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974 posts

Ultimate Geek


#269850 11-Apr-2020 11:49
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The central locking in my old Hilux has been on the fritz for a while now and I've finally had some time to have a proper look at it. Confirmed power was getting to the actuator correctly, so removed the actuator, split it apart and removed the motor and tested it - confirmed the the motor did not always work when 12v was applied, and often if I gave it a little 'help' to get going, then it would kick into life - so seems like the motor is on the way out. Oddly enough, the closest match I could find anywhere to the whole actuator was for a mid 90s Renault Megane. Seems unlikely but I have one of those on the way to see if it will work - the molding for the actuator does have 'Rookwell France' printed on it so who knows. 

 

I also found some DC motors that matched the one that was in there perfectly - so I can get one of those coming, but my main issue will be trying to get the gear off the old motor without damaging it - it's a bit of a weak looking metal & plastic job as you will be able to see from the pictures. If the whole gear was metal, I'd heat it up and pop a couple of small screwdrivers in there (as I wouldn't be worried about damaging the motor) and I imagine it would just pop off, but with the plastic gear, heating it up isn't really an option. 

 

I don't have any small gear pullers - I could possibly make something, but even then getting something thin enough and strong enough in the gap between the motor and the gear is going to be very difficult, as I'd need to have a slightly raised bit so it wasn't pulling on the plastic part of the gear. Would be doable but pretty fiddly. 

 

Does anyone have any ideas on the best course of action here? Thinking there might be some people into RC/hobbyist sort of stuff that might have some experience with this sort of thing. Thanks!

 

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902 posts

Ultimate Geek

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  #2459325 11-Apr-2020 12:16
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I personally don't think you'd succeed with pulling it. If you have a good drill press with low run-out, I'd suggest drilling it out. Pressing it onto another motor would be easy with the brass bush. If I was going to attempt to pull it I'd do it by wrapping fabric round the shaft and try and spread the force across the whole gear.

 

Edit: You pull the fabric. Like the trick for removing knobs from amplifiers.








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  #2459332 11-Apr-2020 12:39
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If you have a piece of plate steel or something like a bit of inch (or there abouts) right angle aluminium extrusion, cut a slot big enough to slide the motor shaft into. The piece of plate needs to be thin enough to slide between the motor and the gear.

 

Anchor the piece of plate in a vice or using a G clamp to clamp it to a bench so that the motor can be positioned onto the plate with the gear facing upwards so that the brass insert of the gear is resting on the plate. Use a small drift drive the motor shaft out of brass boss on the gear. 

 

I hope my description is adequate.





Sony Xperia X running Sailfish OS. https://sailfishos.org The true independent open source mobile OS 
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  #2459333 11-Apr-2020 13:01
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I would cut the motor shaft with a dremel style tool, and then place it over a hole in a block and use a punch or even a flattened off nail to drive it out.





Richard rich.ms



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Ultimate Geek


  #2459344 11-Apr-2020 13:40
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Thanks for the suggestions guys. I've got a fair bit of stuff in the garage, but some key pieces of equipment are currently missing - no cutoff discs for grinder, no hacksaw blades, no dremel. 

 

There is also only about 1mm clearance between the base of the gear and the motor so that just makes things fiddly as not much that's strong enough will actually fit in there. 

 

With a bit of thought and some help from the suggestions here I was able to make a sort of bundy press thing from an old LED light bracket that just happened to be the perfect thickness and actually managed to get it off unscathed by tapping the shaft through with a small punch. 

 

I was only able to get this to work by wedging the motor against the top of the vise - the bits of bracket I was using were no where near stiff enough otherwise. There were slight raised bits where I filed a 'V' into the brackets to fit around the shaft so hopefully that was putting most of the force on the brass bit, not on the plastic. Either way I managed to get it off! So I might look at getting one of those motors coming too and have a go with that in case the old Renault part isn't quite right. Thanks very much!

 

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  #2459346 11-Apr-2020 13:51
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Pleased you got it off unscathed. It lives to fight another day. 😄





Sony Xperia X running Sailfish OS. https://sailfishos.org The true independent open source mobile OS 
Samsung Galaxy Tab S3
Nokia N1
Dell Inspiron 14z i5


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