Starter binding up

[PolaraFury]

What would cause my starter to bind up?

When I turn the key it cranks really hard like the timing is off but, it isn’t and when it’s hot it’s even worse

it’s an aftermarket high torque starter (no idea what brand because I can’t find any markings)

 

[BLK 68 R/T]

Week battery, bad cable, tight motor, weak starter. Could be a combination of a few.

 

[66383]

Week battery, bad cable, tight motor, weak starter. Could be a combination of a few.

And how old are all the above mentioned parts?

 

[PolaraFury]

Fresh rebuild only thing left is the original block.

when the starter was on the old build it would hard crank when it was hot

 

[BLK 68 R/T]

Initial thought is the starter is the problem based on what you have said.

 

[PolaraFury]

Starter is Kaput.

 

[BLK 68 R/T]

Starter is Kaput.

Is your positive battery cable in good shape. That could cause an issue as well if it’s not transferring full battery current to the starter. But it most likely is the starter itself.

 

[1967coronet]

Fresh build = tight engine in most cases.
That and a older starter will show up or cables ect like mentioned above.

 

[HALIFAXHOPS]

Hit it with a timing light when you crank it to be sure. I had a really weird one with the Vac advance advancing while cranking, drove me nuts and yes it was on ported vacuum. Actually broke two starter noses off before I found it.