 | Home > Technical > Defender wiper sweep |
 
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| grafty99 Member Since: 15 Aug 2012 Location: North Devon Posts: 4785   
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Sounds like a worn cable and/or wheel boxes to me
 2002 90 Td5 Station Wagon
1990 Vogue SE Triumph Tiger Explorer 1200 Td5 90 Thread http://www.defender2.net/forum/topic50767.html Tdi 110 Thread https://www.defender2.net/forum/topic69562.html RRC Thread http://www.defender2.net/forum/topic54492.html Instagram http://www.instagram.com/george_grafton |
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25th Jan 2018 8:04pm |
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| cee-b Member Since: 25 Jan 2018 Location: South West Posts: 117
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I did consider that Grafty, but I don't know how worn wheel boxes or cable would act on both wipers at the same time?
Or how it would EXTEND the sweep, rather than shorten it due to the drive being ineffective on the worn area? |
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25th Jan 2018 8:26pm |
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| ian series 1 Member Since: 17 Nov 2014 Location: south Posts: 3127 
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As Grafty said, it’s just component wear,
When the boxes and cable wear, it’s the slack that gives the wipers more travel, If you compare a worn cable and box to a new one, you will be supprised how much wear there actualy is. Simply replace the items for new ones and your wipers will be restored back to new. : 80" 80" 86" 88" 90" Wanted, Forward Control Anything considered. |
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25th Jan 2018 9:15pm |
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| cee-b Member Since: 25 Jan 2018 Location: South West Posts: 117
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Thanks Ian, I'm OK with that explanation - up to a point.
But, if it is wear how does it, at some random point, go instantly to the extended sweep and then, at some random point, go instantly back to working exactly as it should and then continue to do so until the next episode? Time between fault episodes might be minutes or it might be days (and it is raining pretty much all day, every day at the moment). In my experience, wear doesn't act like some kind of switching mechanism between fault and no fault. |
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25th Jan 2018 9:26pm |
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| grafty99 Member Since: 15 Aug 2012 Location: North Devon Posts: 4785
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The same reason that the sweep is smaller on a dry screen. Play or slack in the system. 2002 90 Td5 Station Wagon
1990 Vogue SE Triumph Tiger Explorer 1200 Td5 90 Thread http://www.defender2.net/forum/topic50767.html Tdi 110 Thread https://www.defender2.net/forum/topic69562.html RRC Thread http://www.defender2.net/forum/topic54492.html Instagram http://www.instagram.com/george_grafton |
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25th Jan 2018 9:32pm |
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| cee-b Member Since: 25 Jan 2018 Location: South West Posts: 117
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Yep, that explains a short sweep; I get that. Unfortunately, that is not the problem I've got
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25th Jan 2018 10:08pm |
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| grafty99 Member Since: 15 Aug 2012 Location: North Devon Posts: 4785
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What do you want us to say? Abnormal sweep is caused by wear! 2002 90 Td5 Station Wagon
1990 Vogue SE Triumph Tiger Explorer 1200 Td5 90 Thread http://www.defender2.net/forum/topic50767.html Tdi 110 Thread https://www.defender2.net/forum/topic69562.html RRC Thread http://www.defender2.net/forum/topic54492.html Instagram http://www.instagram.com/george_grafton |
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25th Jan 2018 10:13pm |
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| 300TDi CSW Phil Member Since: 03 Apr 2016 Location: Bracknell Posts: 750 
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Mine do it as well and it is on the list of things to be sorted.
When they "oversweep" it seems that the wipers are gliding over a film of water at the ends of the sweep and I presume their weight and movement is taking the slack up by gliding too far. 1995 300 Tdi Epsom Green - It's a keeper. Wide Track Sankey- In bits- Gone to a new home M0XQS |
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25th Jan 2018 10:14pm |
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| zsd-puma Member Since: 09 Aug 2016 Location: Kent Posts: 2720 
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the gears in the motor wear too.
Chances are there is cumulative wear in the whole wiper mech. |
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25th Jan 2018 10:25pm |
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| agentmulder Member Since: 16 Apr 2016 Location: Outer Space Posts: 1324 
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Consider yourself now more experienced
(It is odd, but they're not wrong in what they're saying) Solved the bowel problem, working on the consonants... |
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26th Jan 2018 2:14am |
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| cee-b Member Since: 25 Jan 2018 Location: South West Posts: 117
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OK, I'm grateful for all the responses; they all say the same thing and I'm going to go with it. "Abnormal sweep is caused by wear" is a good generic response and is perfectly correct. I just couldn't/can't figure out where that wear could be in order to produce the symptoms I have. I suppose I was hoping what someone would say was to come up with an experience, or at least a theory, that narrowed it down a bit. The wheel boxes are independent and, other than causing jerking or jamming that transmits down the cable to the other box, they can't influence each other. My problem occurs with both wipers simultaneously so (in my mind anyway) that pretty much rules out the wheel boxes? The same can probably be said for wear on the cable at the point(s) where the wheel boxes are driven from it. That leaves the motor worm drive, drive gear and the cable connection at the motor end being common to both wipers. I'll take the dash out and strip & inspect the whole system. While I'm in there, I may as well replace the wheel boxes and cable; they are 13 years old and will wear out sometime anyway. I might as well replace the motor brushes as well while I've got it stripped to check for wear. All I need now is some dry weather to get on with the job  Last edited by cee-b on 26th Jan 2018 11:29am. Edited 1 time in total |
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26th Jan 2018 10:53am |
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| cee-b Member Since: 25 Jan 2018 Location: South West Posts: 117
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26th Jan 2018 11:28am |
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| blackwolf Member Since: 03 Nov 2009 Location: South West England Posts: 17386 
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With the wipers switched off, lift the blades off the screen and with one in each had try moving them relative to each other. If there is wear in the wheelboxes and drive rack/cable there will be movement.
Then try moving them together against the motor. If you get more movement together than relative to each other, that is wear in the motor gearbox and crank. If they don't move at all in either test but you still get erratic sweep in operation, then your vehicle is possessed by demons and you need to get rid of it as a matter of urgency!  |
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26th Jan 2018 12:21pm |
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| cee-b Member Since: 25 Jan 2018 Location: South West Posts: 117
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Movement relative to each other - no.
Movement of both relative to the motor - yes. Possession by demons - I sometimes wonder .
The motor end is definitely the start point then; I might even get away without having to have the dash out? 
Edit: oops, no I won't get away with that - mine is a 2005, so not just a case of taking the end of the dash off  Last edited by cee-b on 26th Jan 2018 5:35pm. Edited 2 times in total |
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26th Jan 2018 12:35pm |
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