How to remove broken dowel pins (crank to flywheel)

[modok]

I got a great deal on a scat 82 stroke crank with all 8 dowels broken off in it.
The end of it is so mangled i can't see exactly where the pins are(were).
The crank is very hard, the pins are harder.

Two days ago I thought of how to remove the pins.
I tried it today and got all 8 out in 40 minutes.

Now, I'll still have to weld up around the holes and re-cut the back of the crank and use 11/32 pins, BUT, that's doable! Done it several times before.

There are a lot of sharp thinkers around here, so I bet somebody can guess how I did it.
Clue: step one was drill a 3/16 hole through each dowel (carbide end mill)

[Dougy Dee]

Core.
Tap to grab.
Slide hammer on tap.
Out.

I've found some dowels were only hardened on outside. Tapped and threaded a bolt in and out they came.

[modok]

nope. No threads

[67 Sunroof]

Drill 3/16 hole, tap, thread, then use grease to push them out?
Genius...

Oops! No threads.... Hmmmm..

[modok]

YES! or close enough.
Flooded with heavy gear oil and drove with a short piece of 3/16 drill rod.
A few taps with a hammer, add more oil, few more taps, and out!
Just like a little hydraulic jack!

[esde]

brilliant.

[modok]

Thanks. I wasn't sure if it would work, but it DOES!
I think grease would work well too, but I didn't have a needle attachment to squirt the grease into the tiny hole.

safety goggles and heavy gloves are recommended.

[Dan Ruddock]

Is this something that you are interested in offering as a service. I know someone with a messed up scat 78 that might be interested. Four dowels are broke and four are good but I would take all out for butt grinding.

Ok sickos just tring to describe it.

Dan

[modok]

If it's worth the shipping and 60 an hour, I don't see a reason against it.

But.....I betcha if you explain it to Jose he can do it too!

[theKbStockpiler]

[67 Sunroof]

What do I win?? Hahaha!
I'm such a newb.
Someone here had suggested that method when I was having trouble trying to get my clutch shaft out. It worked like a champ. Amazing.

Think it was Glenn?

[modok]

[earthquake]

Any body ever try a pin spotter and a slide hammer?
We had one at the shop where I used to work that worked good, we had to grind them off if they were put in the wrong place.

Casey
_________________
74 CLASS 11 LOOK-A-LIKE
69 DUNE BUGGY
79 INTERNATIONAL SCOUT II
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95 Chevy C3500 dually
98 Ford E150
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DEATH TO CHINGERS!
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[morymob]

[Dougy Dee]

I forgot about the 'grease and dowell' trick. Used it years ago to pop bushing out of V6 or 8 crank we were converting. Worked surprisingly well! Got a little messy but it worked.

[esde]

[modok]

I've never seen a stud welder successfully attach to a large chunk of hardened steel. It could be done somehow, but never seen it.

[VWfinatic273]

Thanks for sharing, this is ingenious!!!! I wouldn't have thought about it but have done similar for other scenarios. I'll put this in the trick bank

[theKbStockpiler]

What about using the trick used on broken head studs of welding a washer on the flush stud through the hole of the washer placed on top of it and then welding a washer faced nut on top of that?
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Use all safety devices including a mask.

[daos]