Help Single Windscreen wiper

[sutty]

I have just replaced the windscreen motor on my c230 Komp (W202) and the motion works fine but it comes to rest 1/4 of the way up the screen does anyone know how to adjust it so it rests at the bottom?

I can't move the motor or any of the mechanism as the wipe motion is perfect.

Cheers

 

[television]

Hello and welcome.

When the wiper is running, is it going to the bottom of the screen, or too far over to the other side

 

[sutty]

When its running it goes to the bottom of the screen (both sides) and then comes back up and rests right in the drivers eyeline

 

[television]

When its running it goes to the bottom of the screen (both sides) and then comes back up and rests right in the drivers eyeline

Sad to say then that I think that the parking gear has jumped a few teeth and that another motor assembly will be needed

 

[sutty]

The motor is brand new the linkage is mint and not very old, i dont know what you meen about the parking gear as the wiper and the gearbox dont have any thing to do with each other?? its from a c230 komp 1998 estate and has just a basic wiper set up

 

[sutty]

sorry me being an idiot ive never heard it called parking gear before

 

[television]

Inside the wiper motor there is a set of contacts that keep the motor running until the gearwheel in the motor opens the contacts and the motor stops. As the sweep is correct, one could say that the wiper arm is in the correct place on the spline on the motor, so if the blade was moved so that the arm parked, the sweep would be wrong.

One could take the motor apart and try and reset the gears, but if one has jumped, it can do it again.

I hope that I am correct in the above, not for you though.

If its new then why not take it back to where it came from

 

[sutty]

Hi mate somehow i fixed it i dont realy know how i did it and how long it will last but at least i should be able to get an M.O.T for it cheers for the help gave me a few ideas to try.

Cheers mate

David

 

[Dec]

David, there is nothing wrong with your motor or mechanism, its just the way that you have initially set up the park position, you now appear to have set it up correctly. Refer to the picture bellow if you have any doubts or further problems.

See also… http://forums.mercedesclub.org.uk/showthread.php?t=35032 …be sure to read all 3 pages, all of it doesn’t apply to you but useful to know.

Dec

 

[television]

Was I that wrong thanks Dec,,I cant work it out yet.

I have sent an E mail to Sutty asking him to come back to the thread

 

[MB TECH WARRINGTON]

if the park position is set correctly, ive had the multifunction relay faulty causing parking faults only in intermittant wipe, this is the only wipe function the relay controls,

 

[Dec]

I cant work it out yet.

I don’t blame you, it’s the most confusing contraption there is on a W202, very hard to get your head around even when it is physically in front of you.

The fact that he just put in a new motor and the only fault was where the blade finally comes to park on the screen, suggest that he didn’t align the markings correctly, that’s exactly what I did when I first took the thing apart.
He probably took the mechanism out again and moves the blade down a few inches to where it is supposed to be, so I would say it is all about right now.

The only thing that will go wrong with the motor, 99% of the time, is that the nylon gear will be partially stripped by the worm, the points/switches inside the motor never seem to be at fault and the motor will always park because when it is switched off at the stalk it will always finish its sweep because it is only when Switch 1 runs out of “rail” and meets the “gap” that it will come to a stop, so in his case the blade wasn’t synchronized with the motor.

Very hard to explain it, that’s why it needs so many pictures.

Dec

 

[television]

Thank you Dec ,,at least I was on the right track, I would have hated to have re assembled it without knowing where the markings should be

 

[sutty]

I think that somewhere along the line it must have moved somehow as i kept the whole lot in exactly the same position while replacing the motor, i striped it all down rebuilt it and re-greased all of the components because the markings on the casing for the park position wouldn't even come close to matching up. Its now setup like the pic you sent and seems to work fine.

The mechanism was replaced at a Mercedes dealership before i bought the car and i think they did a bit of a cowboy job on it as the wiper was never right.

Cheers lads

 

[Dec]

Thanks for the feedback, be sure to lubricate the wiper mechanism at least twice a year, its a 3 minute job when you get the hang of it. It was probably the absence of grease under the “turtel shell” cover that caused the motor failure in the first place.

Dec

 

[ionod55555]

Hi,
I had the same problem on my W202 a while ago. Mine was caused by operating the wiper briefly while frost on windscreen causing the motor to jump a coupe of teeth. Took motor out and found nut 1 not to be too tight. I set to marks as detailed earlier in this post, made sure all nuts were tight and all was well.

 

[television]

Hi,
I had the same problem on my W202 a while ago. Mine was caused by operating the wiper briefly while frost on windscreen causing the motor to jump a coupe of teeth. Took motor out and found nut 1 not to be too tight. I set to marks as detailed earlier in this post, made sure all nuts were tight and all was well.

Just shows what can be done, and good on you for having a go, the same to Sutty