Folding Mirror Motor - Mercedes Benz SLK Forum

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#1 Old 08-01-2012
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Folding Mirror Motor

I posted a couple of years ago about a failed folding mirror motor. I took the whole thing apart, cleaned it & it worked for a while & stopped again! I have just taken it all apart again & I find that the commutator of the motor has a detached segment. The motor is a very cheap looking part with only 3 commutator segments. Does anyone know a source of replacement motors, not the whole assembly, just the motor?
Tomorrow I plan to try & repair the existing motor but it may be unrepairable!
Having seen the insides of these motors I'm not surprised they fail. I seem to remember reading that someone does a repair kit, where can I get one please?
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#2 Old 08-02-2012
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Folding Mirror Motor

Hello Again,
I tried to repair my existing motor but it is beyond it!
I have found a source of new motors which should fit.
The motor which is the same size as the Mercedes original one is a Mabushi FC-280 but it needs to be the type with the brush plate at the opposite end to the shaft. Also the shaft needs to be 20mm long.
Ebay part number 120935451126 is available with a 20mm shaft from a supplier in Pennsylvania, zinky86. Cost is about $6 each.
I have one on order, I will report progress when it arrives!
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#3 Old 08-02-2012
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Please do keep us up to date!! I'm sure others will experience the same problems as the cars get older.



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#4 Old 08-16-2012
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R171 folding mirror repair

So the motor arrived from USA. It is the one I mentioned in my earlier post.
The replacement is straightforward but there are a few difficult stages (9 & 12 below)!
1) Remove complete folding mirror. Involves removing black panel at inside front of door. Disconnect black & white connectors to mirror. Remove tweeter speaker panel inside car at mirror position. Remove 3 TORX screws holding mirror.
2) Take mirror somewhere with good lighting & a bench. Remove mirror glass, this is covered elsewhere in the forum. Don't break glass! Disconnect heater element wires from glass.
3) Remove 3 TORX screws holding the circular mirror adjustment motor unit & unplug from loom.
4) Remove 3 TORX screws holding mirror outer shell. Pull & twist outer shell off.
5) Disconnect all the other wires/connectors inside mirror.
6) CAREFULLY remove big circlip from the top of the mirror swivel pivot. There is a circlip holding down a dished washer, a nylon washer & a big spring. The big spring is under tension so be carefull not to lose any of the pieces as it comes apart!
6) Remove 3 TORX screws holding the alloy folding motor gear housing into the big black plastic mirror mount.
7)Separate the alloy motor gear housing from the black mirror mount & put all the other parts carefully away ready for reassembly.
8) Use a marker pen to mark the alloy housing with the position of the motor connector. Now carefully prise off the black plastic cover from the top of the motor, it sits in a groove on the alloy case. Move the cover up & sideways to clear the two electrical contacts of the motor. Now pull out the motor from the alloy gear housing. (A clear plastic sleeve around the motor may come out with the motor, if it does remove it from the motor ready to fit to the new one). Remove the two metal contacts from the side of the old motor, they are just pushed in sideways.
9) You now need to remove the worm gear from the old motor & refit to the new one. I think it was fitted with loctite or similar so I heated the shaft before carefully pressing the worm off-do not damage it!
10) Refit the worm to the new motor pushing on to the same position as original. Refit the two metal contacts to the motor & carefully refit the black plastic motor end cap so that the contacts fit into the connector housing. Fit motor & sleeve into housing remembering to line up the connector with your marker pen marks!
11) Refit the alloy motor gear housing into the black plastic mirror mount with 3 TORX.
12) Most difficult part follows....Now put the mirror mount back over the pivot pin. Put the big spring, nylon washer, & dished metal washer over the pivot pin & somehow compress the lot so that you can slide in the circlip.
I did this using a fly press & a "U" shaped block. You will need to devise your own method. Perhaps if you have a couple of strong assistants you could get them to compress the spring with screwdrivers while you put the circlip in? BE CAREFULL!
13) Reassemble/reconnect all the other parts. Refit the mirror to your car
& have a beer!
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#5 Old 08-16-2012
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