crank to flywheel dowel question

[weszeebee]

So I thought i was ready to put everything back together when i noticed the dowel on the crank is broken and almost flush with the crank, does anybody have any ideas on how to remove the broken dowel?

 

[bastarddsm]

Drill a small 3/16" hole in the center of dowel, pack with grease, then use a 3/16" punch in the whole to push it out, hydraulically.

 

[weszeebee]

What do you mean hydrolically. I'm not sure how that works. I got a dowel from the dealer but the dowel they gave me is a a little smaller then the one in the crank. I was thinking about filing it flush because its only use is to align the flywheel. What do you think? Thanks

 

[yukiz]

Then thats is not the right part. Use the right part, that dowel pin plays crucial in terms of keeping the crankshaft Align and Tight. It should have tight fit. How did you manage to beak the dowel pin? That tiny thing is so strong. I think if i am not mistaken, you can use the dowel pin out of transmission(if you have any that you dont use.)

 

[weszeebee]

The dowel was already broken when I pulled the trans. Not sure if it broke when the. Tranny shit out or if the Guy I bought I bought the car from installed the trans. With it broken. I would think though that all the stress would be on the 7 bolts not the dowel

 

[curt-s]

There is still a small space between the surface of the flywheel bolt threads and the inside of the flywheel holes itself. It's small, but it's there; it's not a tight fit, otherwise you'd almost have to thread the bolts through the flywheel itself (but not really). The alignment dowel helps keep the flywheel from wanting to rotate on it's own, causing shear stress to the bolts. When that breaks, it is possible for the flywheel to rotate independently of the crankshaft, by that previously mentioned tiny space inbetween the bolts and their respective holes in the flywheel. Repeated back and forth and rotation of the flywheel will wear both the mating surface of the crank/flywheel and cause undo stress on the bolts.

I'm sure it does other things too, but that comes to mind logically. Somebody feel free to correct me if I'm wrong.

 

[weszeebee]

ya i would like to play it safe and do it right so i dont have a bigger problem down the road. im still stumped on removing it though and its this one little $3 part that is keeping me from running. previously mentioned i could drill it and punch it out hydraulically? Can anybody explain that to me?
thanks

 

[miguelmcv]

Hydraulically.

If you drill a 3/16 hole in the dowel and pack it with grease or a wet toilet paper, the hole will be filled, if you put a 3/16 punch on it and hammer it in, the punch will force the liquid out of the hole, But because there is no gap for the liquid to come out, it will force the weakest part out, in this case should be the rest of the dowel, so basically, you are doing it Hydraulically because you are using grease/water (liquid).

Hope you understand what I am trying to say.