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-   -   Dowel Pin Stuck (http://www.advrider.com/forums/showthread.php?t=854838)

indr 01-11-2013 10:22 AM

Dowel Pin Stuck
 
The picture is of the bottom of the upper half of the crankcase.

(bottom half of the picture)
http://i.imgur.com/IdTN3.jpg

The dowel hooks onto the bearing on the driveshaft to prevent spinnage of the outer race of the bearing.

The dowel is supposed to be sticking out but it is some how lodged and flush with the case with no where to grab onto.

How to take out?

Twilight Error 01-11-2013 10:49 AM

If the pin is tight enough to not spin, try running a tap in there to grab it.

twinjet 01-11-2013 10:56 AM

Quote:

Originally Posted by indr (Post 20456208)
The picture is of the bottom of the upper half of the crankcase.


(bottom half of the picture)
http://i.imgur.com/IdTN3.jpg

The dowel hooks onto the bearing on the driveshaft to prevent spinnage of the outer race of the bearing.

The dowel is supposed to be sticking out but it is some how lodged and flush with the case with no where to grab onto.

How to take out?

If the dowel is hollow all its length, find a solid dowel that will just slip into the stuck hollow dowel, fill the cavity with oil then tap the solid dowel into the hollow dowel. Hydraulic pressure will force the hollow dowel out. (wear safety goggles).
If the stuck dowel is solid, drill a smaller diameter hole from the other side and use a suitably sized drift pin to drive the dowel out from above.

indr 01-11-2013 11:59 AM

The dowel is hollow all the way down. Where it sets in the crankcase, there is an oil passage drilled into the crankcase itself; i.e. there's no way to build up pressure.. So, using hydraulic pressure won't work.

Drilling a hole from the other side would mean drilling through the crankcase.

WRW9751 01-11-2013 12:01 PM

Snap and Mac make inside/outside pliers. A little heat and a pair of those pliers might just do the trick.

mouthfulloflake 01-11-2013 12:08 PM

drive a self tapping screw into it, and then use a slide hammer to pull the screw out, hopefully with the dowel pin on it.

bomber60015 01-11-2013 12:09 PM

Quote:

Originally Posted by indr (Post 20457212)
The dowel is hollow all the way down. Where it sets in the crankcase, there is an oil passage drilled into the crankcase itself; i.e. there's no way to build up pressure.. So, using hydraulic pressure won't work.

Drilling a hole from the other side would mean drilling through the crankcase.

then find a tap of the appropriate size, and be prepared to destroy it . . . . sometimes, an easy out (or similar) will rotate teh pin enough that it begins to walk out on it's own . . ..

indr 01-11-2013 12:09 PM

Quote:

Originally Posted by WRW9751 (Post 20457228)
Snap and Mac make inside/outside pliers. A little heat and a pair of those pliers might just do the trick.

Do you mean circlip pliers? I have those, the tips are too big to fit. The inside diameter of the dowel is only ~3.35 mm.

indr 01-11-2013 12:14 PM

It is also not possible to send something inside to hook the dowel from the bottom and pull it out because the oil passage the dowel sits on has a diameter small than the inside diameter of the dowel.

I tired drilling (deWalt bits) the dowel from the top to maybe crack and break it and fish out the pieces but it seems to be made out of really hard steel.

twinjet 01-11-2013 12:19 PM

Quote:

Originally Posted by indr (Post 20457212)
The dowel is hollow all the way down. Where it sets in the crankcase, there is an oil passage drilled into the crankcase itself; i.e. there's no way to build up pressure.. So, using hydraulic pressure won't work.

Drilling a hole from the other side would mean drilling through the crankcase.

Is this a car engine crankcase? Is the oil galley plugged above the dowel? Sometimes oil galleys are drilled then plugged at one end.

indr 01-11-2013 12:26 PM

Bike engine. The first pic might have been a bit confusing so here' another:

http://i.imgur.com/5TgAS.jpg

The hole in which the dowel rests is machined into the crankcase. And that hole is flow through.

indr 01-11-2013 12:37 PM

Also JB Weld doesn't seem to stick to it very well.

Twilight Error 01-11-2013 12:44 PM

Quote:

Originally Posted by indr (Post 20457548)
Also JB Weld doesn't seem to stick to it very well.

Your best bet is a tap or an Easy-Out. The tap will create swarf that will need to be controlled, The easy-out may jam the pin tighter against the bore.

bomber60015 01-11-2013 12:48 PM

dowel pins ARE made of stern stuff . . . . . . .drilling will be messy . . . . try to get it to turn

sieg 01-11-2013 12:53 PM

Easy out to grab and turn the dowel, while heating the aluminum case. The case will expand faster and greater than the steel dowel therefor freeing the dowel.<?xml:namespace prefix = o ns = "urn:schemas-microsoft-com:office:office" /><o:p></o:p>


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