Broken dowel pin

Icuby · Jan 6, 2010

This may have been discussed before,but I have dowel pin in the back of an engine that is broke flush,no through hole so can not drive out. Any and all help appreciated. Thanks guys.

tlak · Jan 6, 2010

Common welder trick was to weld a nut on busted bolts, probably would work on a dowel.

Errin OH · Jan 6, 2010

Or drill and tap it . Screw in a bolt so you can pull it out.

CJ3b_jeep · Jan 6, 2010

I second that, it think it'd be your best bet to weld a nut onto it.

Fordman6442 · Jan 6, 2010

First weld a lrge diameter flat washer with correct size center hole to the dowel. Then weld a nut to the washer and use a slide hammer to pull it out.

old · Jan 6, 2010

Drill a small hole in the center then tap that hole then take a slide hammer and hook it to that bolt and it should pop right out. I would try that first then if that does not work go with the washer/nut and the welder. Problem with the welding in that area is you might leave some slag etc and that could than cause a problem latter

trucker40 · Jan 6, 2010

First plug any holes that go to the oil pan with rags.Drill a hole in it,tap threads in it,screw a bolt in it,then a crowbar or claw hammer or slide hammer should pull it.

TimV · Jan 6, 2010

The fun part about a dowel pin is it is probably going to be hardened, which will make drilling, tapping, etc. considerably more difficult. You may be able to use a combination of methods--perhaps welding two nuts together, welding them to the pin, then using a slide hammer on a bolt threaded into the nuts. That way you'll get away from having to drill and/or tap it, which may require carbide or cobalt tooling. You may get lucky and the dowel will only be case-hardened, in which case another thing to try is drilling and tapping the "soft" center for a grease zerk and pumping grease into the hole, which will push out the dowel pin.

trucker40 · Jan 6, 2010

I have drilled them before with no problem.Im not saying his wont be a problem,just that I have done it with no problem.Maybe they are only hard on the outside if he is lucky and the inside is soft.

Im not saying that you cant weld something like that.If I did somebody would weld it just to show me I was wrong.However something that small is usually hard to get a good weld on it.If you cant drill it then thats whats left but its better to tap it if you can.Unless you are real careful with sparks flying everywhere up on top of a motor you could have a fire,you could weld everywhere except where you need to and you could mess something else up,you could have spatter stuck to a cam lobe or crank journal or something.You could cause more damage.

RodinNS · Jan 6, 2010

I would try drilling it first but if it doesn't drill easily I'd not waste much time on it. Weld a washer on it, then a nut, then pull it with a slide hammer.
If it's down in a hole there are rods like a Sodel 335 that work for that purpose. They produce a slag that will prevent the weld metal from adhering to the bore provided you don't set about burning rod into the bore directly...

Rod

Anonymous-0 · Jan 6, 2010

May be better to forget its there.

Don-Wi · Jan 6, 2010

Depends how tight the press fit is. I have welded a nut to it and did like I would normally do to a bolt in the same situation, but it was a lighter press fit. If you do try drilling, you better have an extremely sharp High Speed Steel or Cobalt drill bit, and go very slow and have lots of oil on it.

You didn't say what size the dowel pin is, as that may play into how easy it is to remove. I'm gonna guess 1/2"?

Donovan from Wisconsin

Broken dowel pin

Icuby

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tlak

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Errin OH

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CJ3b_jeep

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Fordman6442

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old

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trucker40

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TimV

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trucker40

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RodinNS

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Anonymous-0

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