Piggin Rocker shaft bolt snapped.

Further Saga.

Managed to get the down pipe of and got to the head.

Head bolts were so tight i cracked an ext and a socket.

But further to that, whilst taking off the rocker shaft a bolt snapped off. Didn't even turn before it snapped.

SO against my better judgement my father in law talked me in to drilling it and getting a tungsten screw extractor.

That snapped inside the bolt.

Some hammering, and drilling later and i now have a messed up bolt still stuck in the head with a tungsten carbide centre that eats my drills for tea.

Any suggestions??

I plan to take it to a machining shop tomorrow but if they can't do anything with it does anyone have a spare 200tdi head they want to sell?

I can purchase or swap/ p/x for a truck cab roof back and all fittings or a ifor williams back.

Wish id not started now!!

Even a professional machine shop will find it virtually impossible to drill Tungsten but they can use a machine known as a spark eroder to eat away the broken stud. It takes time but is not that expensive. Cheaper than a new head.

Had a similar thing happen and the machine shop froze the area of the head and the snapped off bolt with one of them plumbing kits designed to freeze pipes. Believe it or not the thing became loose enough to turn out by hand once it was really cold. The guy doing it was wearing gloves or course and he said its a last resort but often works.

Shifty1962 said:

Even a professional machine shop will find it virtually impossible to drill Tungsten but they can use a machine known as a spark eroder to eat away the broken stud. It takes time but is not that expensive. Cheaper than a new head.

Had a similar thing happen and the machine shop froze the area of the head and the snapped off bolt with one of them plumbing kits designed to freeze pipes. Believe it or not the thing became loose enough to turn out by hand once it was really cold. The guy doing it was wearing gloves or course and he said its a last resort but often works.

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I'd try this! The freezer kits are about £10. I'd warm the head up first with a blow lamp. Not too hot but it'll help as it's the diferential temp between the stud/bolt and the head that counts. get WD40 on it while it's hot then get the freezer on the bolt.

Well.

After phoning and driving round i got quotes for electro erosion between a minimum of £20 to set up to £2000.

Finally visited a very nice bloke who did it free of charge, so the hardened bit is no more!

Then had to pay £30 for the nut taken out.

While its in its being skimmed.Im not going through this again any time soon.

Thanks for all the help guys.