Removing a stuck bolt from engine

54kroc

I was taking the head off an old megane scienic and 2 of the bolts for the head sheared off, I still got the head off but i'm looking for ideas on how to get the bolts out of the block,there's around an inch of each above the block,
Would they come out if I put two nuts on the bolt with some wd 40 and some heat?

E39MSport

Sounds reasonable to me - weld the nut on if you can. If that doesn't work then you can get a 'stud extractor' kit.

kyote00

the stud extractor kit is best option

remember to make sure the the hole is completely clean of oil/wd40 when you put in new bolts otherwise they may not torque correctly and break....

E39MSport wrote: »

Sounds reasonable to me - weld the nut on if you can. If that doesn't work then you can get a 'stud extractor' kit.

DublinDilbert

E39MSport wrote: »

Sounds reasonable to me - weld the nut on if you can.

Yea if there's some of the thread exposed on the head bolt, i'd thread on a nut and put a bead of weld around the inside of it. The heat from the welding may way also free up the bolt a little.

landydef

i blew two bolts on my exhaust manifold completely flush before and i got an "easy out" kit, did the job great just take your time with it , im sure the stud extractor kit and the "easy out" are the same thing

air

Wurth do a spray penetrant called "Black Magic" and it's just that, magic.
I've used it on things that I was previously hanging off with a 1m extension bar (I'm not too light) and after a spray of that stuff it just sailed off. Worth a shot anyway, I genuinely couldn't believe how effective it was the first time I tried it.

CJhaughey

landydef wrote: »

i blew two bolts on my exhaust manifold completely flush before and i got an "easy out" kit, did the job great just take your time with it , im sure the stud extractor kit and the "easy out" are the same thing

Nope, different animals. The stud extractors work by grabbing the stub of a shaft and tightening down.
Easy-outs are a left-hand thread tapered screw.
Easy-outs can get you into a world of bother if they snap while trying to remove a siezed bolt.
They are much harder than most drillbits.

phelixoflaherty

Vise grips

air

phelixoflaherty wrote: »

Vise grips

Good one!

phelixoflaherty

Well there is an inch sticking out

air

That may be so, but something the length of a vice grips isn't going to give you much leverage on a head stud.
I mean think about it, the OP has sheared the bolts trying to take them off, they're likely 10-12mm in diameter - bolts this size take a "lot" of torque to shear.
I'm not aware of any vice grips that will provide the grip or leverage required but perhaps there are huge ones on the market.
Any time I've removed head studs I've used a 1m long extension bar.

dutchcat

landydef wrote: »

i blew two bolts on my exhaust manifold completely flush before and i got an "easy out" kit, did the job great just take your time with it , im sure the stud extractor kit and the "easy out" are the same thing

different things,if an easy out breaks on you you are f....ked, another block or spark erosion,i rekon a nut and a tag of weld is the best option but i would try a vise grip first ,a fresh one not a worn or cheapo one

phelixoflaherty

I'd give it a shot first with some penetrating oil.

gyppo

phelixoflaherty wrote: »

Vise grips

Major component of the farmers toolbox.
Fits all and f**ks all.

Seth Brundle

do it the Clarkson way and just hit it with a hammer!

54kroc

Thanks for all the advice guys, I bought some good penetrating oil and a stud extractor this morning and the bolt came out the first time I tried with very little force needed,
Cheers.

E39MSport

Glad to hear it.