Deck Bolts push Lawnmower

[rrrhre2s]

Need to remove the bolts from a Briggs engine attached to a rotted out deck.
Trying to save the engine for a newer mower with a bent crank and busted sump.
Unlike the older bolts with 9/16" heads these had 1/2" heads which have rusted away.
This engine and deck was only 3 years old looks like the underneath of the deck has been dipped in acid, nothing but rust.
The engine ran fine before junking the deck. Cut motor from deck with a screwdriver.

It has been suggested to MIG weld a nut to what is left but I don't have a welder.
I don't know except for the engine it's self if there is enough metal to get a good ground to weld anything.

Will probably junk both soon.

Any ideals ?

rrrhre2s

[bgsengine]

grind the hex down to 12mm or 7/16.. or borrow an automotive stud remover tool and grind down head of bolt to fit.. with any luck they wont twist off in whih case you'll have to drill 'em out.

[aj-allen]

They also make bolt extractors:

[Mek-a-nik]

Sometimes you can hammer an old socket over it. Like BGS said, a metric.
Heat it real good too.

[bobodu]

Cut em off with a disc and drill out....use nuts and bolts.

[Fulltilt]

They also make bolt extractors:

Them are your best bet. You also want to smack the heads with a hammer ( like driving a nail) to help loosen them up. Works sometimes.
That far gone though, they will probably wring off.

[Arkie]

Cut em off with a disc and drill out....use nuts and bolts.

Right on as above!

1/4 or 5/16 bolts will do on a push mower. (get them tight and use threadlock or they will work loose)

[Matt]

like all of the above have said, cut it off, most everyone has a dremel tool or get an arbor and discs for an electric drill, takes some time with the drill but beats trying to "will" them out!