Am I a dumb A$$

[Dusty Vic]

I had a couple of broken exhaust studs I removed from the heads on a 510 gas engine. There was enough stud exposed that I could get a pair of vise grips on them so I got out the torch, heated the head and turned the broken stud out. All sounds good so far. However after the heads cooled down I noticed what I believe to be cracks coming from two of the bolt holes. Is it possible that the heads cracked from the heat, or where they cracked before and I didn’t notice it until I got the dirt & oil burnt off. Now where do I go from hear?

[mrsmackpaul]

Well you buggered that up, thats for sure

There is good news, you arent the first person to do this, I can speak from experience here

Hopefully the head isnt going to leak, if it does leak you will need to find a new head 

Cast iron cant he heated like this, for future reference 

Drill the stud out a fare bit, fill the hole with a mig welder and build it up enough to grip onto with vice grips and it will just wind out

 

I wish I had a better answer but you cant heat big lumps of cast iron like this and expect to get away with it 

Not been a smart ass just answering your question 

 

 

Paul 

[Dusty Vic]

Thanks, Paul that’s what I was afraid of.
Too make it worse I didn’t notice on the first head until after I did it to the second head. 
 

Well at least I learned something today. 

[topo]

I could have made the same mistake  thank you for sharing  .

[mowerman]

 i dont have any advise sorry man...bob

[Dusty Vic]

It’s been confirmed, I am a dumb A$$. Today I putt studs back in the bolt holes and putt water in the engine. It immediately started leaking, as I was afraid of. Worse than that thought it was leaking inside a couple of the exhaust ports. If anyone has a pair of heads for a en510 I’m in the market.

[mrsmackpaul]

Maybe not all is lost yet, heads can be welded up and machined again 

You need a specialist shop for this but it can be done very successfully depending on were  the crack is 

Dont feel to bad, the only people that dont make mistakes have never tried, I learnt the same way once some years ago now, my head was damaged beyond repair 

 

 

Paul 

[Dusty Vic]

Can anyone tell me if a 540 is basically the same as a 510? Will the engine bolt up the same, will the accessories mount the same ext. Any information would be greatly appreciated.