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Triumph TR6 - Wipers in Reverse

Hi Guys,
My friend Steve has a '74 and we after putting the wipers back in the car discovered that they are run backwards. Everything works and the wiring matches where it should as far as we can tell but when put in the "park" mode they go to the opposite side. We watched my motor in my '75 and it runs clocwise whereas Steve's runs counter-clockwise...
I've got Dan Master's excellent book but that topic is not covered.
Any suggestion would be appreciated

Thanks
Charlie
Charlie Ballard

Charlie,

It doesn't matter which way the motor runs, the wipers will work just the same. If they are parking on the wrong side, you need to move the parking switch cam to the other side. See page 139 of my book for more details on this.

Remove the wiper blades before doing anything, and make sure the wiper splinde are rotating and parking properly before replacing the blades after you've finished.
Dan Masters

Thanks Dan...it's funny I read that about the left / right hand drive and moving the cam but I thought the motor should still run in the same direction.
We'll give that a try...Thanks again
Cheers
Charlie
Charlie Ballard

Charlei

Most DC motors are reversable just by switching the wires. As Dan points out wiper motor doesn't matter really. Good example is power windows. Up and down is just a matter of which way the switch hooks up +-.

Bill
Bill Brayford

Hope this link helps you or someone else working on their wiper motor.

http://www.team.net/www/morgan/tech/art002.html
Tom

Ok...the cam was moved to the opposite side and they still park the wrong way...I'm now thinking the + and - wires are crossed somewhere...Time to run some more tests..I'll keep you posted
Charlie
Charlie Ballard

Charlie,

This is puzzling. It doesn't matter which way the motor rotates, the drive splines coming out of the wheelboxes will still operate the same way. The rotory motion of the motor is converted into linear motion inside the wiper motor/gearbox assembly. If the motor rotates in one direction, the drive cable out of the box will move first to the left, and then to the right. If it rotates the other way, the drive cable will move first to the right, and then to the left.

Either way, the drive splines will move CCW for one cycle, the CW for another, over and over again. If you put the blades on properly, they will also operate CCW for one cycle, and then CW for another. If you put them on wrong, they will tend to drive into the body under the windshield, but they will still alternate between CCW and CW rotation.

Given that the wiper blades move correctly, the only thing left is to determine on which rotation they will park. With the cam gear in one slot, they will park at the end of the CCW rotation; if the cam is in the other position, the wipers will park on the end of the CW rotation.

The wiper motor can be made to operate in the reverse direction, but it shouldn't have anything to do with the park position, nor with the motion of the blades.

Even if you put the wheelboxes in upside down, the splines will still switch back and forth, and if you put the blades on right, they will also operate back and forth. If you only put one on upside down, the blades will operate oppositely - one going CCW while the other goes CW.

As I said, I'm puzzled by this, so please let us know what you find out when you get it fixed. Offhand, I can't think of any miswiring that could cause this, and yet still allow the wipers to park, but I'll look into it more tomorrow.

For those that don't have a copy of my book, more info on wiper motors can be found at

http://www.vtr.org/maintain/wiper-motor/

Dan Masters

Charlie do the wiper blades have a definite stop point or just over other side? Should be within about 1/2 inch on several tries.

Do the 2 speeds work?

Are the fuel and temp gauges reading normal with wipers on any deflection.

Check your voltage at the green input to the switch and the green input to the motor. Are they the same?

The only thing I can think of is the wiper switch feed may be picked up on the regulated side of the stabiliser about 10 volts rather than the input side as it should be. Braking voltage or reverse should always be close to equal.

If theres too much of a voltage difference the motor may be reversing momentarily rather than stopping?

May give an exact stop but I'm not sure never tried that.

My wiper motor is attached to the body carcass in storage so I can't test. Hope Dan can?

Gotta love a puzzle.
Bill





Bill Brayford

Hi Charlie
I had the same problem when I converted to RHD, I turned the cam through 180 and it still parked on the LHD side, at that time I gave up and learned to live with it, but if you find a solution I'll give it another go.
Ron
R. Algie

Check the archives. I seem to recall that there is a posted resolution to this issue. (I just can't remember what it is!)

It might be on another site, but I think it's here, maybe hiding behind a windshield thread.

Charlie
EC Smith

Ron,

Did you just turn the drive gear 180, or did you pull the cam lobe out of it's socket and move it over to the other side?
Dan Masters

Dan
Can't remember, too long ago, will give it another try this winter.
Ron
R. Algie

Hi. I'm Steve. It's my wiper motor.

Dan, to your last point, I pulled the big, plastic gear and moved it around 180 degrees.

The enthusiasm and helpfulness on this site is pretty incredible. Thanks to all of you.

Ron, we'll give you the fix once we suss it out.
Steve

"Dan, to your last point, I pulled the big, plastic gear and moved it around 180 degrees."

Steve,

That won't do it, you have to move the cam lobe over. Look at photo 9 in my book on page 139(I believe Charlie has a copy), and you'll see exactly how to do this. It's a piece of cake! Just pry the cam lobe off and re-insert it in the two holes on the other side.
Dan Masters

Hey all......

Been there-----done that!

The diagram in the TR-6 manual, para.84.15.18.iis in error.[This is the diagram re park position, Rh and LH steer vehicles] The labels should be reversed, ie. illustration "A" should be illustration "B"; "B" changes to "A"

This can be corrected rather simply.......let me know if further is required.

Dale.
Dale

Thanks guys. Will try to get to it this evening and let you know how it goes.
Steve

Dan, I re-located the lobe on the underside of the gear wheel. That change corrected the problem.

Let me give a big thanks to you and Charley for all the help.

Ron Algie, this solution may be for you as well.

THANKS GUYS.
Steve

Gentlemen

I know this is related to this link, but I just purchased my first TR6 and have a few things to work on. Well I have tried for the last several days to connect to the www.vtr.org site (one of my favorites) and it is down. Does anyone know what the story is and when it might be back up?

Again sorry for the stray post, noticed the recent activity.

Mike
Mike Blankenship

Wipers now park on the 'correct' side for a UK car, thanks to Dan Masters and all who contributed.
Ron
R. Algie

This thread was discussed between 20/08/2004 and 25/09/2004

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