Ted

[fendmat]

Hi i have a A4-212 perkins in a 50A backhoe just wondering if anyone knows direction of front crankshaft pulley nut, will have to use a chisel to try and undo as previous owners have butchered the nut and dont know if its l/h or r/h cheers Ted

 

[banjodunn]

G'day Ted pretty sure they are a right hand thread

Jon

 

[fendmat]

G'day Ted pretty sure they are a right hand thread

Jon

Hi Jon thanks for that ,i was laying into it with cold chisel but it wont budge may have to use some heat kind regards Ted

 

[Xfaxman]

If you can see any of the threads on the crankshaft, you can tell if it is right or left.

Did you apply any penetrating oil?

 

[fendmat]

If you can see any of the threads on the crankshaft, you can tell if it is right or left.

Did you apply any penetrating oil?

Hi Xfaxman yes used heaps of loctite freeze and release and cant see any of the thread so i think the only way out of this is to use heat as the nut end is absolutely butchered Cheers Ted

 

[Xfaxman]

It might be pipe wrench time.

 

[MossRoad]

What size is the nut? Depending on its size, you may be better off using a nut breaking tool VS pounding on it with a chisel.

nut buster tool - Google Search

They come in various sizes and work really, really well at not damaging the threads.

 

[fendmat]

Hi Moss Road its a bolt inside the pulley ,very hard to get anything in there

 

[Jw5875]

Hi Moss Road its a bolt inside the pulley ,very hard to get anything in there View attachment 536838

Do you have enough room to possibly place a nut and weld it onto the bolt head (weld inside of nut). Welding a new "head" plus the heat may break it loose.

JW5875

 

[Xfaxman]

Weld a large nut to the bolt head.

 

[fendmat]

Hi JW587 yes that was one of my thoughts to get it out then i would put back in and grind it off because theres a square plate that goes on to run the front hyd pump and not sure how long the bolt is,not a lot of room there ,but thanks for that

 

[MossRoad]

Hi Moss Road its a bolt inside the pulley ,very hard to get anything in there View attachment 536838

So its a bolt, not a nut. Looks like plenty of room to work on in there, too.... haha.

You could try some bolt extractors like these....
Shop IRWIN BOLT-GRIP 5-Pack Bolt Extractor Set at Lowes.com

They work pretty well on rounded bolt heads, but there's always the chance you snap the head off no matter what you do. Then you're going to have to weld a nut onto the broken bolt and back it out while its still hot from the weld.

As others have mentioned, you could try and weld on a nut on top of the rounded bolt head, then back it out. Be sure and clean out that area first to avoid a fire. Then have your wrench handy and try and remove it as soon as possible after the weld. The heat will penetrate the bolt and it should come free. Good luck and let us know how it goes.

 

[Jw5875]

Trick #2 is if you can while the bolt threads are hot from welding, melt birthday candle wax on them.
Don't try to drip the wax, place it against the part thread area and let it melt the wax.

JW5875