John T starter question

JimKS · Feb 21, 2020

Tractor I am working on there is not a soft plug covering the end of the shaft on the brush holder end. When I use the starter I see sparks coming from between the bushing and the shaft. The starter seem to turn the engine over ok. I pulled the end plate off and do not see any thing rubbing or touching where it should not. what should I look for. This is a Delco 1109229 j.

Jim

gregww · Feb 21, 2020

I think sparks are normal between the brushes and commutator. Someone may correct me though. I would find a way to plug that hole though.

old · Feb 21, 2020

A few sparks are normal but a lot of sparks are not. If your seeing a lot of spark the brush springs could be getting weak or the brushes are getting to short and worn

rustred · Feb 21, 2020

I sure don?t see how there can be sparks on the armature shaft. Plus there would be grease on the bushing. With the brush cover off you will see a small amount of sparks on the commutator that would be on bench testing it.

JimKS · Feb 21, 2020

The end plate is a solid plate. The sparks are definitely coming out the shaft unless they are venting out thru the shaft. I can see some sparks on the brushes not excessive

Jim

John T · Feb 21, 2020

Jim, A big difference is if the sparks are between the brushes and the commutator

or

The armature shaft and the bushing ??????????

Its normal for smaller sparkies from brushes to commutator and the smoother the commutator,,,,,,,,,the better/tighter/stronger the spring tension holds the brushes down,,,,,,,,,,, the better shape the brushes,,,,,,,,,THE LESS SPARKS.

If there's sparks from shaft to bushing I fear the armature has some shorts and that's serious and isn't going to get better and eventually cause high current and heat and possibly fry the armature

grrrrrrrrrrrrrr

John T

gab · Feb 21, 2020

I don't ever remember seeing that brush end plate having an open end or a place where a plug would go. You sure the bushing didn't go out along with a thick fiber washer allowing the shaft to wear through the end plate.

gregww · Feb 21, 2020

Would like to see a pic of the end of this stater.

Janicholson · Feb 21, 2020

With the brushes lifted off the commutator (both of them, using some plastic knife blades, or piece of gallon jug) there should be infinite resistance between the commutator bars and ground, (spin it to assess each bar) no connection. If there is, a shorted commutator will try to ground through a bushing. It may require a new armature. Jim

Steve@Advance · Feb 21, 2020

Look at the brush commutator segments.

If one, or an opposite pair are darker than the others, or has a burned edge, the armature is shorted internally.

John T starter question

JimKS

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gregww

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old

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rustred

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JimKS

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John T

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gab

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gregww

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Janicholson

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