Problem with 90 windscreen wipers..

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McBad - 23 Apr 2005 17:03 GMT

Every 10 or so wipes my wipers will go a few extra inches and hit the top of
the bulkhead. It's not regular as clockwork, just every dozen wipes or so,
the rest of the time the wipers cover the normal arc. Does anyone know why
this is happening and how I can stop it happening? Can't be doing the
wipers any good and with the amount of rain we've been having lately I don't
want them failing on me.

thanks,

M.

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Dougal - 23 Apr 2005 17:54 GMT

> Every 10 or so wipes my wipers will go a few extra inches and hit the top of
> the bulkhead. It's not regular as clockwork, just every dozen wipes or so,
[quoted text clipped - 6 lines]
>
> M.

The angle of wipe is mechanically controlled. If the normal arc is being
exceeded something is slipping. Start with the easy bit and check that
the arm is not slipping on the drive spline, then that the drive spline
is securely attached to the wheelbox output shaft. Beyond that it'll be
less easy - gearbox on the motor, wheelbox or the drive 'cable' and
you'll probably have to dismantle progressively to diagnose these.

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Austin Shackles - 23 Apr 2005 19:41 GMT

>> Every 10 or so wipes my wipers will go a few extra inches and hit the top of
>> the bulkhead. It's not regular as clockwork, just every dozen wipes or so,
[quoted text clipped - 13 lines]
>less easy - gearbox on the motor, wheelbox or the drive 'cable' and
>you'll probably have to dismantle progressively to diagnose these.

's usually wear, rather than slip - the more floppy all the bits get, the
further beyond "normal" the wiper can go - the wetter the conditions, the
more likely it is to go too far as well. You can try moving the wiper
areound on the shaft a tad, but that might just make it hit the screen side
pillar instead.

I think the only sure-fire cure is to replace the flexible drive and the
wiper shaft units... which is probably more effort and expense than you
want.

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Austin Shackles. www.ddol-las.fsnet.co.uk my opinions are just that
If all be true that I do think, There are five reasons we should drink;
Good wine, a friend, or being dry, Or lest we should be by and by;
Or any other reason why. - Henry Aldrich (1647 - 1710)

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Dougal - 23 Apr 2005 20:51 GMT

>>>Every 10 or so wipes my wipers will go a few extra inches and hit the top of
>>>the bulkhead. It's not regular as clockwork, just every dozen wipes or so,
[quoted text clipped - 23 lines]
> wiper shaft units... which is probably more effort and expense than you
> want.

I'd considered that - but concluded that as the complaint was of
'occasional' misbehaviour it didn't really fit the bill. On the other
hand high friction events on a drying screen could well result in spline
slippage. Gear/shaft jumping would create noise which hasn't been mentioned.

Either way, if the easy problems are eliminated it's going to be hard work.

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Austin Shackles - 23 Apr 2005 21:04 GMT

>I'd considered that - but concluded that as the complaint was of
>'occasional' misbehaviour it didn't really fit the bill. On the other
>hand high friction events on a drying screen could well result in spline
>slippage. Gear/shaft jumping would create noise which hasn't been mentioned.
>
>Either way, if the easy problems are eliminated it's going to be hard work.

Mine on the 110 would wipe a small-ish arc on a dry screen, and a larger one
on a wet screen, and an intermittent one on a not-very-wet screen. The play
in the drive allows the arm, once moving, to flop down further not under
power, if the screen's wet enough. Or that was my interpretation. simple
way to check, though, start the wipers going, kill the ignition with 'em
half-way up the screen, and get out and see how much you can move the arm.
On mine, there was a good 3" movement at the blade tip.

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Austin Shackles. www.ddol-las.fsnet.co.uk my opinions are just that
"The woods are lovely, dark and deep. But I have promises to keep,
And miles to go before I sleep."
Robert Frost (1874-1963) from Stopping by Woods on a Snowy Evening

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MVP - 23 Apr 2005 21:25 GMT

>>I'd considered that - but concluded that as the complaint was of
>>'occasional' misbehaviour it didn't really fit the bill. On the other
[quoted text clipped - 10 lines]
>half-way up the screen, and get out and see how much you can move the arm.
>On mine, there was a good 3" movement at the blade tip.

mine behave similarly ref the wet/dry.
with screenwash or much rain the blades touch the rubber screen trim,
when dry they stopan inch or two short.

Regards.
Mark.

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_________________________________________
1984 110 CSW 2.5(na)D
(3,000 rivets flying in close formation)
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Dougal - 23 Apr 2005 21:35 GMT

>>>I'd considered that - but concluded that as the complaint was of
>>>'occasional' misbehaviour it didn't really fit the bill. On the other
[quoted text clipped - 17 lines]
> Regards.
> Mark.

That's definitely the wear problem.

The wear can often be treated by turning the rack through 180 degrees at
the motor. This presents (unless it's already been tried before!) an
unworn part of the rack to the gear at the wheelbox. It's a cheap
solution if it works. It should work at the wheelbox, too.

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Dougal - 23 Apr 2005 21:48 GMT

>>>> I'd considered that - but concluded that as the complaint was of
>>>> 'occasional' misbehaviour it didn't really fit the bill. On the
[quoted text clipped - 32 lines]
>
> It should work at the wheelbox, too.

That's less than clear! Disengage the gear at the wheelbox and turn it
through 180 degrees to expose the unworn (subject to the previous
proviso) side of the gear to the rack. Rather easier to say than to do -
mark the position of the gear relative to the wheelbox casing before
dismantling and don't disturb the other end of the rack until it's all
reassembled.

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McBad - 23 Apr 2005 23:46 GMT

> >>>> I'd considered that - but concluded that as the complaint was of
> >>>> 'occasional' misbehaviour it didn't really fit the bill. On the
[quoted text clipped - 39 lines]
> dismantling and don't disturb the other end of the rack until it's all
> reassembled.

Interesting concept. I haven't noticed any odd noises associated with the
wiper system, other than the thud as the wiper hits the bulkhead. Turning
the gear around sounds like a good idea; I'll consult my manual tomorrow and
perhaps have a go at sorting it out (if it's not raining).

Cheers,

M.

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