How to Switch from an E9 to an E12 or E24 Wiper Motor

Before removing the E9 wiper motor. Tape the windshield wipers & arms to the windshield, this will ensure the linkage is in the correct place when reinstalling the E24 wiper motor.

Remove the wiper motor by removing the linkage nut first, may need to pry the arm off of the splined shaft with a flat screwdriver. Then remove the 3 10mm bolts. With a little wiggling the motor should be fairly easy to remove & unplug.

The E9 wiper motor has a separate ground wire spade on the body of the motor.

The E24 will fit perfectly. Just need to modify the ground wire with a crimp loop to bolt to the motor as shown.

Reassembly is straight forward after the small modification. I did this at The Vintage in Asheville with Rob Siegel & Billy Revis in under 30 minutes.

 

[eriknetherlands]

Good to know the option exists. What is the benefit of this motor over the e9 model?
Can you also use the linkage of the e24?
That would be interesting, as the big threaded parts with spindles inside, especially the left one with the 2 ball joints, are usually quite rusted. Only saw one NOS part in 10 years, about a year ago for 220 euro's already.

 

[adawil2002]

The advantage over the E9 is mine failed & shorted out due to water infiltration. I poured out 4 to 5 ounces of rusty water. The E24 was available. It’s 15 years newer is noticeably smoother & faster than the E9 motor. The E9 wiper motor covers have long been NLA, so I modified a 2002 cover to help protect the motor.

Wiper linkage from the E24 is different to my knowledge.

 

[DWMBMW]

Faster! That means the wiper arms will fly off further. Maybe onto a grassy area for a soft landing vs being run over by the truck behind.

 

[Stevehose]

Faster! That means the wiper arms will fly off further. Maybe onto a grassy area for a soft landing vs being run over by the truck behind.

Not with my super duper bolt-on mod! I'm going to do this, my wioper motor is lame, thanks @adawil2002

 

[jmackro]

Not with my super duper bolt-on mod! I'm going to do this, my wioper motor is lame, thanks @adawil2002

Please tell us about your super duper bolt-on mod. If you've already described it here, could you provide a link?

 

[Stevehose]

Please tell us about your super duper bolt-on mod. If you've already described it here, could you provide a link?

Windshield wiper thread-tap grub screw modification so they don't fly off project

Since I have a pending road trip and would like one less worry (the dreaded windshield wiper highway detachment syndrome) I thought I'd give a go at inserting a grub screw through the wiper arm base into the splined post to lock them on. A dicey proposition on paper and in reality. Here's the...

e9coupe.com

 

[jmackro]

OK, thanks!

 

[Stevehose]

Does this have to be an e24 motor or do other models fit (e28 etc) ?

 

[adawil2002]

Does this have to be an e24 motor or do other models fit (e28 etc) ?

I have only done the E24.

 

[HB Chris]

E12 is same motor

 

[teahead]

Ya, I put an E12 motor on my CSi I had.

The wiring location was the only thing I had to modify. Was hardly a big deal at all to do. Pretty obvious what you'd have to do when you have it in front of you.

 

[adawil2002]

E12 is same motor

Ya, I put an E12 motor on my CSi I had.

The wiring location was the only thing I had to modify. Was hardly a big deal at all to do. Pretty obvious what you'd have to do when you have it in front of you.

Edited the title to include E12.

 

[Midwestbike]

So I am replacing my wiper motor with one from an 84 e24 and kept the harness from the new one and the harness from the original one and matched the colors and added a ground to it and it blows a fuse as soon as you turn it on.

the Wiper works great hooked to 12v. Not sure what I am doing wrong, but I am not an electrician and I know I am doing something wrong.

When I first wired I didn’t know what to do the the ground on the old motor and nothing happened. But now anytime I try to hook up the previous ground to the motor, it blows a fuse.

 

[Midwestbike]

 

[teahead]

Old motor, fuse didn't blow?

 

[adawil2002]

@Midwestbike. With the E24 wiper motor, I used the original CSi harness plug with the ground wire attached with a crimped loop to the wiper motor's ground bolt.

I'm surprised this would blow a fuse in your CSL which is a CSI-L.

 

[rsporsche]

i had forgotten about this fantastic modification @Stevehose ... thanks for reminding us. also i love the info on the e24 motor - thanks @adawil2002

 

[Midwestbike]

No old motor didn’t blow a fuse, it just wouldn’t run unless helped and when I took it apart it was very disintegrated inside it.

 

[Midwestbike]

@Midwestbike. With the E24 wiper motor, I used the original CSi harness plug with the ground wire attached with a crimped loop to the wiper motor's ground bolt.

I'm surprised this would blow a fuse in your CSL which is a CSI-L.

So if I understand correctly, I need to attach the brown ground wire that was on the old wiper motor separate from the connector and crimp it on to the old harness connector to the brown wire. And yes it is a CSiL DJetronic.