Talk Morgan Forums Morgan Sports Cars Morgan Plus Four, Supersport & Plus Six (CX & CXV Generation Vehicles) Plus Six wiper judder - advice requested

Smart suggestion Jon. TY. Dave? This should be added to your list. Got a multimeter handy?

Additionally, I have been told you should check the wiper motor. They're should (hopefully) be a supplier sticker on it. If not.....

L.

P.S. Still waiting for the Factory to respond.

Evening Jon and Lorne.. Rgr on the volt check, however the CX design has the wiper motor buried deep behind the dash, which all has to come out to gain access to it.. Its not easy to access to the motor and linkage as with a Trad.

However, I can say that one of the cars warranty issues was electrical strangeness. The fix undertaken by the dealer with considerable factory support ( the fix took some time! ) was to remake all the earths on the car, this did solve the issues and ( fingers crossed) there has been no more repeat electrical stangeness, it all seems to work very well since.. Also consider that the factory themselves have had the car twice to sort the wiper issue and I was told by the dealer that the total system had been replaced...although finding that at least one of the wiper "boxs" was an original has not filled me with a lot of confidence in the dealer statement. Lastly, also consider the judder was way worse with the original MMC wiper blades..

Sorry Dave for only getting back to you now.
This is a very interesting thread. I also think that problems and especially the solutions for the CX generation are presented here.
My PlusFour is mothballed ( is that right in English ?) in another garage and I only got around to looking there today to see if the wiper arms has play or not. I think that the design of a PulsFour is the same as that of your PlusSix.
My windshield wiper does not judder. The wiping result in heavy or light rain is good.
All three wiper arms have no side play.
According to my technical understanding, this may be the reason for your juddering.
What I do have, however, is a scratch in the windshield caused by the windshield wiper. I was also wondering whether the pressure of the wiper blades on the windshield is not too great. The scratch is difficult to see in the second photo

I have the same problem with my CX Plus Four, no matter which blades I use, the original factory ones or the newer version it won’t flip over as it should, my thinking is that the wiper arm spring is wrong it’s far too strong for the small arm, I have tried to remove the spring but it’s bittern back, I’ll try again when my hands heal up.

Another set of random thoughts:

Looking at the diagram above, there is a lot of leverage between the cross shafts and the spindles. Any play would cause a problem. Also, are the spindles fixed into the car securely - i.e. is the play from spindle to housing or from housing to car?

I think the old (trad) Morgan wiper rack had a lot less leverage between actuator rack and spindle.

I would not be surprised if, when you conduct the arm removal experiment to see if one blade is worse than any other, that you find it to be one of the blades nearest the motor. The arrangement shown will have forces flying in all directions if there is any slack.

Hoping this is helpful.

I would now try removing the internal spring inside the arm of just one of them, stick it in a vice and 'overstretch' it, refit and see if that arm/blade combo is better than the original two

Sorry for the delay getting back online, I had a full day out yesterday walking in the countryside and no computers. To answer and ask some questions.

AA; Clemens, thank you for checking your wiper arms, the Plus Four arms looks very very similar to the Plus Six. The fact that you have zero side play on the wiper arm ( and no judder ) is very interesting. All three of my wiper arms have at least 10mm side to side movement if held at the blade end and moved side to side. The scratch on your screen appears bad.. looking at your photo it appears the wiper blade rubber itself is not set at 90 deg to the screen glass, so one side of the wiper blades metal work would be presented much closer to the glass in direction of wipe and could easily cause the scratch. The way to rectify this is to bend the wiper arm at the blade end to have the rubber of the blade sitting correctly, your picture appears to show the flat end of the arm angled slightly toward the glass, that is why ( I think ) the blade itself has caught the glass. I would strongly suggest to talk to your dealer over this if the car is still in warranty, this sort of detail should have been checked at the factory or vehicles PDI. Bending the wiper arm to allow the wiper blade to sit correctly is not for the faint hearted, but it is relative straight forward with the correct tools.
I also note that your wiper blades are the same design or similar to the aftermarket type I have, so if it is factory fitment they must have changed to that type of more modern design.

BB: P8Mog. Just to confirm, are you saying that your Plus Four blades judder??. If so, have you checked to see if you have any side to side play at the wiper arm fulcrum pin when holding the wiper arm at the blade end?. I note you had tried to reduce the wiper arms spring tension, I would agree that it is very strong and the spring is tricky to access.

CC: Paul.. The CX wiper linkage is built very robustly and uses " rose joints" at all the swivel points, these are high standard joints and do not allow any play. I can detect zero play in our cars mechanism other than the side play seen on the wiper arms themselves. The spindle housing "wiper box" should be fixed very securely to the panel, if it is not, then I can confirm the mechanism will try and move itself out of the car!. Our cars second factory visit prior to Xmas for wiper issues was because of wiper judder and the fact that the near side spindle housing nearest the motor had became loose and could not be secured. The factory sorted this part of the issue but our wiper judder has returned.

I am off in a moment to spray soapy water on the Plus Six screen and see if that reduces or stops the judder.. I will report..

Sure would appreciate some more owners of CX cars to check for side play on their wiper arms by holding the wiper arm just off the screen at the wiper blade end and trying to move it side to side. Trying to build up info to see if play at the arms fulcrum pin is normal or not.

Dave

Ok, results..

1. Windscreen sprayed with soapy water ( hand soap and water mix ), this eliminated 90% of the judder.
2. The judder movement can be seen in the play at the fulcrum pin on the wiper arm, as the wiper blade judders the arm section that goes to the blade from the fulcrum pin is moving ( juddering ). By placing my finger against the arm and slightly loading it to reduce movement during operation removes nearly all the judder when combined with soapy water spray.
3. After the soapy water test it revealed that the screen must have had a coating applied to it as some time ( dealer/factory?? ) as it can be seen and will not come off by hard rubbing with a clean micro cloth. The coating is partial and in some places is missing in the wiper arcs..

As things stand, I believe my course of action is to do as follows.

When the windscreen cleaning products arrive, I will thoroughly clean, clay bar and polish the windscreen so no coating can be seen on it. Plus reclean the wiper rubbers. Then test the wiper action for judder.. if its still there it may be time to spend £200 and replace all three wiper arms. Hopefully in the mean time more CX owners ( or the factory?? ) will be able to confirm if movement at the wiper arm fulcrum pin is normal or not.

Hi Dave, just had a quick check of the wiper blade assembly, no real play in the arm pivot pin area, slight slack in the spline shaft.
I have always had some degree of wiper judder on all the Morgan’s I have had, the CX is no exception. I have the updated blades, but don’t do that much driving in the wet. Tend to use on intermittent wherever possible, only using constantly if it’s very wet, using the washers for occasional lubrication.

Hi Dave,
I don’t any movement in my fulcrum pins, and I do have judder mostly on the drivers side.
Keith.