Removing sheared bolts - Help!

Samz9090 · 10 February 2010, 17:50

Just another question regarding my sheared bolts on the back of my mariner 25. I have phoned an engineering company who said they can probaly get them out. They asked me if it would be ok to heat them up. Is it advisable to heat the bolts up? The casing is aluminium after all. The other option is to weld a nut onto the exposed 2 threads. Anyone got any thoughts on this?

Ive been told by the outboard mechanic that it needs to be done carefully otherwise ill need a new block

Id say there is about 5-6 threads left inside the hole anyway.
Thanks.

Downhilldai · 10 February 2010, 18:25

Best to take it to the engineers and let them see it. Welding a nut on may work, but they'll probably end up drilling them out and either re-tapping the casting or inserting helicoils. Either way, someone who knows what they're doing should get it sorted quite easily.

kitten · 11 February 2010, 10:03

If you are anywhere near kingsbrige/ salcombe pop it over and I'll whip em out for you
07855850506

chewy · 11 February 2010, 10:48

Quote:

Originally Posted by kitten

If you are anywhere near kingsbrige/ salcombe pop it over and I'll whip em out for you
07855850506

kitten · 11 February 2010, 11:38

Pervert, must be that rubber suit you wear all the time.
Neck seals restrict blood flow.

Samz9090 · 12 February 2010, 19:16

Kitten, thank you for your offer, I may have to take you up on it. Im taking the engine to tony hole marine tomorrow to see what they think. Ill let you know how I get on.

Samz9090

Downhilldai · 12 February 2010, 22:40

Taking it to any firm with 'marine' in their title is going to cost you.

Samz9090 · 13 February 2010, 10:01

I agree. Id love to be able to do everything myself. At the moment im so bogged down with work I doubt im even going to have time to use the boat! haha! My overtime should cover the cost

Downhilldai · 13 February 2010, 12:50

Perhaps an engineering shop would be a cheaper option?

Samz9090 · 13 February 2010, 13:58

I thought that. My engine needs a service aswell. The time I start lugging a 52kg outboard across Plymouth on my own I may aswell just let one company do the work. For the sake of a few quid (and my back) it just aint worth it.

tkorsak · 13 March 2010, 22:41

Build the dam around the bolt from plastic syringe material and heat gun glue and dissolve the bolt in nitric acid!
It is the normal engineering practice for steel bolts in aluminum cases.