Wiper arm or Motor

[Carpenders]

Hi I have a 2017 e400 with an issue with my passenger side wiper arm juddering and stopping for to long at the end, I’ve changed the blades, Merc have said it needs a new arm and motor for £1,000, I’m thinking it could be just the arm ? Any thoughts would be very appreciated and if anyone has changed just the arm on how easy this could be.
Thank you

 

[M80]

Check the arm nut is tight.

Rdit.
On 2nd thoughts, if it were a loose arm, or slipping splines the arm would be out of sync with the drivers side.

 

[Carpenders]

Thank you, yes I’ve checked the nut, do you think it could be the motor ? The drivers side is fine and I assume there’s only one motor for both

 

[EmilysDad]

if the arm is pausing too long at either end of its stroke it would suggest to me that something in the linkage under the scuttle panel is at fault. I can't imagine how MB get to their quote of £1000!!!! Is there an unusual amount of play in the arm itself?

 

[Carpenders]

Thank you, I take it the shuttle panel is part of the arm ? The full quote was actually £828, £400 of that is the motor,

 

[EmilysDad]

Thank you, I take it the shuttle panel is part of the arm ? The full quote was actually £828, £400 of that is the motor,

The scuttle panel is the plastic panel at the base of the screen where the wiper arms poke through.

 

[Carpenders]

The scuttle panel is the plastic panel at the base of the screen where the wiper arms poke through.

Thank you but it doesn’t have that panel

 

[EmilysDad]

Thank you but it doesn’t have that panel

Sorry ... most cars do so I assumed. The wiper spindles will be driven via a linkage from the motor .... so I'm guessing the fault will be on that linkage.

 

[EmilysDad]

is this the same as fitted to your car?
https://www.ebay.co.uk/itm/364207062598 ..... £50 could be worth a go ;-)

 

[Carpenders]

Thank you, so the wiper arm as far as you would know will come with the linkage, therefore no need to buy the motor yet ?

 

[EmilysDad]

Thank you, so the wiper arm as far as you would know will come with the linkage, therefore no need to buy the motor yet ?

wiper arms themselves are attached to the spindle via a splined taper .... remove the nut from the top (normally under a clip on cover) then it should gently lever/wiggle off. It might need a puller

https://www.youtube.com/results?search_query=wiper+arm+removal+puller

Though the motor itself can removed form the linkage, they are generally supplied as a unit ....as in the link above ... that's why MB's wiper assembly is £400

 

[Carpenders]

Thank you very much