Wiper motor linkage sync question

[Zlornick]

Just replaced the wiper motor with a new unit and am having trouble getting the linkage re-attached and synced up. It seems that from park position, they go up to full back down past the end of the windshield and then considers "park" somewhere in the middle of the cycle again. Can't find anything about this behavior online. Any suggestions? is there an adjustment I'm missing?

[loki_the_glt]

I'm not sure about the 240, but when I replaced the system on my 940 I let the motor run through a couple of cycles to establish its self-parking position before refitting the wiper arms.

On that car there's a cable that secures to a pulley on the arm that's NOT attached directly to the motor; there is a slot cut in the linkage for one end of the cable and a cut-out in the pulley that the otherend of the cable fits into. Grease this cable then check its routing - it should run round the pulley then out to the linkage.

I did a write-up that appeared in the December 2019 issue of the "Driver" magazine that might help you.

[Clifford Pope]

I don't think the 240 system is quite like that.
I recall that there is a wheel with a slot in it which bolts onto the motor spindle. If you haven't dismantled any of the lever system then all you have to do is put the wheel back on the (new) motor. There are only two ways round it will fit, so if you run the motor until it parks itself and the arms are in the park position, that determines which way is which.

[rustytoba]

Ditto mine did that just took the motor out of the scuttle to do some light rust repair then reinstalled it and wham, up and down as it should but parked halfway up.

Scott

[Clifford Pope]

I've just been out to examine a spare motor. My apologies - it is a lever not a wheel. But behind the bolt on the end of the motor spindle there's a slot in the lever. You could fit it the wrong way round - if you have moved the blade position for example - so you position them in park and then run and stop the motor, and then reconnect.

[davidcheshire]

Not sure if I have understood Zlornick's problem, but when I had to replace the motor, and had the same result as the picture by Rustytoba, my solution was to let it park and then remove and reposition the wiper blades in the park position.

However, I have the feeling that it's too simple to be the answer to your problem.

David.

[rustytoba]

Unfortunately that causes them to park half way down the skittle.

There will be a way to fix it but I'm of a school of thought that wipers parking too high are far better than no wipers at all.

Scott

[Clifford Pope]

I don't understand how if the wipers were fine before the motor failed, simply replacing the motor doesn't still park correctly. There doesn't seem to be anything else that can go wrong apart from connecting the crank on the motor 180 degrees wrong.
There are three components here:

1) It's the motor that decides when to park. There's a third connection that gives power for a while when the main switch is turned off, for long enough to return the motor to the rest position, until the contact runs out of track and switches off. If the motor always self-parks itself reliably in a consistent position, then that has to be the starting point for all the subsequent mechanism.

2) The linkage takes the drive to the spindles. If that hasn't broken or been reassembled or fiddled with then it can't be wrong. Turn it until to the end of its travel, in the park position, and then connect to the motor crank.

3) Fit the blades in the park position.