Rear wiper on a Z Coupe

The rear wiper worked perfectly for 7 years and just suddenly stopped working. The washer still responds to input from the stick on the steering wheel column. Anyone experienced this?

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On 1/5/2008 5:13 PM, snipped-for-privacy@gmail.com went clickity clack on the keyboard and produced this interesting bit of text:

Is the motor making sounds like it's trying to move the wiper? If so, it could be that it just came loose. I had this happen with my '79 528i. Of course I didn't find out it happened until I was going through a heavy rain storm.
--
Money can't buy love, but it improves your bargaining position. -
Christopher Marlowe (1564-1593)
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I just repaired my wiper motor (18 Dec.). Z3 3.0i mod 2002. The nozzle was obstructed and the liquid was pouring inside the wiper motor then between the trim panel and the door.
Description: The washing liquid goes through the shaft the wiper arm is screwed onto. On the opposite end, there's a small plastic box covering the end of the shaft, connected to the liquid inlet. A lip seal (SPI seal) is mounted inside this small box, avoiding leaks into the gears. The lip and the spring are turned towards the liquid side.
Failure: In my case, the spring supposed to ensure a good pressure of the lip against the shaft was conpletely rusted and the liquid leaking inside.
Procedure:
First, I removed the trim panel. There are two Parker screws inside the inner handle which heads are hidden under two small plastic caps. Then, I took a steel blade, covered it with fabric, not to damage the plastic nor the paint. I slided it between the paned and the door, using it as a lever. I pulled the panel firmly but with an extreme care. I "gently violated it". There are no wires interfering with it. I put it in the trunk.
Second, I dismounted the wiper motor and cleaned it (taking care not to put petrol inside the motor itself nor inside the transducer). I also replaced the seal it's an 16 x 10 x 4 with a spring. I replaced the grease.
To fit a new seal, the operaton is tricky because the box connected to the shaft on one side and the cleaning liquid tube on the opposite end has four hot crushed lugs. I had to cut them, keeping half of a millimeter length to get a good centering further on. I also made a hub cap with a big washer (20 mm int dia.) to remount the seal plastic box with four 3 mm screws. The procedure needs to drill four new holes in the wiper gear box flange because the current holes interfere with the walls of the plastic box. Hard to describe :-(
I took some pictures and drew a sketch of the parts to build and modify. Seeing them the procedure appears to be very simple ! Should you be interested, feel free to ask me, it would be a pleasure for me to help you, putting the Technical Package on Megaupload or similar. My intention was write a FAQ for the Z3 French club site. I didn't have time up to now.
At the end of the first step, pay attention onto the door switch and the way it's mounted under the lock: two "key holes" that's all ! This is one of the issues with the rear door when the lugs disengage from the key holes. Worth to observe prior to the failure occurs!
Don't keep trying to use the rear wiper because the rust may be installed inside the gears making uncoverable damages. Moreover, the liquid goes stright on through the hatchback lock !
Good luck
went clickity clack on

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replying to phil.brotherton, wektor wrote: Over time, the wiper on BMW X5, X6 cars goes down, the brush «sticky» at work, or stop moving completely. The reason is that the wiper motor BMW 61617200510 wear plastic pinion teeth licks. Riding with a defective wiper is very dangerous, especially in winter.
The manufacturer sells only trapeze wiper assembly with an electric motor worth more than $400.
We produce and sell the gear motor wiper BMW 61617200510 separately. vanos-bmw.com/gear-motor-wiper-bmw-x5-e70-x6-e71-oem-61617200510
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