20 replies to this topic

[lctriples]

Just wondering if anyone has replaced plastic cog in Lc/LJ wiper motor. MIne had stripped (plastic spline flogged out) which stopped wipers from working. I managed to source another one but thread on end of metal shaft has broken off. I am worried that punching good cog off broken shaft might break it, as it is old and brittle which is what happened to flogged out cog, when i removed from good shaft. Welding a small piece of threaded rod onto broken shaft might melt good cog. Any advice or help greatly appreciated: Paul

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[S pack]

Only sugesstion I can make is drill and tap a thread into the broken end of the shaft with the good cog, then using a suitable length bolt locktite and tighten it into the newly cut thread in the shaft then cut the head off and clean up so the nut will screw on easily.

[S pack]

You could also cross drill the shaft through the bolt and install a roll pin to ensure the new thread will never unscrew from the shaft.

[lctriples]

Thanks dave, do you think cog will break if i try and remove from broken shaft? If i cant come up with any other ideas, i will use your suggestion and let you know how i went. Regards Paul

[yel327]

Are these Preslite motors like a Holden or Statesman? If so you might be able to buy the parts new. Boss and Steel-line roller door operators have a Preslite looking motor on them. They are 24V but the parts may be the same. See here:

https://www.preslite...ducts-list.html


Also here:
https://abouttimespa...-stock-(genuine)-Probably-early-Holden-/-Falcon-55mm-o/d-8cm-long

Edited by yel327, 15 January 2023 - 08:04 PM.

[lctriples]

Hey YEL327, they are a Lucas unit, but i might give them a ring in the morning to see if they sell spare parts for their units which might fit mine. Thanks for the heads up, i appreciate it: paul

[S pack]

Thanks dave, do you think cog will break if i try and remove from broken shaft? If i cant come up with any other ideas, i will use your suggestion and let you know how i went. Regards Paul

I believe you will be tempting fate if you remove the plastic cog.

[lctriples]

I totally agree, will stick with plan A

[lctriples]

Hey Dave, went with plan A (your suggestion) and worked great. Not sure how long will last but rarely drive car in rain anyway, and if replacement cog strips, might weld a small semi circle lug either side of main shaft, then file same shape out of cog to stop rotating on metal shaft.  

YEL 327, tried to contact both places in your links without success, they may no longer be in business? Was worth a try anyway,

Paul

[S pack]

Hey Dave, went with plan A (your suggestion) and worked great. Not sure how long will last but rarely drive car in rain anyway, and if replacement cog strips, might weld a small semi circle lug either side of main shaft, then file same shape out of cog to stop rotating on metal shaft.  

YEL 327, tried to contact both places in your links without success, they may no longer be in business? Was worth a try anyway,

Paul

Cool Paul, knew the repair would work and if you put locktite on the thread it will last many years to come.
 

[lctriples]

Yes locktite and roller pin

[UCgazman]

Someone needs to CAD those gears and 3d print them...

[lctriples]

Yes, i was thinking the same thing, not sure what other vehicle make and models these motors were fitted too, but there would be a market for them i think!

Edited by lctriples, 18 January 2023 - 10:55 PM.

[sibhs]

If I had a good one to copy I could make a mould and resin pour them. Tricky bit is making sure they have the strength, don't want teeth snapping off at the first sign of use.

 

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Marty

[IanC]

Not saying do this. But if all else fails.. starts about a minute in. https://youtu.be/eP3xJIJ-TbU

Edited by IanC, 20 January 2023 - 04:48 AM.

[lctriples]

Ian: Very similar to "Rapid Fix" product/concept i reckon.

Marty: I have the broken cog you can use to experiment if you want. It is intact except for centre spline which has worn away. I was thinking more along the lines of 3D CAD printing where you could scan cog into PC and use really hard plastic through the 3D printer. How hard a plastic can you mould with?. Would be great to offer to forum members like you did with heater control lettering you sent to me.

Paul

[sibhs]

Ian: Very similar to "Rapid Fix" product/concept i reckon.

Marty: I have the broken cog you can use to experiment if you want. It is intact except for centre spline which has worn away. I was thinking more along the lines of 3D CAD printing where you could scan cog into PC and use really hard plastic through the 3D printer. How hard a plastic can you mould with?. Would be great to offer to forum members like you did with heater control lettering you sent to me.

Paul

Hi Paul, If you want to sent me the cog and centre spline I can start experimenting.

 

Marty

[VDO]

I've successfully punched out the steel shaft by sitting it upside down on a vice adjusted up close to the shaft for rigity, and punch it through.

 

To put the new shaft in, place the gear flat on a bench, a light smear of adhesive on the splines and tap the shaft down gently (it goes in pretty easily).  Remember to screw a couple of nuts onto the thread so you're hitting the nuts, not the thread.  Tap it through to where you want it.

 

I've done this several times.

[lctriples]

Hey Chris, thanks for that. good to know down the track, what type of adhesive did you use? Thanks Paul

[VDO]

Hey Chris, thanks for that. good to know down the track, what type of adhesive did you use? Thanks Paul

Just a very small amount of epoxy is adequate.

[lctriples]

Thanks Chris