2014, 06:24 PM
I've not worked on one, but that ball looks to me like it was used to plug a passage for some reason. Not likely you would expect to oil past the ball, in this case.

Wiper travel is set primarily by the gear that is installed in the wiper motor. A quick peek at the Lucas catalog shows them all the way from 95 degree sweep to 160 degree sweep. Since the motors are identical otherwise (the gears interchange), my guess is that you have somehow gotten the wrong gear. No easy way to change it, so my suggestion would be to look for another gear.

Looking at the photos, you might be able to break the spot welds and reweld the bracket so the pivot is closer to the center (for less sweep). But it would be tricky and I think you're more likely to wind up with a pile of scrap and no workable motor at all.

06-21-2014, 07:43 AM
Thanks Randall. Yes, I wondered about the gears. It was an original looking wiper motor that came in the boxes with the car. As it was the only motor, seemed reasonable it was original. Will do some more research on gears. Wonder if part numbers are stamped on them? Cheers, Mike

06-21-2014, 08:44 AM
Mike, your gears look exactly like mine. I think we have the right ones, as mine were untouched for 30+ years.

06-21-2014, 09:44 AM
Thanks John. Cheers, Mike

06-21-2014, 10:12 AM
Looking at Mike's photos above, I do see a part number stamped on the gear. Unfortunately I can't quite make out what it is.

But the Lucas master catalog says that early TR2-3 should have a 75150A motor, with a 738908 gear; giving 130 degrees of sweep. Looking at other listings, it appears that 738909 gives 140 degrees, and 738910 gives 150 degrees. But I also found 738910 listed for some 160 degree motors, so perhaps there is something else going on as well. I'll try to look at it a bit more tonight.

But the geometry of that gear, and the gears in the wheel boxes, and the length of the connecting rod; should be the only things that affect the angle of sweep.

06-24-2014, 02:56 PM
My son got the motor all back together. Here are a couple shots of the hard part. The communtator plates fell off, so I had to source commutators from around the country. They are NLA, but I found one that is close. It had to be drilled to the proper shaft size. One more part bagged and stored...

https://i1082.photobucket.com/albums/j377/cjdurant/DSC01824.jpg (https://s1082.photobucket.com/user/cjdurant/media/DSC01824.jpg.html)

https://i1082.photobucket.com/albums/j377/cjdurant/DSC01830.jpg (https://s1082.photobucket.com/user/cjdurant/media/DSC01830.jpg.html)

https://i1082.photobucket.com/albums/j377/cjdurant/DSC01831.jpg (https://s1082.photobucket.com/user/cjdurant/media/DSC01831.jpg.html)

https://i1082.photobucket.com/albums/j377/cjdurant/DSC01832.jpg (https://s1082.photobucket.com/user/cjdurant/media/DSC01832.jpg.html)

https://i1082.photobucket.com/albums/j377/cjdurant/DSC01833.jpg (https://s1082.photobucket.com/user/cjdurant/media/DSC01833.jpg.html)

06-25-2014, 06:51 AM
Nice bit of repair/restoration! Cheers, Mike