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Old 05-22-2015, 09:53 AM   #1
propav8r
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Default Improve your 240's Wipers

Maybe everyone else has already figured this out, but I still thought I'd share.

My 90 245s wipers were ridiculously slow. Borderline dangerous in anything but a light shower. When I bought the car, there were boxes of spare parts that came with it, including a better looking OE Volvo wiper motor. After being unable to see the road last night on the way home, I pulled into the shop and removed the old wiper motor.

When I put the new one in, I was disappointed to see that the wipers were only marginally better...still painfully slow.

Then I noticed that this new motor had a spot for a ground lug. I didn't realize before now that the motor grounded through the body.



I hooked up an extra ground wire and voila! Speedy, smooth wipers! I've owned 6 240s and never had windsheild wipers work this well.

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Old 05-22-2015, 10:48 AM   #2
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I've definitely replaced a lazy motor once. Wonder if this would have helped it. They've always been pretty slow on my 240s.
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Old 05-22-2015, 11:01 AM   #3
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Headed to garage to have a look-see....
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Old 05-22-2015, 11:36 AM   #4
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This looks like a good idea.

I'm curious, how was the motor grounded before you added the ground wire? All the 240 wiper motors I have seen were grounded by a brass tab under one of the mounting lugs. Those tabs can fail, and when they do, the motor generally stops dead, because it is isolated by the rubber mounting grommets.

I have never seen a ground lug like that on one of these motors, including the ones I just looked at (this is likely because my cars are extra old). It is easy enough, though, to put a ground wire on one of the screws holding the cover plate on.
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Old 05-22-2015, 11:38 AM   #5
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Originally Posted by Harry Tuttle View Post
This looks like a good idea.

I'm curious, how was the motor grounded before you added the ground wire? All the 240 wiper motors I have seen were grounded by a brass tab under one of the mounting lugs. Those tabs can fail, and when they do, the motor generally stops dead, because it is isolated by the rubber mounting grommets.

I have never seen a ground lug like that on one of these motors, including the ones I just looked at (this is likely because my cars are extra old). It is easy enough, though, to put a ground wire on one of the screws holding the cover plate on.
Yeah, my wipers actually stopped once before. The tab looked OK, but there was a lot of crap built up. I tried to clean it up, but it had little to no effect. Adding the separate ground strap made all the difference.
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Old 05-22-2015, 11:49 AM   #6
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The tab looked OK

I can dig it. I had my wipers stop once because the little peened lugs holding the ground tab to the motor body had become loose.

This make-your-own-ground could eliminate many problems.
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Old 05-22-2015, 12:38 PM   #7
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Don't the newer 240's have a ground strap on the motor? My 92 did and my 77 does not so I will be adding a ground as well.
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Old 05-22-2015, 12:43 PM   #8
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Later motors have the ground strap.

I just use early SWF motors and clean the ground tab and add a strap...

More importantly, if the seals have failed and wiper post grease has washed out and they are binding, no amount of messing with the motor will cure that...
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Old 05-22-2015, 12:43 PM   #9
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There are a couple different wiper motors. An early style that grounds through the mounting tabs (up until around 88'-89' iirc) and the later style with the separate ground lug.



http://forums.turbobricks.com/showthread.php?t=293022

I pulled one off a 93' in the yard and replaced my older style motor which was quite slow. Looking back, I wonder if it was actually the motor, or if cleaning the grounds would have yielded a similar improvement.
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Old 05-22-2015, 02:51 PM   #10
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That's awesome. Mine aren't fast either, this is a really good idea!
I think that same night when it was downpouring over here, I almost considered getting some rainX, and I really hate that stuff...
(ppl spray it on their windshields while driving, and it gets all over everyone else's)

Funny thing, I installed a front view camera in the grill a week ago, and I could actually see like 80% better through the little 5"x4" screen. (Now I think maybe I should get a bigger screen and mount it over the plastic radio hatch grill thing.)
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Old 05-22-2015, 05:44 PM   #11
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Where did you run the ground wire to?
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Old 05-22-2015, 06:57 PM   #12
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Where did you run the ground wire to?
There was a threaded hole close to the passenger side hood hinge. It's where the ignition coil was mounted on some early cars. I used that.
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Old 05-23-2015, 11:53 AM   #13
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I've disassembled, cleaned, lubed, and reassembled these wiper motors to good effect.

Not too difficult.

As for a ground, I fabricated one with thick gauge wire and round grommets on each end.

Not slow at all.
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Old 05-23-2015, 02:35 PM   #14
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My '89 had a ground strap on it when I bought the car. When I replaced the motor, it came with a new ground wire, but I reused the old strap. It's a pretty critical thing to implement if you ask me. My wipers didn't really work without it.
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Old 07-02-2015, 12:33 PM   #15
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on the early wiper motors, is only one of the 3 mounting bolts assigned to ground? if so, which one?
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Old 07-02-2015, 01:01 PM   #16
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on the early wiper motors, is only one of the 3 mounting bolts assigned to ground? if so, which one?
It is the top one.
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