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Re: '93 240 wiper dilemna
Volvo automobiles Volvo automobiles. (alt.autos.volvo)
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#1
 
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Re: '93 240 wiper dilemna -
10-07-2009
, 02:53 PM
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My '93 240 has wiper problems. The intermitent doesn't work properly and once the wipers are activated, I can't get them to stop unless I turn off the engine. I thought it was the relay and got a new one, but it didn't make any difference at all. I even borrowed one from a '90 240 but to no avail. |
gearbox. Disconnect the battery (!) and take the cover off. There is a
set of (3 ?) copper fingers that are the contact actuating cam
followers. There is one that needs to be bent to give it a little more
clearance so that it cuts the current to park the motor at the right
time. As the cam or wipers wear, or just stress to the copper arms
arms makes them relax over time, they get a little too close together.
Additionally, as the mechanism has less friction from wear, momentum
can carry the arms a bit further causing the contacts to touch again.
__ __
Randy & \ \/ /alerie's
\__/olvos
'90 245 Estate - '93 965 Estate
"Shelby" & "Kate"
#2
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Someone <someone (AT) somewhere (DOT) com> wrote: My '93 240 has wiper problems. The intermitent doesn't work properly and once the wipers are activated, I can't get them to stop unless I turn off the engine. I thought it was the relay and got a new one, but it didn't make any difference at all. I even borrowed one from a '90 240 but to no avail. Mine as well. The problem is with the cam in the wiper motor's gearbox. Disconnect the battery (!) and take the cover off. There is a set of (3 ?) copper fingers that are the contact actuating cam followers. There is one that needs to be bent to give it a little more clearance so that it cuts the current to park the motor at the right time. As the cam or wipers wear, or just stress to the copper arms arms makes them relax over time, they get a little too close together. Additionally, as the mechanism has less friction from wear, momentum can carry the arms a bit further causing the contacts to touch again. |
Currently, they stop wherever they are, soon as I turn them off. Have to
time it just right to catch them at the bottom of the windscreen.
#3
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Someone <someone (AT) somewhere (DOT) com> wrote: My '93 240 has wiper problems. The intermitent doesn't work properly and once the wipers are activated, I can't get them to stop unless I turn off the engine. I thought it was the relay and got a new one, but it didn't make any difference at all. I even borrowed one from a '90 240 but to no avail. Mine as well. The problem is with the cam in the wiper motor's gearbox. Disconnect the battery (!) and take the cover off. There is a set of (3 ?) copper fingers that are the contact actuating cam followers. There is one that needs to be bent to give it a little more clearance so that it cuts the current to park the motor at the right time. As the cam or wipers wear, or just stress to the copper arms arms makes them relax over time, they get a little too close together. Additionally, as the mechanism has less friction from wear, momentum can carry the arms a bit further causing the contacts to touch again. __ __ Randy & \ \/ /alerie's \__/olvos '90 245 Estate - '93 965 Estate "Shelby" & "Kate" |
You don't need to disconnect the battery, unplugging the connector from
the wiper motor will remove power to it. Agreed that this is likely the
problem. I keep a spare wiper motor around (junkyard pull that I tested)
since it's one of those things you're stuck without if it's raining.
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