Removing JB Weld off Cast Aluminum Block

[LEXAR]

I've got myself into a bit of a problem due to my impatience.

I had a coolant leak coming from a block off plate on an aluminum engine block. I proceeded to JB weld around the block off plate to seal it. It didn't work, now I've got JB weld stuck on the engine block.

Is there a safe way to remove the JB weld besides pulling the whole motor and grinding it down?

Engine Block is Cast Aluminum

 

[Dumber than lumber]

I've got myself into a bit of a problem due to my impatience.

I had a coolant leak coming from a block off plate on an aluminum engine block. I proceeded to JB weld around the block off plate to seal it. It didn't work, now I've got JB weld stuck on the engine block.

Is there a safe way to remove the JB weld besides pulling the whole motor and grinding it down?

Engine Block is Cast Aluminum

I think a careful tap-tap-tap with a small flat screwdriver and a hammer will get it off.
some folks on here might say 'angle grinder".

 

[engineer2]

Acetone (extremely flammable!) is a good solvent for epoxy before it sets. Not sure if it will soften dried epoxy, but it's worth a try. I would use a sharp wood chisel being careful not to gouge the aluminum.

https://compare-bear.com/how-to-remove-jb-weld/

 

[sberry]

Wire wheel.

 

[Shiftless]

Dremel tool has lots of attachments. Good for getting into tight spots.

 

[RPH]

Heat, they use two part epoxy for the fluxtrol on the induction coils. These coils survive in a horrible world but the glue hangs in. When in for a rebuild they have to burn the stuff off. So get it hot.

 

[sberry]

Thas a good idea. It's why you make the big bux.

 

[matt_i]

Agree with light chisel work.

But, it is also very easily cut with a file.

 

[tool_scrounge]

Heat + scraping and chiseling works from my experience. An issue is the aluminum will act as a heat sink making it harder to heat up.

 

[ZRX61]

I think a careful tap-tap-tap with a small flat screwdriver and a hammer will get it off.
some folks on here might say 'angle grinder".

Seriously??

 

[Hawke]

I’ve just had to weld up an Aluminium fuel tank that had been fixed at the track with JB weld. Using a screwdriver or chisel will remove some, but not all. Grinding wheels and wire brushes will just tend to push it into the aluminium. I found that a 120 grit flapper disk will get rid of it, along with a bit of the aluminium.

Depends I suppose, why you want to remove it.

 

[John T]

Just use MORE jb weld.

.

.

Yikes.

 

[neophyte]

JB Weld is usually fairly brittle in my experience.
A light hammer and cold chisel would probably chip it off.

 

[CudaChick1968]

Seriously??

Are you sure you need coolant? Time to hard block that sucker.

 

[LEXAR]

Heat + scraping and chiseling works from my experience. An issue is the aluminum will act as a heat sink making it harder to heat up.

I'll try this, I've got a good chisel and a heatgun

I’ve just had to weld up an Aluminium fuel tank that had been fixed at the track with JB weld. Using a screwdriver or chisel will remove some, but not all. Grinding wheels and wire brushes will just tend to push it into the aluminium. I found that a 120 grit flapper disk will get rid of it, along with a bit of the aluminium.

Depends I suppose, why you want to remove it.

I can get a chisel in there, not sure the flap disk will fit though.

Are you sure you need coolant? Time to hard block that sucker.

Not a racecar hahahahaha.

JB Weld is usually fairly brittle in my experience.
A light hammer and cold chisel would probably chip it off.

I sure hope so!

 

[RTM]

https://www.jbweld.com/faqs

HOW CAN I REMOVE J-B WELD AFTER IT IS FULLY CURED?

When fully cured, J-B Weld can only be removed by grinding or filing it off, or by directly heating the product above the 600º maximum temperature threshold.

So apparently, no solvents/