[RDKeysor]

From time to time over the years (I've owned my 968 for 22 years) I heard a brief howl that I think emanated from the wiper motor. Yeah, it happened when the wipers were switched on.  Now the noise has returned and is continuous.  I removed the plastic cover over the wiper mechanism and lubricated the wiper system connections at both wiper arms and the motor.  This was the easy fix and not a solution.  I'm wondering if the plate that covers the top of the motor and readily visible (it also has the wires that operate the motor) can be removed and a lubricant put into the mechanism.  I assume it might be best to remove the battery ground wire and remove the plug that provides power to the motor.  If that isn't an avenue to stop the squawk, I suppose the motor has so come out.  I gather from earlier posts that removing the air handler will allow access to whatever retains the motor in place. Finally, a few years ago I posted the tale of how I started losing functions on my wipers, beginning with the intermittent operation, then the low speed. I'll spare you the details, but in the course of searching for the problem, I unplugged and then replugged the wiper motor.  Eureka.  I had done nothing but unplug it and plug it back in.   I'll spare you the earlier details of removing the steering wheel, pulling apart the dash, trying a new switch, etc., none of which had brought results.  Appreciate any suggestions on the howl.  

 

Also, earlier I sought help in getting the intermittent wiper adjustment switch reinstalled after it disappeared inside the dash.  Have no idea how that happened.  I did a lot of disassembly, including the strip behind the radio, etc., and have with much difficulty returned the switch to where it functions.  I am not sure that I fully re-engaged the switch's notch that is supposed to interlock into the inside of the dash. This instrument, you may recall, is just to the right of the steering column.  Bottom line is that I have the switch back in operation 

Partial Post: Please Login or Register to read the full post.

[vliegwielolaf1234]

Had the same problem, years ago , ended up pulling the complete wiper assembly , and replaced the wiper motor , corrosion in the motor .

 

I remember because it is a pain to remove , if i recall right , you need to remove the complete (heater) blower motor assembly  , to remove the wiper assembly .

 

Not a 100% sure , if you can remove the motor without taking out the wiper assembly ,  if i remember correct , it is not possible .

 

Replaced mine with a used 944 one , still works fine .

 

There are parts wich have grease on them , it turns hard over the years , so maybe you can revive yours , still needs to come out .

 

Make sure you mark the possition of the motor , and driveshaft/arm of the wiper , and do not connect the wipers before you test the first time , if you made a mistake , you could end up with dammage .

Partial Post: Please Login or Register to read the full post.

[Waylander]

There is a 6000z bearing on the motor that learns to swim, and a bronze bush at the other end

A new motor these days is about $700, better to have a go at stripping it down, the top of the air box hast to come off to get the whole lump out

Partial Post: Please Login or Register to read the full post.

[RDKeysor]

Thanks so much.  I will be pulling the motor and disassembling it.  There is a very good video on You Tube with a German puling out the wiper motor on a 944.  Quite detailed. His situation was corrosion in the motor.  Cleaned it up, relubricated and sealed, and worked perfectly.  Yes, the air-handler hast to come out.  Thanks for the responses.

Partial Post: Please Login or Register to read the full post.

[RDKeysor]

A bit embarrassing to reveal that the howl was coming from one of the stainless steel stiffeners in the wiper blades scraping the windshield.  Yeah, I should have put the stethoscope on the the wiper motor, run it without blades, or whatever, but didn't.  Amazed that all of that noise came from that source.  I now have a polishing job to remove the slight scratch the blade left.  Had to get this off my chest.  

Partial Post: Please Login or Register to read the full post.

[Waylander]

Its very hard work polishing toughened glass, heat is the biggest problem,



I have used stuff from here to get marks out of side windows

I am sure you will be able to get the same stuff in the USA



https://glasspolishshop.com/

Partial Post: Please Login or Register to read the full post.

[vliegwielolaf1234]

A bit embarrassing to reveal that the howl was coming from one of the stainless steel stiffeners in the wiper blades scraping the windshield.  Yeah, I should have put the stethoscope on the the wiper motor, run it without blades, or whatever, but didn't.  Amazed that all of that noise came from that source.  I now have a polishing job to remove the slight scratch the blade left.  Had to get this off my chest.  

 

Quick fix then in the end .

 

The windshield , if it is still the original one in there , i would consider to replace , i did mine , and did polishing the old one before , it made it better , but far from new , i wish i would have replaced it earlier , it is so much better a new windshield .

Partial Post: Please Login or Register to read the full post.

[Roboman]

But you found the problem an it's not threatening the car, so you can fix it in your own time ..... good result.

Partial Post: Please Login or Register to read the full post.