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| Starter motor locking up https://www.ausmini.com/forums/viewtopic.php?f=2&t=83208 |
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| Author: | BBart [ Tue Oct 22, 2013 10:05 am ] |
| Post subject: | Starter motor locking up |
So every now and then my starter motor seems to lock up and won't turn over. I put the car in 3rd and rock the car until it frees up, then she's good to go for the next year or two until it happens again. Do you think this is anything to be worried about, or just accept it as a quirk of the car?  '69 Mini 1100 standard, more or less a Mini K. Thanks in advance! |
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| Author: | Harley [ Tue Oct 22, 2013 10:25 am ] |
| Post subject: | Re: Starter motor locking up |
I'd leave it. If you fix it, something else will go wrong! 
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| Author: | awdmoke [ Tue Oct 22, 2013 11:26 am ] |
| Post subject: | Re: Starter motor locking up |
The ring gear on the flywheel is chewed out in one spot. The engine usually stops in one of 4 places, so the starter only engages in those spots. Disconnect the battery, unbolt the starter motor. Reach in with a small file & file the burrs off the ring gear in those 4 places. You'll be able to see the burrs. Alternatively, fit a gemini starter motor! They use the other (unworn) side of the ring gear, and they don't burr the ring gear either. |
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| Author: | peterb [ Tue Oct 22, 2013 6:58 pm ] |
| Post subject: | Re: Starter motor locking up |
While you've got starter out, check gear end bush (bearing) for looseness, also teeth on gear. It is a mini starter? These starters were used on lots of pommy cars, it may be wrong gear on it. i.e. might be triumph or hillman etc, they all look the same at a glance. I think it should have 9 teeth? |
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| Author: | drmini in aust [ Tue Oct 22, 2013 7:00 pm ] |
| Post subject: | Re: Starter motor locking up |
peterb wrote: While you've got starter out, check gear end bush (bearing) for looseness, also teeth on gear. It is a mini starter? These starters were used on lots of pommy cars, it may be wrong gear on it. I think it should have 9 teeth? Some Mini ones have 9 teeth, others 10, just to confuse us! |
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| Author: | kiwiinwgtn [ Tue Oct 22, 2013 7:07 pm ] |
| Post subject: | Re: Starter motor locking up |
sounds like brushes to me, they wear un even so when you rock them they click back into place. take the starter apart and have a peak. Kiwiinwgtn |
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| Author: | m1100s [ Tue Oct 22, 2013 7:37 pm ] |
| Post subject: | Re: Starter motor locking up |
The only way rocking will help is if the Bendix gear is stuck in mesh with the ring gear. Remove starter and check if gear moves freely on the armature shaft, if sticking clean thoroughly & very lightly oil shaft with the most minimal amount of the thinnest oil available. Refit & all should be O.K. until the next time clutch dust makes a mess of it. Ash. |
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| Author: | Convertible Mini [ Wed Oct 23, 2013 6:25 am ] |
| Post subject: | Re: Starter motor locking up |
Why would the brushes being worn cause the starter drive lock in mesh? |
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| Author: | drmini in aust [ Wed Oct 23, 2013 7:25 am ] |
| Post subject: | Re: Starter motor locking up |
m1100s wrote: The only way rocking will help is if the Bendix gear is stuck in mesh with the ring gear. Remove starter and check if gear moves freely on the armature shaft, if sticking clean thoroughly & very lightly oil shaft with the most minimal amount of the thinnest oil available. Refit & all should be O.K. until the next time clutch dust makes a mess of it. Ash. Use powdered graphite on the bendix splines instead of oil, so the dust won't stick to it. 
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| Author: | BBart [ Wed Oct 23, 2013 9:34 am ] |
| Post subject: | Re: Starter motor locking up |
Thanks for the replies. I'll pull the starter motor off when I get a chance and look into it. Seems it could be caused by a number of things, so better make sure it's nothing too serious. In the meantime she's running fine, but for how long is the question Cheers! |
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| Author: | Wombat [ Wed Oct 23, 2013 5:48 pm ] |
| Post subject: | Re: Starter motor locking up |
drmini in aust wrote: m1100s wrote: The only way rocking will help is if the Bendix gear is stuck in mesh with the ring gear. Remove starter and check if gear moves freely on the armature shaft, if sticking clean thoroughly & very lightly oil shaft with the most minimal amount of the thinnest oil available. Refit & all should be O.K. until the next time clutch dust makes a mess of it. Ash. Use powdered graphite on the bendix splines instead of oil, so the dust won't stick to it. Or wash in kerosine and let air dry and assemble without any extra - kero will be lubricant enough |
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