3CX-Project 8 re-fit windscreen wiper.

[Scraperman]

I am about to replace the rear window on my Project 8 3CX. This model has the windscreen wiper motor attached to the window using two holes, one for the wiper blade drive shaft itself and one presumably for stability, all as shown in the attached image which was taken when everything was intact and obviously when the window was closed. My question is does anyone have any idea and/or experience of fitting these into the window ? The new glass has the holes of the correct size in the right place and I shall fit the wiper once I have the window installed.

For obvious reasons I am concerned as to how much torque I should apply to the nuts when I am tightening them up. I certainly don't want to shatter the glass and so if anyone could throw any light on my query I would be very grateful. Thank you.

 

[Mick-the-fitter]

They should have two spacers, 4 rubber washers, and 4 steel washers, the spacers don’t allow you to over tighten but they are tight enough to stop the motor moving around!

 

[Scraperman]

They should have two spacers, 4 rubber washers, and 4 steel washers, the spacers don’t allow you to over tighten but they are tight enough to stop the motor moving around!

Thank you for that. I'll have a closer look for the spacers, only the steel and rubber washers are visible at the moment. Maybe the spacers are tight on the shafts and I just haven't spotted them. Very useful - thank you.

 

[Scraperman]

UPDATE : There aren't any spacers on my wiper motor but there is another anomaly that has appeared. Mine is only a single arm wiper and when I put my serial No. into the web site and look at the wiper on there it is showing a double arm wiper as below.

This is all I have on the main arm of my wiper motor but it seems strange that there are the same number of items, i.e. washers etc.

 

[Monkeybusiness]

I’d imagine someone has just replaced the arm historically.

 

[Shovelhands]

I’d imagine someone has just replaced the arm historically.

I was thinking the same, but I’m not sure the twin arm setup would work with the motor mounted in the position shown in the photo?
Could it be that some models had the motor mounted at the top of the window? I don’t know enough about 3CX’s to be sure.

 

[Mick-the-fitter]

I think you have a flat washer missing, but this is how it is! If the motor shafts are loose in the screen make some steel tube spacers the same thickness as the glass.

 

[Scraperman]

I’d imagine someone has just replaced the arm historically.

Not sure about that. This one has a single arm wiper as well. It had what looked like a personalised registration but I think it is a similar aged machine to mine.

 

[Shovelhands]

Older ones appear to have the top mounted wiper like your parts diagram.

 

[Scraperman]

I think you have a flat washer missing, but this is how it is! If the motor shafts are loose in the screen make some steel tube spacers the same thickness as the glass.

Yes, I have subsequently thought that I will mic the thickness of the glass and see what I have got about. If I had a small lathe I could turn something that could be made to fit. But the problem still arises insofar as to what length you would make the spacer because while it would be necessary to be able to tighten it all up sufficiently to stop the motor from shuffling about I am sure that too much tension would surely shatter the glass ?

 

[Scraperman]

Older ones appear to have the top mounted wiper like your parts diagram.

The one that is shown as being top mounted in my diagram is the front wiper. It is the bottom part of the diagram that is the rear wiper. That is what my machine is like. And that is what they are called in the parts list. https://parts.jcb.com/parts/index/part/specification-data/eyJzZXJpYWxfbm8iOiI0MTIxNjgiLCJzcGVjaWZpY2F0aW9uX2lkIjoiNjVjYzA0ZTUtNWM0Mi00MGRiLTg1YjQtNjlkZTY0NjJkMjQwIiwicGFnZV9pZCI6Ijc2NjkyNTIyLTY5MjktNDBiNy05M2JhLTEzMzZlNzRkYzc5ZCIsInBhZ2VfbmFtZSI6Ik1PVE9SLCBXSVBFUiIsIm1vZGVsX25hbWUiOiIzQ1ggU0lURU1BU1RFUiBUVVJCTyAzMEtQSCIsInNlY3Rpb25fbmFtZSI6IkMwMyBFTEVDVFJJQ1MsIENBQiIsInNlY3Rpb25faWQiOiJjZmFmNDVhNy1lNDdhLTQ3NmUtYjczZC1mNDczNWI4ZTkwOWYiLCJ0cmVlX25vZGUiOiJmOTdmYjIxNS0zOWRlLTQzYjEtYWY5Ny0wN2QzN2EyYjAxNTMifQ,,/

Apologies for the lengthy link above. It was O.K. until I edited my post but it still works.

 

[Shovelhands]

The one that is shown as being top mounted in my diagram is the front wiper. It is the bottom part of the diagram that is the rear wiper. That is what my machine is like. And that is what they are called in the parts list. https://parts.jcb.com/parts/index/part/specification-data/eyJzZXJpYWxfbm8iOiI0MTIxNjgiLCJzcGVjaWZpY2F0aW9uX2lkIjoiNjVjYzA0ZTUtNWM0Mi00MGRiLTg1YjQtNjlkZTY0NjJkMjQwIiwicGFnZV9pZCI6Ijc2NjkyNTIyLTY5MjktNDBiNy05M2JhLTEzMzZlNzRkYzc5ZCIsInBhZ2VfbmFtZSI6Ik1PVE9SLCBXSVBFUiIsIm1vZGVsX25hbWUiOiIzQ1ggU0lURU1BU1RFUiBUVVJCTyAzMEtQSCIsInNlY3Rpb25fbmFtZSI6IkMwMyBFTEVDVFJJQ1MsIENBQiIsInNlY3Rpb25faWQiOiJjZmFmNDVhNy1lNDdhLTQ3NmUtYjczZC1mNDczNWI4ZTkwOWYiLCJ0cmVlX25vZGUiOiJmOTdmYjIxNS0zOWRlLTQzYjEtYWY5Ny0wN2QzN2EyYjAxNTMifQ,,/

Apologies for the lengthy link above. It was O.K. until I edited my post but it still works.

But that link, like the pic you’ve posted of the parts diagram, is for a top mounted rear wiper, yours is side mounted?

 

[Mick-the-fitter]

Probably made for either option on this 4CX

 

[Scraperman]

But that link, like the pic you’ve posted of the parts diagram, is for a top mounted rear wiper, yours is side mounted?

Mmmm. Sorry, my apologies, It looks as if you are correct. I had put my machine serial No. in and that's what it came up with and there are no other options.

 

[Shovelhands]

Mmmm. Sorry, my apologies, It looks as if you are correct. I had put my machine serial No. in and that's what it came up with and there are no other options.

Is your machine very close to the beginning or the end of a serial number run?

 

[GazCro]

Having looked at your wiper motor is it just a single arm motor, the short second bolt will likely just be to stop the motor twisting on the window. If it were for a two arm wiper it would be the same length as the motor spindle (actually a second spindle but turns freely rather than fixed to motor).
If your looking at jcb parts online don't take it as gospel. If you've ever been in dealer and had a good parts man there's often multiple options and many superceded parts to filter through and serial number may only be the first clue needed. There's no way online can be 100% accurate with everything.

 

[Scraperman]

Is your machine very close to the beginning or the end of a serial number run?

Sorry but I don't know the answer to that but I'll have a Google at it and see if I can find the run of Serial Nos. I think it is near to the beginning of the number run.

 

[Scraperman]

Having looked at your wiper motor is it just a single arm motor, the short second bolt will likely just be to stop the motor twisting on the window. If it were for a two arm wiper it would be the same length as the motor spindle (actually a second spindle but turns freely rather than fixed to motor).
If your looking at jcb parts online don't take it as gospel. If you've ever been in dealer and had a good parts man there's often multiple options and many superceded parts to filter through and serial number may only be the first clue needed. There's no way online can be 100% accurate with everything.

Yes, it is just a single arm rotor and the shorter, second stud coming out of the motor is just, as you say, to stop the motor twisting in the window. I have a suspicion that my machine is early in the run and that they were only fitted with single arm wipers. I have seen other slightly newer P8 machines with the two arm parallel wiper set up.
Interesting to read your opinion on the JCB parts online portal. I was also reaching the same conclusion !

 

[Gecko]

Sorry but I don't know the answer to that but I'll have a Google at it and see if I can find the run of Serial Nos. I think it is near to the beginning of the number run.

The P8 serial range runs from: 400001 to 460000.

The parts list I have runs from 430000 to 460000, so there must have been some significant changes mid series.

 

[GazCro]

Yes, it is just a single arm rotor and the shorter, second stud coming out of the motor is just, as you say, to stop the motor twisting in the window. I have a suspicion that my machine is early in the run and that they were only fitted with single arm wipers. I have seen other slightly newer P8 machines with the two arm parallel wiper set up.
Interesting to read your opinion on the JCB parts online portal. I was also reaching the same conclusion !

There's no way the online parts can include the extra knowledge of a decent dealer parts man (they are rare but do exist). There's every chance if you were to stood at parts desk even with serial number you'd be asked if wiper was top or side mounted.