Replace / Re-assembly of Window Motor help needed!

[Juddder]

The Drivers window had given up moving but I could hear the motor clicking on pressing the window buttons, so thought it might be good to grease / WD40 the parts to ease it up.

Removed screws holding the two parts together, sprayed WD40 into the gearing however on testing without doing up the bolts holding both parts together, the motor managed to unscrew itself from the gearing mechanism that it drives

It doesn't seem to be an easy part to re-assemble as my attempts of wiggling the two together bluntly refuse to slot into place.

Anyone managed to put theirs back together?

It also seems to be a TVR specific part - WM-M0892 - and I can't see anyone recommending a replacement

Help much appreciated!!

Cerbera window motor refusing to slot back together



The two parts separately

[Jhonno]

It does go.. Can't remember how I managed it though.. Sorry.

[Juddder]

Jhonno said:

It does go.. Can't remember how I managed it though.. Sorry.

Thanks - good to know

My current strategies to attempt tonight are:

a. Put the two screws that hold the unit together in and evenly tighten them until it pressures the unit back together

b. Wire up a 12V battery to the unit and apply power in the direction that will 'drill' the motor part into the gearing

Better / alternative thoughts very welcome!

[pmessling]

Your pressure method won't work because it's a worn gear. You may be able to power it in. But really you need to place the gears together as to not force or strip them.

[Juddder]

pmessling said:

Your pressure method won't work because it's a worm gear. You may be able to power it in. But really you need to place the gears together as to not force or strip them.

Thanks - good to know about the pressure method not working.

I had looked at removing the gearing back plate, to allow the worm and motor to be aligned first and then the gear cog put back into place, but that seems to be pressure sealed in 4 places (no screws or bolts) which didn't look they would easily come apart.

However it does look like they can be rebuilt from a few earlier posts - here

[Juddder]

I tried using battery power to screw the worm motor head back into the cog housing, but there's no way that's going to easily happen (tried a few times, but feels like it will strip the plastic cog inside before it gives)

So... I think the only way to fix this is going to be to remove the back plate from the cog box, and take out the cog to get everything re-aligned

Has anyone any suggestions / experience of how to remove the back plate in the pictures below?

It looks like it has 4 metal 'posts' in each corner which I'm guessing were pressured together like rivets to hold the plate in place.

Can these be drilled out and then replace bolts or similar?

Thanks guys in advance for any advice as I'm pretty much out of my depth with this one now!!



Close up

[Juddder]

Answering my own questions (always the first sign of madness!) it appears that these rivets have to be drilled out and then can be replaced with screws once the internals have been cleaned.

Luckily I stumbled across these very detailed guide on doing exactly the same for Mercedes W123 window regulator motors, and includes pictures of drilling out the rivets, instructions for cleaning and replacement with screws to close up again

Repairing Mercedes W123 Window Regulator "Drill Open" Style

Before



After

[Jhonno]

Did you ever get yours back together again? Just got mine to re-engage again. It is the earlier type motor/gearbox.

[Juddder]

Jhonno said:

Did you ever get yours back together again? Just got mine to re-engage again. It is the earlier type motor/gearbox.

Thanks for asking and not yet - it's on my list of jobs for this weekend!

How easy was yours to re-engage BTW?

I tried an average amount of pressure on mine and tried locking the worm gear cog with grips while trying to screw back in the motor spindle, but still it wasn't easily slotting back together unluckily...

[Jhonno]

Very easy.. No need to undo the casing.

I just lined the rotor/worm up and rotated it clockwise (iirc), after a short time it just picked up and wound back in. I had also tried winding the output shaft that would usually turn the window track with an 8mm spanner, although not sure that was part of it.

I just need to find all the bits and reassemble it and see if my windowmotorectomy has succeeded.

[N1CERB]

Looks very much like a Landrover Disco sunroof motor? I have rebuilt both of mine in the past and have a guise on how I did it on a LR forum if you're keen? I will see if I can find it now...

[N1CERB]

Maybe of some use to someone...

http://www.landyzone.co.uk/lz/f8/how-strip-rebuild...

[Juddder]

N1CERB said:

Maybe of some use to someone...

http://www.landyzone.co.uk/lz/f8/how-strip-rebuild...

Forgot to say thanks for the above - and they do indeed look similar

One thing if I remember correctly is that the Cerbera / Tuscan ones are back to front that those used on the Chimera / Grifith (Drivers = Passengers etc.) so the landrover one looks good for the Passenger side potentially on a Cerbera as the drive cog is facing up when the motor cog is facing east

i.e.

Land Rover Discovery Roof Motor
__
| |
|_|____
|      |
|   +  |
-------

Where as the Cerbera driver on is drive cog facing up when the motor cog is facing west
      __
     | |
-----|_|
|      |
|   +  |
-------

[edit] pictures are easier

Cerbera drivers window motor



Land Rover Discovery sun roof motor

Edited by Juddder on Tuesday 20th October 17:26

Edited by Juddder on Tuesday 20th October 17:36