Dowel pins ?

[blade7]

I want to remove some steel solid dowel pins from an alloy block, what tool do I need for this job ? Thanks.

[Steve_D]

I think you first have to accept that the dowel will not be re-useable.

From that point on your choices are...
Lock a drill chuck on to it and lever it out.
Mole grips
Weld a nut onto it leaving a gap below the nut so you can get a lever under.

Heating the alloy will help in all of the processes. Note...when you heat an item with a hole in it the material expands and you could suppose the hole would close up but the opposite is true, the hole enlarges.
The steel dowel will also get larger but the expansion rate of alloy is larger than that of steel.

Steve

[blade7]

Thanks for the reply, I have seen a kit that uses a collet combined with a slide hammer but buying it for a one off isn't practical. Another option is to drill through the middle of the dowel, fill the hole with grease and hammer in a pin so the grease forces the dowel out. I think heating the surrounding block will be required.

[Steve_D]

blade7 said:

Thanks for the reply, I have seen a kit that uses a collet combined with a slide hammer but buying it for a one off isn't practical. Another option is to drill through the middle of the dowel, fill the hole with grease and hammer in a pin so the grease forces the dowel out. I think heating the surrounding block will be required.

The pin may be quite hard so drilling could become a pain.
As said, accept that you are buying a new pin and go for it.

Steve

[blade7]

Replacing the dowels wont be an issue. Two are in the top of the block so machine shops must have a way of removing them when facing the deck surface. As you said heat is probably the first thing to try, looks like I'll be buying a small gas torch.

[226bhp]

It depends on how well the are fitted in, if they are just thin locating dowels often winding a tap in sees them spin and pull out.

[m4tti]

Put large thick washers around the dowel and twist/lever the dowel out with mole grips. Recently did this.. worked fine with no damage to the block

[TheRealFingers99]

If you can find an anchoring bolt (rawlbolt kind of thing)to fit the centre use that as the basis for a DIY slide hammer.

Alternatively, find/make a punch that will tightly fit the centre, fill centre with grease, sharp bop with hammer should "hydraulic" the dowel out.

Edited by TheRealFingers99 on Tuesday 17th June 14:22

[stevieturbo]

Have you actually even tried the obvious things like vice grips ?

What size dowel pin are you talking about ?

[Sardonicus]

On the Rover V8 you can just use one of these to twist them out and they are still serviceable too this is what I use made by Klann but there are cheaper copies/alternatives, however I am assuming they are solid if not and they are hollow then they are easier to remove

[blade7]

Sardonicus said:

On the Rover V8 you can just use one of these to twist them out and they are still serviceable too this is what I use made by Klann but there are cheaper copies/alternatives, however I am assuming they are solid if not and they are hollow then they are easier to remove

I've been looking at these on ebay, the pins are 8mm solid in the deck, 10mm I think for gearbox mounting.

[Steve_D]

blade7 said:

Sardonicus said:

On the Rover V8 you can just use one of these to twist them out and they are still serviceable too this is what I use made by Klann but there are cheaper copies/alternatives, however I am assuming they are solid if not and they are hollow then they are easier to remove

I've been looking at these on ebay, the pins are 8mm solid in the deck, 10mm I think for gearbox mounting.

Doesn't look much different to the drill chuck I suggested in my first post.

Steve

[Boosted LS1]

Machine shops have dowel pullers that take them out in an instant.

[blade7]

Steve_D said:

blade7 said:

Sardonicus said:

On the Rover V8 you can just use one of these to twist them out and they are still serviceable too this is what I use made by Klann but there are cheaper copies/alternatives, however I am assuming they are solid if not and they are hollow then they are easier to remove

I've been looking at these on ebay, the pins are 8mm solid in the deck, 10mm I think for gearbox mounting.

Doesn't look much different to the drill chuck I suggested in my first post.

Steve

I'm guessing the jaws would have more grip and you'd be able to tighten it up and turn it easier with a couple of spanners.

[blade7]

Boosted LS1 said:

Machine shops have dowel pullers that take them out in an instant.

I expect so, but not all would charge me for an instant .

[G600]

blade7 said:

I expect so, but not all would charge me for an instant .

Most would do it for a tenner if you went in via the shop rather than the office...