Do i need new starter armature ?

[NICAT]

Hi.
I had difficulty starting the engine when the engine was hot.
When the engine is cold, Everything is fine.
We have removed the starter to inspect it.
I thought that replacing the starter motor brushed would fix the problem. But Armature is not in a good condition.
The issue is that, Armature is not available for sale in my country. i can only order it from Russia.
I see some wear in it. But seemingly brushes may compensate for the wear.
Can you please tell me, if new brushes can help or i have to replace the armature also?
Regards.

 

[vw7674]

Brushes are 'perishable items' & usually one gets too short & you have a dead spot, engine hot OR cold.
Chances are you have a solenoid going out, they like to fail-to-crank when the engine is warm.
See if you can locate a solenoid. Or lube your current one & recheck hot start performance,

 

[NICAT]

Originally Posted by vw7674
Brushes are 'perishable items' & usually one gets too short & you have a dead spot, engine hot OR cold.
Chances are you have a solenoid going out, they like to fail-to-crank when the engine is warm.
See if you can locate a solenoid. Or lube your current one & recheck hot start performance,


Thanks for explanation.
When it fails to crank, it feels like as if the battery level is very low. So it cranks very and very slowly at the beginning, then it starts the engine.

 

[atikovi]

Originally Posted by NICAT
Can you please tell me, if new brushes can help or i have to replace the armature also?


I don't think anybody in this country would bother replacing either and just get a new starter. Cost of labor to replace those would be more than the cost of a new starter, even if you could actually find a shop that can do that kind of work.

 

[Trav]

You may have bad windings also, you can test the field windings with a VOM and the armature with a growler. A motor shop can help with this and turning or replacing the commutator.
I would probably get a good used one if getting a new one is a problem.

 

[double vanos]

What kind of car is this on? Back in the day of cars you could set the timing on, if the timing was too far advanced the engine would start ok cold but when hot the starter would struggle. Also, what kind of condition are your battery cables in? Unseen corrosion can lead to a cable that will start a cold car but can't pass enough amperage to crank a hot engine.

 

[Eddie]

Some auto shops can test a starter for you and a great shop can test the armature and field winding's. Call around. Ed

 

[irad]

Clean the commutator. The oxidation is driving the resistance up. That is why it cranks very slow, like the battery is low.

 

[Dinoburner]

Originally Posted by Trav
You may have bad windings also, you can test the field windings with a VOM and the armature with a growler. A motor shop can help with this and turning or replacing the commutator.
I would probably get a good used one if getting a new one is a problem.

Agree

 

[mk378]

Batteries can develop a bad connection inside so they become intermittently weak or dead. With any "cranks slow" situation always start with the battery and starter voltage while cranking. @double vanos has a good point that advanced timing makes the burning fuel push back against the starter causing hard starting.

That armature looks quite serviceable. I really doubt the problem is the starter itself.

 

[Andy636]

Clean up the commutator with some 1000 grit sandpaper and then in between the commutator blades with a toothbrush and some alcohol. You seem to have a lot of the brush material all over the place, and that thing is as conductive as it gets...

 

[NICAT]

Thanks All for informative replies