Let's brainstorm.

Turbo Ghost · 03-06-2011, 11:29 AM

When you tried the heat/duster trick, you needed to cool the shaft not the gear. The gear needs to be hotter than the shaft so it's bigger. You might also try (if there is room) heating it then striking it with a hammer back towards the motor to shock it loose. You could also take a dremel and cut a slice down one side then split it with a chisel and hammer. Good luck!

Triple · 03-06-2011, 08:12 PM

Quote:

Originally Posted by askmrjesus

If you can't fit a puller in there, grind the arms down until they fit.

Others have tried this, and the puller generally bends/breaks before the cog moves. This is a fairly common problem with these cars; it's the result of a botched crank-nose repair. Liquid metal used to fill a worn key-way bonds the cog to the crank if it's installed before everything cures.

Quote:

Originally Posted by 101lifts2

I cannot really see from the picture, but are there 4 threaded holes in that sprocket?

I believe older Miatas had threaded holes in their crank gears for this very purpose. Mine does not. I only found one hole and it wasn't threaded; I think someone else may have drilled it in an attempt similar to mine.

Quote:

Originally Posted by Turbo Ghost

When you tried the heat/duster trick, you needed to cool the shaft not the gear. The gear needs to be hotter than the shaft so it's bigger. You might also try (if there is room) heating it then striking it with a hammer back towards the motor to shock it loose. You could also take a dremel and cut a slice down one side then split it with a chisel and hammer. Good luck!

I tried most of what you posted.

I ordered a 4-inch angle grinder with some cutting wheels. Here's hoping I don't damage the crank in the process of cutting the gear...

Turbo Ghost · 03-06-2011, 09:55 PM

Had I been awake longer when I read your post, I would have retained the facts you had already mentioned instead of repeating them!
As for heat, propane is a no go usually. You really need oxy/acetylene to be able to heat the gear very quickly while not heating the shaft it's on. I had the same problem with a radius arm nut on my bronco. Not even a 3/4" impact would budge it. I torched it with my mapp torch and got it nice and orange but, it wouldn't budge with the impact while hot! Hit it with the oxy/acy and it came right off!
Do you know anyone with a plasma cutter? You could cut half of it off while leaving just enought to protect the shaft yet, thin enough to break loose.
If you use the grinder, I would recommend putting something like a sleeve or nut or even duct tape wrapped thickly around the protruding part of the shaft to protect it in the event you slip and hit it.
Be careful, wear eye protection and good luck!

03-06-2011, 11:29 AM	#1
Turbo Ghost Movie Star Join Date: Feb 2011 Location: Kingsport, TN. Moto: KLR650 Posts: 682	When you tried the heat/duster trick, you needed to cool the shaft not the gear. The gear needs to be hotter than the shaft so it's bigger. You might also try (if there is room) heating it then striking it with a hammer back towards the motor to shock it loose. You could also take a dremel and cut a slice down one side then split it with a chisel and hammer. Good luck!

03-06-2011, 09:55 PM	#3
Turbo Ghost Movie Star Join Date: Feb 2011 Location: Kingsport, TN. Moto: KLR650 Posts: 682	Had I been awake longer when I read your post, I would have retained the facts you had already mentioned instead of repeating them! As for heat, propane is a no go usually. You really need oxy/acetylene to be able to heat the gear very quickly while not heating the shaft it's on. I had the same problem with a radius arm nut on my bronco. Not even a 3/4" impact would budge it. I torched it with my mapp torch and got it nice and orange but, it wouldn't budge with the impact while hot! Hit it with the oxy/acy and it came right off! Do you know anyone with a plasma cutter? You could cut half of it off while leaving just enought to protect the shaft yet, thin enough to break loose. If you use the grinder, I would recommend putting something like a sleeve or nut or even duct tape wrapped thickly around the protruding part of the shaft to protect it in the event you slip and hit it. Be careful, wear eye protection and good luck!