Problem with 90 windscreen wipers..

M

McBad

Guest

• Apr 23, 2005

• #1

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.

 

D

Dougal

Guest

• Apr 23, 2005

• #2

McBad wrote:

> 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.

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.

 

A

Austin Shackles

Guest

• Apr 23, 2005

• #3

On or around Sat, 23 Apr 2005 17:54:32 +0100, Dougal
<DougalAThiskennel.free-online.co.uk> enlightened us thusly:

>McBad wrote:
>
>> 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.
>
>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.

'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.
--
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)

 

D

Dougal

Guest

• Apr 23, 2005

• #4

Austin Shackles wrote:

> On or around Sat, 23 Apr 2005 17:54:32 +0100, Dougal
> <DougalAThiskennel.free-online.co.uk> enlightened us thusly:
>
>
>>McBad wrote:
>>
>>
>>>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.
>>
>>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.
>
> '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
> around 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.

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.

 

A

Austin Shackles

Guest

• Apr 23, 2005

• #5

On or around Sat, 23 Apr 2005 20:51:06 +0100, Dougal
<DougalAThiskennel.free-online.co.uk> enlightened us thusly:

>
>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.

--
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

 

D

Dougal

Guest

• Apr 23, 2005

• #6

MVP wrote:

> On Sat, 23 Apr 2005 21:04:29 +0100, Austin Shackles
> <[email protected]> wrote:
>
>
>>On or around Sat, 23 Apr 2005 20:51:06 +0100, Dougal
>><DougalAThiskennel.free-online.co.uk> enlightened us thusly:
>>
>>
>>>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.
>
>
> 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.

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.

 

D

Dougal

Guest

• Apr 23, 2005

• #7

Dougal wrote:
>
> MVP wrote:
>
>> On Sat, 23 Apr 2005 21:04:29 +0100, Austin Shackles
>> <[email protected]> wrote:
>>
>>> On or around Sat, 23 Apr 2005 20:51:06 +0100, Dougal
>>> <DougalAThiskennel.free-online.co.uk> enlightened us thusly:
>>>
>>>> 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.
>>
>> 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.
>
> 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.

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.

 

M

McBad

Guest

• Apr 24, 2005

• #8

"Dougal" <DougalAThiskennel.free-online.co.uk> wrote in message
news:[email protected]...
> Dougal wrote:
> >
> > MVP wrote:
> >
> >> On Sat, 23 Apr 2005 21:04:29 +0100, Austin Shackles
> >> <[email protected]> wrote:
> >>
> >>> On or around Sat, 23 Apr 2005 20:51:06 +0100, Dougal
> >>> <DougalAThiskennel.free-online.co.uk> enlightened us thusly:
> >>>
> >>>> 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.
> >>
> >> 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.
> >
> > 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.
>
> 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.
>

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.