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| jeffersj Member Since: 23 Jan 2015 Location: Near Preston Posts: 431   
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Thought I would use this isolation time replacing the wheel boxes and cable. Everything fitted OK but the wipers are going the wrong way and parking at the top so I stripped the motor again and ensured the large cog and connector rod were at the bottom just as it came off. I followed the step by step picture guide in the workshop part of an old LROI and all seemed as it should be.
So I put it all back together and same again the wipers are going the wrong way and parking at the top. Could this be the park switch, would that send the wipers the wrong way or what am I doing wrong. (have searched under wiper woes but there is too much to wade through) Could I have put the wheel boxes upside down would that make the wiper go he correct way? although they matched the pictures in the LROI guide? 300TDi Jeff Ex 1968 Series 2A Ex 90 TD5 Ex D3 Ex D4 |
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4th Apr 2020 4:35pm |
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| jeffersj Member Since: 23 Jan 2015 Location: Near Preston Posts: 431
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Well took it all apart again, set the cog and con rod at the bottom of the cycle so that the first movement would be to push the cable and therefore move the wipers from the bottom of the windscreen to the top.
All seemed fine at first attempt with no wiper arms on and spindles were moving the correct way until I switched them off when I switched them back on again they started going the wrong way so now I am convinced that the Park Switch is at fault although it was working fine before I started messing around. Please can anyone suggest what is wrong? Jeff Ex 1968 Series 2A Ex 90 TD5 Ex D3 Ex D4 |
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5th Apr 2020 11:14am |
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| blackwolf Member Since: 03 Nov 2009 Location: South West England Posts: 17348 
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Have you fitted the wheel-boxes the wrong way up by any chance?
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5th Apr 2020 11:17am |
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| jeffersj Member Since: 23 Jan 2015 Location: Near Preston Posts: 431
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Blackwolf
I was following the LROI step by step picture guide which shows the rack on the top but I must admit that when i took the old ones off I thought that the rack was at the bottom. I had stripped them a few days before the new boxes arrived and was not sure which way they went until I looked the magazine and they had the rack at the top. Indeed I had fitted the boxes with the rack at the bottom but they fitted better at the top after looking at the mag. So that might be the problem then? Jeff Ex 1968 Series 2A Ex 90 TD5 Ex D3 Ex D4 |
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5th Apr 2020 11:31am |
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| T140 Member Since: 15 Mar 2016 Location: Ayrshire Posts: 173  
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when I changed mine I'm certain they were at the bottom nobody is perfect but being Scottish is a start
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5th Apr 2020 1:03pm |
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| blackwolf Member Since: 03 Nov 2009 Location: South West England Posts: 17348
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It is the only thing I can think of that would have the effect you describe.
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5th Apr 2020 1:37pm |
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| blackwolf Member Since: 03 Nov 2009 Location: South West England Posts: 17348
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^^^ Which is exactly what the OP is describing.
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5th Apr 2020 1:46pm |
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| jeffersj Member Since: 23 Jan 2015 Location: Near Preston Posts: 431
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Well I have spent the last few hours turning the wheel boxes so that the rack is at the bottom. moved the con rod to the top of the cycle so that first movement was to pull thus lifting the wipers, worked fine for one sweep and then just stopped and started in different places in when switched on and off.
The park switch might have been damaged with the messing about. It is a 96 Defender but was rebuilt by the previous owner in 2012 with a TD5 dash and looks like they have filed a bit of the dash support away to allow the rack to be at the bottom, so I have had the rack at top and bottom it sits better at the top but either way it has made no difference. The motor is a Lucas. I'll try a new park switch and see if it makes any difference. Unless anyone can think of anything else I can try in the meantime( it would be OK for a LHD motor. Thanks so far! Jeff Ex 1968 Series 2A Ex 90 TD5 Ex D3 Ex D4 |
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5th Apr 2020 2:44pm |
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| jeffersj Member Since: 23 Jan 2015 Location: Near Preston Posts: 431
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I decide to have a look at the old wheel boxes and with a piece of offset cable moved the cogs. With the rack in the top position the push cycle turns the wheel the correct way, when I turn the box to have the rack in the bottom position the push cycle turns the wiper the wrong way.
I have therefore decided to move the boxes so that the rack fits in the top position and hope that a new park switch will help. thanks fo or your inputs! Jeff Ex 1968 Series 2A Ex 90 TD5 Ex D3 Ex D4 |
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5th Apr 2020 4:15pm |
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| blackwolf Member Since: 03 Nov 2009 Location: South West England Posts: 17348
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I'm struggling to understand why this is proving so problematical!
The park switch is operated by a cam on the back of the worm wheel (what you call the "large cog") as I recall, so this wheel will always stop in the same position, and it will always rotate in the same direction. It actually doesn't make a blind bit of difference in what position you assemble the worm wheel in the motor when you put it together, because as soon as you apply power the motor will run to the park position. You can assemble it with the link at the top, the bottom, 3 o'clock, 9 o'clock, or twenty-past six, it will still just run to the park position! With the wheelboxes connected to the drive rack, and the drive rack connected by its crank to the worm wheel, the wiper spindles will also always stop in the same position irrespective of how you assemble the motor. So put it together, and watch what happens when you switch the motor on. If, when viewed from the front of the vehicle, the wiper spindles initially more anti-clockwise from the park position, then the wheelboxes are correctly assembled. If, when viewed from the front of the vehicle, the wiper spindles initially move clockwise from the park position, then the wheelboxes have been fitted upside down. (If the spindles move in different directions then one wheelbox is upside-down and you've recreated the linked wiper arrangement used on Series vehicles with opposed wipers.) If the spindles are parking in different random positions each time you switch the wipers off, or if they don't stop at all when you switch the wipers off, then you have a defective park switch. |
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5th Apr 2020 6:26pm |
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| Retroanaconda Member Since: 04 Jan 2012 Location: Scotland Posts: 2637
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I believe you can move the ‘ramp’ that triggers the park switch to two different positions on the gear in the motor relative to the pin that the drive cable attaches to. This means that you can set it so that the motor either pushes the cable out, pulls it back and stops (pre-2002) or pulls the cable back, pushes it back and stops (2002-on).
This is one of the reasons that the drive gear in the motor differs for the two different systems, the other being that the relative diameters of the wheelbox and drive gears are different, although a mismatch here just causes an incorrect arc of blade sweep rather than going the wrong way. The OP’s vehicle sounds like a bit of a mismatch so it’s hard to determine what is required. |
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5th Apr 2020 8:31pm |
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| blackwolf Member Since: 03 Nov 2009 Location: South West England Posts: 17348
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I am rather assuming that (a) it worked before, (b) he hasn't taken the park switch cam off the worm wheel, and (c) he hasn't changed any of the moving parts in the motor (such as the worm wheel).
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5th Apr 2020 8:50pm |
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| jeffersj Member Since: 23 Jan 2015 Location: Near Preston Posts: 431
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Blackwolf and Retro believe me I am at a loss to understand what is happening also. Your explanation is excellent and makes sense as I have tried both top and bottom rack fittings and observed movement of spindles hence thinking of the worm wheel either pushing or pulling, as you say I have not touched the ramp (would not know how to) as Retro mentioned or the worm wheel, I have only changed the wheelboxes and cable.
The motor and old wheel boxes were Lucas probably bought 2012 for a 96 300Tdi but fitted to the td5 dash on rebuild so as retro says it is bit of a mismatch. I did take the park switch off to examine contacts etc and a small bit of white plastic dropped out, the plunger was still working so thought nothing of it but have ordered a new switch as a precaution. Going out now to play with it again fortunately retired so my time is "free". I will let you all know the outcome when the new park switch is fitted later in week. Once again thanks! Jeff Ex 1968 Series 2A Ex 90 TD5 Ex D3 Ex D4 |
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6th Apr 2020 10:52am |
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| jeffersj Member Since: 23 Jan 2015 Location: Near Preston Posts: 431
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Blackwolf and Retro the saga continues. New Bearmach park switch fitted no change! the wipers stop when they are switched off and do not return to park position (mind you the spring clip on the park switch came loose as soon as I pushed it into place and the only way I could get it to stay in tight was to wedge a bit of wood in the slot behind it) so maybe there are other defects with it. Have contacted the supplier for his views.
I checked relay and swapped it with a spare, no difference so my search continued to wiper switch (stalk). The intermittent will now not switch off and washer button sticks in, button has done so for a while. This was bought only over a year ago so will try a new one. Examined stalk but no signs of burning or wear so we shall see. Unless you guys can think of anything else, at least fitting rack at the top means wipers go the correct way. Jeff Ex 1968 Series 2A Ex 90 TD5 Ex D3 Ex D4 |
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8th Apr 2020 4:12pm |
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