 | Home > Technical > Wiper motor park switch |
 
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| agentmulder Member Since: 16 Apr 2016 Location: Outer Space Posts: 1324  
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Wiper fault that unless I'm mistaken is not quite like the others already discussed..
Intermittent fault that happens only when it's raining very hard (  ).
Anyway, so the wipers wont find home on the downwards stroke, they will instead continue so far as the left wiper sits on the window seal. They do however work fully in every other regard in all modes. They will even 'droop' on one wipe then land correctly on the next and so on. Happens both when running and on the final stroke after having been switched off - i.e. there is no 'it stops right there' issue. I have swapped out the relay to the Bosch programmable delay type and the fault continues. As per every other thread I'm going to have a play with the park switch (520160/LR057182) - just wondering if anyone else has any tips regarding this one? Getting close to my ideal vehicle, so now its time for stuff like this  Solved the bowel problem, working on the consonants... |
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2nd Feb 2017 5:57am |
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| Martin Site Admin Member Since: 02 Apr 2007 Location: Hook Norton Posts: 6605  
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Sounds like a mechanical rather than electrical issue. The park switch only comes into operation to park the wipers, so as it is happening during wiping and at the end, it cannot be the switch allowing the wipers to overshoot.
Probably worn wheelbox/boxes and/or rack. Can you move/rotate the wipers by hand at all, any slack in them. I had this on my soft top and replaced the wheelboxes and rack last year. They were 28 years old thought not 8   1988 90 Td5 NAS soft top
2015 D90 XS SW |
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2nd Feb 2017 7:25am |
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| agentmulder Member Since: 16 Apr 2016 Location: Outer Space Posts: 1324
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I suspect I can rotate them, although I'm not really keen to try
I do wonder how they go to far some of the time though, not saying it's impossible - guess it will be interesting to learn what's going on. Once day soon I'll open it up and have a look. Dang, should have done it with the windshield out earlier today! (hit a pheasant at 100kph last week..) Solved the bowel problem, working on the consonants... |
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2nd Feb 2017 7:46am |
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| Martin Site Admin Member Since: 02 Apr 2007 Location: Hook Norton Posts: 6605
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Just give the wiper arms a tickle (rotate them) and see if there is backlash
1988 90 Td5 NAS soft top
2015 D90 XS SW |
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2nd Feb 2017 8:04am |
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| blackwolf Member Since: 03 Nov 2009 Location: South West England Posts: 17382 
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As Martin says this is almost certainly wear in in either the wheelboxes or in the crank of the motor, or both.
If the two wiper arms can "wiggle" independently of each other, of if one "wiggles" more than the other, it suggests one or both wheelboxes. If the two wipers seem fairly well linked but both "wiggle" when parked it suggests wear in the cranked drive in the motor. By "wiggle" I mean manipulated by hand with the blade lifted of the glass. The good news is that the gear, crank, drive cable, and wheelboxes are all reasonably inexpensive, though they are a bit of a faff to fit on a Puma. Incidentally cheap quality (eg Halfords) wiper blades can cause a similar effect since they tend to be loose on the arms and can skew relative to each other, creating an effect similar to one travelling further at end-stroke than the other. the blades that Halfords sells for Defenders are also longer than the original and will almost certainly hit the screen seal at some point. I have a pair at the moment and I am really not too impressed (but in all honesty few Halfords products impress me except for the pro range of tools, which are surprisingly acceptable. But that is another story and irrelevant to this thread). |
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2nd Feb 2017 8:45am |
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| ickle Member Since: 22 Jul 2010 Location: South Vendee Posts: 1782  
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AM
Mine did this - the circlip on the crank had come off allowing the bush to move and hence alter the arc of the wipers, as it was stripped out anyway I replaced all of the bits and switch for good order, re greased the mechanism and turned the gears 180 degrees at the spindles. Good luck Keith |
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7th Feb 2017 6:34pm |
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| agentmulder Member Since: 16 Apr 2016 Location: Outer Space Posts: 1324
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Thanks for the tips from someone who has had similar!
I'm really keen to only open up the dash once - done it before, and it's a right PITA - any chance you could give me a run down on what parts I should expect to need to swap out? Click image to enlarge This diagram from: https://www.landroverworkshop.com/diagrams...sher_44954 So far I've only ordered DLE000010 'Wiper rack' but the diagram makes it hard to determine what it mates with what and how, so aside from ordering it all ($) I'm a bit clueless as to what would be the wise selection. Any advice greatly appreciated Solved the bowel problem, working on the consonants... |
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7th Feb 2017 7:40pm |
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| agentmulder Member Since: 16 Apr 2016 Location: Outer Space Posts: 1324
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Also, to answer your questions:
- The slop (backlash) on the wiper arms is about the angle it droops (occasionally). - They appear well synced with each other however - i.e. not much slop between arms - it's more slop between the arms (as a 'unit') and the driving mechanism(s). Forgive my ignorance as I am yet to open it up but does this mean the rack is likely ok? Solved the bowel problem, working on the consonants... |
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7th Feb 2017 8:25pm |
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| ickle Member Since: 22 Jul 2010 Location: South Vendee Posts: 1782
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It was the assembly number 4 that fell apart - no parts were needed but I bought item 4 plus a park switch as they seem to fail and replaced them / greased them as required. There was another member on here who had the same and using Blackwolfs excellent write up, it wasn't hard or take more than a couple of hours.
Keith Edit: the circlip came off the end of the crank pin, the bush then moves out of the hole in the arm, allowing the crank pin to run eccentrically in the hole causing all sorts of slop and movement - all item 4 |
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7th Feb 2017 8:34pm |
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| agentmulder Member Since: 16 Apr 2016 Location: Outer Space Posts: 1324
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Thanks ickle, really helpful
Goes without saying blackwolf has been a great help here and elsewhere also
Gotta love this forum! Solved the bowel problem, working on the consonants... |
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7th Feb 2017 8:42pm |
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| agentmulder Member Since: 16 Apr 2016 Location: Outer Space Posts: 1324
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Finally got around to this today..
I'm about 90% sure it was the crank arm connection to the main gear, all parts appear to be there, but the arm was loose compared the replacement. I'd clean it and see, but too busy at the moment. The old rack appeared fine but I replaced it anyway as the work involved in getting in there is not worth saving the $$ not using what I've already bought - so I guess I have a spare - I see how you can flip them over anyway so I effectively have 4 working units now ha ha
If you are thinking about doing this it's pretty easy, but you do have to be 'defender minded' and yeah about 2hrs is accurate. As an aside it's a lot quieter now too, funny what you don't notice until it's gone. Solved the bowel problem, working on the consonants... |
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25th Apr 2017 8:27am |
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| Proker911 Member Since: 06 Dec 2011 Location: SW France Posts: 1
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Had to thank Blackwolf - without his post and guide I would not have had the confidence to take out the dash.
I had to replace my entire wiper mechanism because that tiny rubber grommet was missing that stops water going down the wipoer shaft - my entire mechanism was full of rust and grit and the drive gear teeth had worn out SO EVERYONE Check you have this grommet see pic. For any LHD puma folks you can remove the entire mechanism just by pulling the dash back as suggested. mechanism is identical for both LHD and RHD same park etc. Couple of tips glue the rubber pad behind the motor onto the bulkhead with contact adhesive partially screw in the far side (left) bolt through the motor U clamp makes putting the motor back MUCH easier You can not remove the RH screen blower duct unless the motor is loose so put that back before you tighten the motor Here is a list of parts that were removed to gain access if its not listed it stayed in situ. Entire Center panel incl Radio Grab handle Top of speedo pod small strip of facia below speedo pod Speedo pod Upper and lower trim on steering column RH side tweeter (tie a bit of string to the wire as its very short and keep it threaded through the hole All screws around the dash but not the ones directly in front of the gear shifts. Good luck |
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9th May 2017 11:12am |
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