61 replies to this topic

[A-Cell]

Try drilling into the broken off piece and screwing a screw extractor into it the left handed spiral should grip your drilled hole easily and as it is not threaded it should come out with a little coaxing.

See #9 post, 36 hours ago....!

[mrducati]

 flywheelpuller2.jpg   34.74K   33 downloads  crankshaft.jpg   56.32K   55 downloads

This is what the pieces look like. The last 7 hours I have attempted to get is loose, but it is crazy-stuck!!! I have now made a slot with an anglegrinder and a dremel with a cutting disc, and tried to lever it to turn anticlockwise in order to release it from the crank. I have broken or bent a few screwdrivers and wrenches in the process.  crankshaft2.jpg   58.08K   50 downloads

 

This:  crankshaft3.png   11.74K   7 downloads

is the approach I had the most faith in because of the leverage it gives. Blue lever is supposed to illustrate a drift, brown is supposed to be a screwdriver. It still won't move even a fraction of a millimeter.

[tsumini]

My understanding of the problem is shown on the attached sketch where the broken piece has been jammed into the crank threads. Top sketch.
Middle sketch shows piece being sheared and jammed into crank... thin section? Picture of puller earlier post shows thicker section.
 Fracture appears to have surface like a casting surface fracture.
I might try the bottom scheme. drill and tap thru the broken piece make thread large as possible without drilling into crank.
Use threaded rod socket and nut as shown to draw the broken piece out.

 

Attached Files

•  tool.jpg   28.56K   57 downloads

[A-Cell]

Excellent idea. Should be effective. Try it with some of the Shock and Unlock spray. Hope it works.

[mrducati]

My understanding of the problem is shown on the attached sketch where the broken piece has been jammed into the crank threads. Top sketch.
Middle sketch shows piece being sheared and jammed into crank... thin section? Picture of puller earlier post shows thicker section.
 Fracture appears to have surface like a casting surface fracture.
I might try the bottom scheme. drill and tap thru the broken piece make thread large as possible without drilling into crank.
Use threaded rod socket and nut as shown to draw the broken piece out.

 

Your understanding of the problem is spot on!. Solution also looks like a good idea. I have bought a 90 degree drill and managed to drill hole in the pice. I'm trying to tap threads in it, but I am challenged for space, so I hope I'll manage to produce good threads. I'll see if I can get it out using your method tonight!

[Carlos W]

If you get the bolt in, you could then weld it in there then twist the broken bit out??

[tsumini]

Good luck... hope it isn't jammed too tight and not acting like a Chinese finger trap.

[The Matt]

Hindsight.....I'd have fitted an old ring spanner over the stuck bit when it was proud of the crank, then lashed a load of weld between the inside of the spanner ring and the sheared off part. Maybe not the neatest of techniques but sometimes brute force and ignorance is called for. Might be handy if anyone else has similar problems?

Any update today?

[mrducati]

Fanally! That little rascal is out! 

 

My understanding of the problem is shown on the attached sketch where the broken piece has been jammed into the crank threads. Top sketch.
Middle sketch shows piece being sheared and jammed into crank... thin section? Picture of puller earlier post shows thicker section.
 Fracture appears to have surface like a casting surface fracture.
I might try the bottom scheme. drill and tap thru the broken piece make thread large as possible without drilling into crank.
Use threaded rod socket and nut as shown to draw the broken piece out.

 

I used your method tsumini. I was even surprised it came out so easily once I had managed to produce treads in the piece. Maybe I had it nearly loose using all that force earlier.

Now next challenge is if I can renovate the treads in the crankshaft! Tap is ordered.

 flywheelpuller3.jpg   33.31K   39 downloads

[tsumini]

Glad to see it came out. Can't tell from the pic. Are there thread marks on the broken piece where it got stuck. I have a pic of 850 crank that shows thread starts much deeper than where it got stuck. Try crank bolt if you haven't already to see if threads are damaged.

Again glad to see it worked.

[The Matt]

Well done matey! Success!

[Guess-Works.com]

I've seen this before, and I've also split one of the trust blocks in two when under load...

 

Which is why, this part of the puller is also being looked...

 

Now the question is... have your ordered the right tap for the crankshaft ????

[Carlos W]

Really glad to see it out!

You've shown the patience of a saint!

[A-Cell]

So glad for you. Do hope crank threads are salvageable

[A-Cell]

I've seen this before, and I've also split one of the trust blocks in two when under load...
 
Which is why, this part of the puller is also being looked...
 
Now the question is... have your ordered the right tap for the crankshaft ????

Maybe the safe way is not to use the thrust block and instead put a crank bolt in loosely. This used to be the method in the very early days, we had an old bolt with the overthrow, pip filed off the head of the bolt. For some of these Verto the loads needed to remove them are enormous. The size of the thrust block is so tiny that in effect it is unable to take the load.