Drifting out dowel pin in propshaft/ coupling.

[oldgit]

Peculiar (to me) dowel pin(s) in my coupling.
Visually it appears to be one small split dowel pin inserted inside another slightly larger one a Hollow Dowel ?
Need to get it out to draw shaft.
Looks a rusty pig to remove.
Do you attempt drift out both, the inner one first perhaps or if all else fails drill the things out and replace with new ?
Comments/advice welcome.
Having ago in morning.

 

[rogerthebodger]

Peculiar (to me) dowel pin(s) in my coupling.
Visually it appears to be one small split dowel pin inserted inside another slightly larger one a Hollow Dowel ?
Need to get it out to draw shaft.
Looks a rusty pig to remove.
Do you attempt drift out both, the inner one first perhaps or if all else fails drill the things out and replace with new ?
Comments/advice welcome.
Having ago in morning.

You get 2 types of roll/spring pins

You can also get tapered pins but they tend to be solid.

I had roll pins in my prop shaft coupling and I used a bolt the same side as the roll pin hole and propped the shaft to make if as fixed as possible and the wach the bolt through to drift the roll pin out the used a smaller bolt from the other side to get the first bolt drift out.

Oposing hammers will not do it as the roll pin will need too much force to extract it.

 

[Plum]

Peculiar (to me) dowel pin(s) in my coupling.
Visually it appears to be one small split dowel pin inserted inside another slightly larger one a Hollow Dowel ?
Need to get it out to draw shaft.
Looks a rusty pig to remove.
Do you attempt drift out both, the inner one first perhaps or if all else fails drill the things out and replace with new ?
Comments/advice welcome.
Having ago in morning.

Sound like you have a roll-pin rather than a dowel which means you will find it very difficult to drill it out due to the hardness of the material. If it does not move with modest hammer blows and a drift i would make some form of clamp to press it out. Could you post a close-up picture?

Www.solocoastalsailing.co.uk

 

[solent clown]

thanks for the post, i used two roll pins jammed inside each other last night to get the mariner on our tender working again after I broke the shear pin - a timely reminder not to leave it in there to rot.

 

[Norman_E]

thanks for the post, i used two roll pins jammed inside each other last night to get the mariner on our tender working again after I broke the shear pin - a timely reminder not to leave it in there to rot.

Change them for a proper shear pin or you risk stripped gears if the prop strikes something hard. I don't know what metal the Mariner uses but the one in my bow-thruster is brass and much easier to shear, and thus protect the gears, than anything made of steel.

 

[garvellachs]

Peculiar (to me) dowel pin(s) in my coupling.
Visually it appears to be one small split dowel pin inserted inside another slightly larger one a Hollow Dowel ?
Need to get it out to draw shaft.
Looks a rusty pig to remove.
Do you attempt drift out both, the inner one first perhaps or if all else fails drill the things out and replace with new ?
Comments/advice welcome.
Having ago in morning.

We have a Vetus coupling with two pins, as you describe. The thinner sold one locks the standard roll pin in place so has to come out first. It's tapered in ours so only goes one way - obvious by the marks on it from driving it in. The proper size roll pin punch is best for the actual roll pin. And a thinner ordinary punch for the inner pin. I supported the coupling with lots of timber blocks and wedges to take the sideways shocks: you will have to hit hard to hammer them out and your gearbox bearing won't be pleased. Lots of Plusgas beforehand to loosen it all up a bit? I'm sure a press would be better, but not easy to arrange. A bearing puller might help to get it started?

 

[solent clown]

Change them for a proper shear pin or you risk stripped gears if the prop strikes something hard. I don't know what metal the Mariner uses but the one in my bow-thruster is brass and much easier to shear, and thus protect the gears, than anything made of steel.

yes I am aware, have them on order. I used what was to hand as I had to pick Karen up from the slipway upriver...
Of course she went to the wrong slipway, so I ended up going from St Denys to Crosshouse in search of her, and right at the time the rowing club were launching, grumpy bunch seem to think it's a private slipway for only their use

 

[oldgit]

Decided from the comments, to have quick wimpy go at drifting out , getting a decent swing with hammer while holding drift is virtually impossible.
Thing is of course hidden away in bowels of bilges.

Need new shaft made up and the outfit doing the shaft want the old one as a pattern.
Plan Z is to cut shaft to allow removal with coupling in situ and sort on bench.
Want in bits anyway for ease of transportation.
Thanks all. OG.

Up date.......
Shaft and coupling removed after cutting into four sections with grinder.
Impossible to shift dowel pins in situ.

Another up date
Coupling in vice
Decent drift and good whack removed centre dowel.
Bit of heat and good hard whack shifted large dowel.
Remains of propshaft came out with gentle tap.