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Mf 10 Starter Problems


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#1 crokit OFFLINE  

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Posted July 14, 2013 - 05:57 AM

Recently on my rebuild project, I purchased a starter for my MF 10.  Worked fine until a couple of days ago.. Started getting that loud clunk when turning the ignition key, several times before it would turn over.  Now a grinding, squealing whine, etc.  However, if i bang the starter several times lightly with a hammer, it starts. 

 

   Anyone have any ideas what's going on?.  Only had this starter for a couple of months. Hate to keep shelling out 60$ every couple of months.      Thanks in advance for any help.  

 

Terry



#2 JDBrian OFFLINE  

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Posted July 14, 2013 - 06:50 AM

Does it seem to be mechanical binding of the gear or does it seem like an electrical problem. As a first step I would put a volt meter between the motor terminal and the chassis and measure the voltage when cranking. If it's dropping much below 12volts you could have a bad connection or a bad solenoid. If it's seems a bit high ( close to the unloaded battery voltage)  the starter is not drawing current which means it's an internal problem. This assumes you have good connections from the chassis of the motor back to the battery - terminal. 


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#3 Amigatec OFFLINE  

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Posted July 14, 2013 - 06:56 AM

Sounds like a bad starter to me. It acts like it has a short in the armature.

Was this a rebuilt starter or a new one?

Edited by Amigatec, July 14, 2013 - 06:57 AM.

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#4 Kyocum OFFLINE  

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Posted July 14, 2013 - 07:31 AM

If that is a gear drive starter I would highly recommend not banging on it with a hammer. The housing on them is very thin and banging on the starter will break the magnets on the inside. Don't ask me how I know that particular piece of info. BTDT In the process of waiting for a new starter I got creative and used 2 part epoxy and glued the magnet back in and it worked. I was rather amazed that it turned the motor over even. Maybe your bendix gear is binding up.


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#5 olcowhand OFFLINE  

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Posted July 14, 2013 - 08:47 AM

I'm betting either broken magnets, bad brushes, or both.  Tapping on them will get worn brushes to contact just enough to get them to turn a bit.  


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#6 MH81 ONLINE  

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Posted July 14, 2013 - 10:07 AM

I was thinking brushes and junk in between the contacts and also bushings.

Bad enough wear in the bushings will allow the armature to bind, maybe even touch the magnets, not much clearance on some of them.
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#7 JDBrian OFFLINE  

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Posted July 14, 2013 - 05:10 PM

Was that a used starter or a new/ rebuilt one. I assumed it was a new one. I'd pull it off the engine and take the end cap off to inspect the commutator/brushes. 


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#8 crokit OFFLINE  

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Posted July 14, 2013 - 06:32 PM

It is a rebuilt new. After checking w/volt meter,  I think I'll take the advice and pull it, take the end off and inspect.  What exactly should I be looking for??  Years ago when I was a kid, I " fixed " a starter on my '70 340 Duster by simply replacing the Bendix.  Can this be done with this type of starter and if so, any ideas where to get a Bendix for it.   Thanks in advance for any help!!   Terry


Edited by crokit, July 14, 2013 - 06:34 PM.


#9 MH81 ONLINE  

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Posted July 15, 2013 - 06:49 AM

I think what you will find is a sticking brush, a bunch of stuff in the contacts on the armeture, or bushings that aren't doing their job.
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