RK
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| posted on 16/11/09 at 01:04 PM |
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wiper motor weak
Seems my wiper motor is too weak to wipe once the wipers are on. Without them, it does what it is supposed to. Is my motor pooched?
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BenB
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| posted on 16/11/09 at 01:12 PM |
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Are the rocker boxes and the wiper gears well greased?
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prawnabie
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| posted on 16/11/09 at 01:13 PM |
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I have the same problem with mine. I have come to the conclusion that by shortening the wipers I have increased the clamping force of the blade on the
screen, putting the motor under more pressure.
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Bluemoon
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| posted on 16/11/09 at 01:23 PM |
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Have you used steel (bundy) tube or copper (if lucas mini type unit), Copper can cause more drag..
Have you tight bends in the tube? Is the tube collapsed on the bends making it tight?
Also as above, try running with the blades off, is it still slow (if so it's not the wipper blade pressure)..
Did you run it with the wipper blades dry? If so this will slow the motor, wet the screen and try again..
Dan
[Edited on 16/11/09 by Bluemoon]
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RK
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| posted on 16/11/09 at 01:24 PM |
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Will try putting more grease in. Speed normal and fast as per normal when no wipers.
Fairly straight line from motor to farside box.
[Edited on 16/11/09 by RK]
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Humbug
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| posted on 16/11/09 at 04:34 PM |
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I have just fitted a screen and wipers and found it is a bit of a strain on the wipers unless the screen is quite wet. Talking to some locosters at
the weekend the consensus was that the springs are too heavy for the short arms, so the wipers are pressed against the screen a lot more than longer
blades would be.
I am going to look for some lighter springs.
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iscmatt
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| posted on 16/11/09 at 04:41 PM |
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quote:
Originally posted by Humbug
I have just fitted a screen and wipers and found it is a bit of a strain on the wipers unless the screen is quite wet. Talking to some locosters at
the weekend the consensus was that the springs are too heavy for the short arms, so the wipers are pressed against the screen a lot more than longer
blades would be.
I am going to look for some lighter springs.
exactly what he said. i only have an issue with when the screen is dry, i quick press on the washers to wet the screen and the blades and they work
fine again
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britishtrident
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| posted on 16/11/09 at 07:16 PM |
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Short wiper arms should require much less torque to drive them.
Most likely thing is the wheel boxes are seized up this used to happen a lot on cars with this type of wiper.
You really need to take the whole mechanism off distmantle it and clean it out and soak the wheel boxes in Duck Oil/WD 40 and and work them untill
you can spin them easily with your fingers.
The tube should be cleaned out and cable wire brushes then tube cable & gear lubricated with CV joint grease.
The wiper motor crank mechanism should be lubricated with lithium grease.
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scudderfish
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| posted on 16/11/09 at 09:14 PM |
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I failed my MOT with this. I stripped it all down, cleaned it, greased it & straightened out the tubes. The connections on the plug were
corroded and the wiring was warm, so I replaced that with some higher gauge stuff. I can now launch bowling balls into orbit with my wipers.
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Humbug
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| posted on 18/11/09 at 06:34 PM |
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...following on from the above, I looked for some weaker springs to go in the arms with no luck, so I stretched the springs a bit to make them looser,
and now it seems much better. I left the springs in the arms and gripped the straight bit of the spring (between the curly bit and the end hook) with
a pair of pliers. I straightened them (mine had a slight bend to allow the springs to move when removing the arms from the car) and pulled a bit to
give a permanent stretch. Now, when the arms are off the car they are slightly slack, but when on the car they have enough spring to hold the blades
nicely on the screen without dragging.
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MikeRJ
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| posted on 18/11/09 at 06:43 PM |
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quote:
Originally posted by HumbugNow, when the arms are off the car they are slightly slack, but when on the car they have enough spring to
hold the blades nicely on the screen without dragging.
You may find they are completely ineffective when actually driving however!
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