Driver's side wiper arm keeps coming loose - Alfa Romeo Bulletin Board & Forums

 
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post #1 of 12 (permalink) Old 03-15-2017, 10:06 AM Thread Starter
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Driver's side wiper arm keeps coming loose

any of you experienced the driver's side wiper coming loose from the post? Mine does! I tighten the nut and it works a while, then it'll be loose again. Doesn't help that unless you have it adjusted just right the top of the arm comes to far over and hits the edge of the windshield. This quickly contributes to the loosening up.

Because I'm not as clever as most of you all, ... any great solution for keeping that arm locked in place?
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post #2 of 12 (permalink) Old 03-15-2017, 10:19 AM
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The last one I did, I put some Locktite on the shaft before attaching the arm and tightening the nut.
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post #3 of 12 (permalink) Old 03-15-2017, 10:37 AM
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Ensure you have a lock washer under the nut, too. Original lockwasher is a thin wave washer.

Conical euro or even a SAE split lock washer will work , too. Blue lock tight on threads plus lock washer may end your tale of woe.

I removed multi wiper arm contraption the 94-95 models came on driver's side with and installed a wiper arm off 91-93 model to finally fix one that was on Myron's 95LS.

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Daily drivers: USA models - 1991 164S Black Beauty II ALFISTO;

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post #4 of 12 (permalink) Old 03-15-2017, 10:43 AM
Del
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One thing I've done in the past was to tighten everything up, after adjusting the location of the arm carefully as it should be, was to then drill a small hole down between the side of the shaft and the arm mounting lug. Then I ran in a very small self tapping screw down that hole so that it acted just like a woodruff key to pin the arm onto the shaft. Or, I might have tapped that hole since I have had small taps, etc, but I don't remember now.

Worked fine for years after that, and you could still pull things apart if needed. Nothing irreversibly damaged.

Or, you could drill a horizontal hole through the arm mounting lug and the shaft, and install a bolt going through, as if it were a "cotter" pin. Once again, nothing irreversibly damaged.

You do have to make sure that everything is adjusted exactly correct.

BTW, did you have a chance to to talk to RR about the 164S pieces they might still have?

Del

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89 Milano (wife's daily driver since 1989, Shankle Sport)
91 164S (my daily driver since 1994)
94 164LS (~Q) (trip Alfa since 2000)
72 Morgan 27 (water time since 1976)

previously owned since 1964:

62 Morris MiniMinor 850, 67 Austin 1275 Cooper S (Downton 3/4 race), 64 Giulia Sprint GT (1st red one made), 72 Fiat 128 Sedan, 75 Alfetta Sedan, 78 Alfetta Sedan, 78 GTV, 81 GTV6, 86 GTV6
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post #5 of 12 (permalink) Old 03-15-2017, 03:25 PM
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"Doesn't help that unless you have it adjusted just right the top of the arm comes to far over and hits the edge of the windshield. "

Regarding the sweep and the hitting of the edge of the windshield. I don't know if the 24v wiper assembly is the same as the 12v wiper assembly, but on the 12v there is a ball joint (clutch) with eccentric that makes the arm "park" when you shut off the switch (reversing the motor); on start it moves out of "park", then the sweep shifts. When this ball joint dries up with age, the plastic expands, and the "park" function stops working. It can be fixed by dismantling the joint, sanding down the ball and adding a specific plastic lubricate (for example Molykote 33, good for low temperatures). With Alex Schaffer's kind help I wrote up this tutorial 2011. Mine has worked flawlessly since then.

windshield wiper "parking"

Again, one caveat, I don't know if 24v and 12v use the same ball joint design with "parking" position.

white '92 164 S (67K)
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post #6 of 12 (permalink) Old 03-15-2017, 03:56 PM
Del
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I think his problem is that the arm comes loose from the post and slips; however, having said that, he should elaborate on the specifics.

The wiper parking problem can raise it's ugly head with age. Interesting repair. Will save it.

Del

Seattle

89 Milano (wife's daily driver since 1989, Shankle Sport)
91 164S (my daily driver since 1994)
94 164LS (~Q) (trip Alfa since 2000)
72 Morgan 27 (water time since 1976)

previously owned since 1964:

62 Morris MiniMinor 850, 67 Austin 1275 Cooper S (Downton 3/4 race), 64 Giulia Sprint GT (1st red one made), 72 Fiat 128 Sedan, 75 Alfetta Sedan, 78 Alfetta Sedan, 78 GTV, 81 GTV6, 86 GTV6

Last edited by Del; 03-15-2017 at 04:00 PM.
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post #7 of 12 (permalink) Old 03-15-2017, 07:20 PM
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My vote is for locktite. Magic stuff. Blue is the correct colour.

1991 Alfa Romeo 164L 5 spd
White on grey leather 230K km, owned from new
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post #8 of 12 (permalink) Old 03-16-2017, 09:39 AM
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The drivers side arms were loosening on both of my 164's. I felt it was being caused by the arm hitting the hood. I put shims at the hood hinges to raise the hood on one of them. On the other, hood shims werent enough, I put shims on the wiper assembly mounting locations to lower the arms.
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post #9 of 12 (permalink) Old 03-16-2017, 08:15 PM
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I've got the same problem with my passenger side wiper. Sometimes, the 13mm nut rattles loose even immediately after tightening it. This causes the wiper arm malfunction because of lack of tension with the rotating shaft. I believe the culprit is just a worn down wiper arm caused by everyday friction. A washer, as was mentioned by Alfisto Steve, coupled with some medium strength threadlocker should do the trick.
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post #10 of 12 (permalink) Old 03-17-2017, 05:43 AM
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Arm coming loose

Main cause is the knurls (ridges?) on the inside of the arm and on the post wear out and no longer mesh. made worse if the arm is even a little loose. Mine loosened up during a rain sprinkle. I took it off, wrapped a thin layer of foil tape around the stem and tightened up again. Worked for months but that tape crumbles after awhile. I am going to drill through and install a thin split pin or possibly a plastic one instead. Only concern with a permanent connection is that that a heavy load may cause the motor to stress out. Better to lose an arm than a motor.
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post #11 of 12 (permalink) Old 03-17-2017, 02:03 PM Thread Starter
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Amazing responses guys. Thanks much. I'll investigate options this weekend.
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post #12 of 12 (permalink) Old 03-17-2017, 10:16 PM
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Wipers, wipers, wipers! El Hefe is after me to tweak our wipers. One of the arms broke, so we put fresh arms on the old motor, but we don't have the wipers exactly right on the posts! The driver's side wiper only comes to about 4" from the left edge of the windshield, so I am going to TRY to move the wipers 1 ridge, to correct it. Don't expect to get it right on the first try, but who knows? It's going to rain until sunday, so I guess we'll figure it out then.
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