Window wiper broken alloy end part REBUILD

[George Hogg]

Hi @George Hogg,
I won't have learned anything if I do that.

Ok, I understand that but watch out you don’t scratch the screen with the wiper. It does not take much slack in the bearings

 

[rotifer II]

Pin dimensions​

5mm diameter
33-35mm length
25-27mm length

Searched for the following types of pin

• 304 Stainless steel flat head grooved pin with retaining ring
• 304 Stainless steel double head grooved pin
• 304 stainless steel clevis pin/hinge pin/rigging pin

Ordered clevis pins from UK supplier and flat heads from China.

 

[rotifer II]

Stainless Pins​

Since the circlip (e-clip) fastener closely resembles the low profile factory finish, I have decided to use it out of the two sets that arrived.

 

[rotifer II]

Minor Modification​

Both sets are too long, so I must have measured the pin's required length wrong. Although I do not have a lathe, I do have a rotary tool with a cutting disc, cable ties, a parkside drill, and a vice.

Using a permanent pen, mark the necessary length on the pin, insert the pin into the drill's jaws, and adjust the drill's trigger speed with a cable tie.
The rotary tool was used to cut a new groove in the pin and reduce its overall length.

​

 

[rotifer II]

Fitting​

The alloy end section located in the worn-out wiper arm was removed. To make room for the new pin, the smaller of the two holes in the new wiper arm was drilled to a diameter of 5 mm.

At this point, the pin is able to pass through both of the holes.

Because the new pin's diameter is slightly less than the original pin's, there is some slack in the bushings found in the alloy end part. After some thought, I came to the conclusion that, when the wiper is in use, the spring force is acting on the pin through the alloy end part, preventing it from rotating. Debris trapped between the pin and the pressed bushings of the alloy end part will only cause friction and surface wear when the wiper arm is raised and lowered. Since the pin only rotates when the wiper arm is raised for cleaning or blade replacement, it should last a long time.
The old pin was an interference fit and rivet and did not rotate where it passed through the arm.
Because the new pin is not one of the aforementioned, when the arm is raised and lowered, it may spin the pin and enlarge the holes in the wiper arm.

It is possible to apply two paint pen dots: one on the arm and one on the pinhead. The dots can be examined to determine whether the pin has moved after using the wiper and when the arm is raised and lowered.

EDIT
The pin does not move when the arm is raised and lowered.

 

[rotifer II]

Refitting the Spring​

Final Outcome (MK I prototype)​

The linear slack was successfully taken up by a washer that I was able to install beneath the e-clip.

 

[rotifer II]

Ok, I understand that but watch out you don’t scratch the screen with the wiper. It does not take much slack in the bearings

Many thanks, @George Hogg After inspection, the end bushings are in fair condition. When in use, the wiper does not make contact with the screen.

 

[rotifer II]

Wiper Arm Rivet Umbrella​

It is wise to protect the rivets from the UK weather, so some old plastic will be cut to size and number plate tape used to stick it to the wiper arm.

Parts needs 24 hours to dry but got 9 hours in the airing cupboard.

For comparison the old style wiper arm end and the new style beneath it.

 

[rotifer II]

Stripped Splines Repair Videos​

If you ride a bike with high-end carbon components, you are probably familiar with friction pastes, which could be used before resorting to trying the following repair videos.
Do clean both spindles with a craft knife blade before fitting the arm.

 

[rotifer II]

Found the photos of my last repair on the opposite end.
Feb 2018