 Windshield Wiper Question, Should it be splined? |
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| Highland |
 Oct 7 2025, 09:26 AM
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#1
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Senior Member  Group: Members Posts: 557 Joined: 8-August 11 From: San Diego, CA Member No.: 13,418 Region Association: Southern California  |
Should the inside of the windshield wiper mount be splined? If not, is the position maintained only by the friction pressure from the nut?
Seems like there's a chance it could flop around a bit and lose position without a spline fit.  |
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| Geezer914 |
Oct 7 2025, 11:42 AM
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#2
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Geezer914 Group: Members Posts: 2,129 Joined: 18-March 09 From: Salem, NJ Member No.: 10,179 Region Association: North East States 
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Yes.
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| Highland |
Oct 7 2025, 01:54 PM
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#3
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Senior Member Group: Members Posts: 557 Joined: 8-August 11 From: San Diego, CA Member No.: 13,418 Region Association: Southern California |
So there should be splines?
The picture is from a new URO part. Both left and right wiper fittings are smooth. |
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| bdstone914 |
Oct 7 2025, 02:21 PM
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#4
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bdstone914 Group: Members Posts: 5,186 Joined: 8-November 03 From: Riverside CA Member No.: 1,319 |
QUOTE(Highland @ Oct 7 2025, 12:54 PM)  So there should be splines? The picture is from a new URO part. Both left and right wiper fittings are smooth. No they are not splined. Only the wiper shaft is splined. The arm is softer and shapes to the shaft. I have several NOS arms with no spline. |
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| DennisV |
Nov 21 2025, 07:38 AM
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#5
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Senior Member Group: Members Posts: 779 Joined: 8-August 20 From: Santa Rosa, CA Member No.: 24,575 Region Association: Northern California
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QUOTE(bdstone914 @ Oct 7 2025, 12:21 PM) QUOTE(Highland @ Oct 7 2025, 12:54 PM) So there should be splines? The picture is from a new URO part. Both left and right wiper fittings are smooth. No they are not splined. Only the wiper shaft is splined. The arm is softer and shapes to the shaft. I have several NOS arms with no spline. If there are no spines new, is this a one time mating procedure? Is there a torque spec for the nut? Our arms flop all over the place. I tightened the nut with what seemed like pretty good force. The inside of our arms appear stripped. Is the answer more torque on the nut? I have been reluctant to get too aggressive for fear of damaging the shafts on the wiper assembly.  |
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| fixer34 |
Nov 21 2025, 02:30 PM
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#6
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Senior Member Group: Members Posts: 1,358 Joined: 16-September 14 From: Chicago area Member No.: 17,908 Region Association: Upper MidWest
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There are no splines on the wiper arm. As mentioned, it is a softer metal and the splines on the drive shaft 'dig in' a little to hold it in place.
Did you check the splines on the shaft to make sure they weren't 'filled in'? Might need a pick to clean them out. It is also possible that the wiper arms have been reamed out over the years with being too loose and will never tighten down properly. May be time for some 'new' wiper arms. |
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