 | Home > Technical > Measuring front wiper sweep |
 
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| rallysteve Member Since: 10 Feb 2014 Location: Cumbria Posts: 2200   
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I would use a bit of trigonometry if i was you.
Get a chalk marker, put a dot at the end of the blade in the park position. Move the wiper to the extents of its sweep and put another dot. Now you can use a tape measure to measure the distance from the centre of the spindle to either dot, and the distance between the dots. You know have an isosceles triangle with all three side lengths known. You can then either divide that triangle into two right angled triangles and use pythagorus' theorem or just use the sin/cosine rule to work the angle out. Sounds worse than it is 
Steve 02' 110 TD5 Double Cab Rebuild Thread 84' 90 3.9 V8 Caged Pickup Build Thread - Now For Sale |
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30th Dec 2021 3:49pm |
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| geobloke Member Since: 06 Nov 2012 Location: Nottinghamshire Posts: 4410
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Yup I would say the easiest way is by protractor or OS orienteering compass. Make sure there is no slop in the system before doing the test by lifting the wiper arm and twisting it. If it is loose it might need a little tightening first.
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30th Dec 2021 3:51pm |
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| excossack Member Since: 22 Feb 2012 Location: North West Posts: 5745 
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Cheers both. I will take a look when its not peeing down! 1999 Defender TD5 110
Regards John M0VAZ Econet Station 48 no clock |
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30th Dec 2021 4:54pm |
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| geobloke Member Since: 06 Nov 2012 Location: Nottinghamshire Posts: 4410
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Get out there John you're not made of sugar ya know...
More seriously it is the perfect time to work out the angles from the drivers seat. Set the wipers going and take a compass out with you.  |
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30th Dec 2021 5:44pm |
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| Dinnu Member Since: 24 Dec 2019 Location: Lija Posts: 3213  
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Maybe you can measure the chord length at the top of the wipe... you know the distance from the wiper spindle to the tip of the wiper.. and do some math... in the age of the lazy, you can use one of the online calculators such as this:
(only need to measure two dimensions, keep the rest blank) https://www.handymath.com/cgi-bin/arc18.cg...wFormula=0 1988 90 Hard Top, 19J Diesel Turbo, Shire Blue - Restoration ongoing 2012 90 CSW, 2.2TDCI, Santorini Black |
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30th Dec 2021 6:35pm |
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| Linds Hanson Member Since: 16 Jan 2021 Location: Cornwall Posts: 443
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Sounds like you have the wrong wiper motor drive gear if its travelling too far, the pre 2002 models use a different ratio drive to wheel box then the post 2002 models
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30th Dec 2021 7:33pm |
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| ickle Member Since: 22 Jul 2010 Location: South Vendee Posts: 1728  
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If the circlip falls off the crank on the motor spindle, the bush falls out and centrifugal force effectively increases the sweep of the spindle and the travel of the rack and hence increases the angle of the wiper sweep, rubber hits screen surround etc....
HTH Keith |
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30th Dec 2021 9:20pm |
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| dorsetsmith Member Since: 30 Oct 2011 Location: South West Posts: 4554 |
517646 - Windscreen Wiper Motor Crank Gear - 115 Degrees (90/110 to 1A622423 2001)
DLW000020- Windscreen Wiper Motor Crank Gear - 140 Degrees From 2A622424 |
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30th Dec 2021 10:11pm |
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| excossack Member Since: 22 Feb 2012 Location: North West Posts: 5745
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Some good info there peoples and no, i am not made of sugar
 1999 Defender TD5 110
Regards John M0VAZ Econet Station 48 no clock |
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31st Dec 2021 10:18am |
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| geobloke Member Since: 06 Nov 2012 Location: Nottinghamshire Posts: 4410
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Well at least we now know you must be made of puppy dogs tails and hence a boy 🤪
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31st Dec 2021 10:22am |
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| DSC-off Member Since: 16 Oct 2014 Location: North East Posts: 1352 
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The easiest way to measure it with a protractor would be to extend the lines made by the extremities of the sweep and measure the angle between them. Perhaps use a rule and a non permanent marker to draw the lines on the glass.
 Click image to enlarge |
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31st Dec 2021 11:43am |
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| excossack Member Since: 22 Feb 2012 Location: North West Posts: 5745
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Nice bit of art work done in MSPaint
1999 Defender TD5 110
Regards John M0VAZ Econet Station 48 no clock |
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31st Dec 2021 11:49am |
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| DSC-off Member Since: 16 Oct 2014 Location: North East Posts: 1352
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Artwork is Samsung Penup app, first try with it, but I think it will be handy.
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31st Dec 2021 11:57am |
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| excossack Member Since: 22 Feb 2012 Location: North West Posts: 5745
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I followed the DSC-Off method and got a measure of 115 degree's or there abouts. There was some play in the grub screw that holds the splined adapter on, so tightened this up.
There is some play in the wheel box(not sure how much there should be) 1999 Defender TD5 110 Regards John M0VAZ Econet Station 48 no clock |
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16th Jan 2022 1:40pm |
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