What can ruin your entire day?

bleep it off and get a threaded brass replacement.
Suitable anti-corrosion (Loctite) and/or plastic thread tape and you've got it licked.

CheersFidei defensor

Rosco

gday mike.
how the heck did you shear it in town.
ps above is a good idea plug so simple lol.
cheers
due to duck season coming
ive decided to hide out
love jemima puddle duck
back after the season

Out in the bush, you could fill the gap up with 2-part epoxy radiator/fuel tank repair stuff. Or carve out a piece of wood the right diameter and screw it in there as a replacement. Might need a cable tie thru the core and around the bottom tank to retain it.

Ok then, s'morning reversed out of our sloping driveway, stopped, handbrake on, got out to shut gate, shut gate, holly sh*t paj rolling towards me, get outta way, try n jump in door as passes, crashes through gate,pull handbrake (too late) hits boat trailer, top of trailer hitch snaps, bricks behind boat trailer wheels dont hold, boat crashes into rear brick wall and 2 out of 3 prop blades shear off. Later today all fixed, $350 out of pocket and handbrake adjusted!!!!! Time for a beer......

Will.

I think Will's in front at the moment by about a 1/2 a bonnet.

Your problem Mike: -

Boat bung forced into the hole. Sealant around it.

Could use a piece of cork [have to drink the wine as well so win-win].

Still gotta wonder what made it break if you weren't putting it in or taking it out. I always thought it was just one of those things that sort of just was 'there'!!

Dave

There is a 2 part mix called Ferrope (?spelling) available from plumbing shops. just mix equal parts. Wet hands stop it from sticking to your fingers. Is just like putty can be used under water - good for tinnies. Sets like a rock.

Tapered wood plug using some plastic bag as thread tape ? secure with cable tie / wire..

If you need to do an emergency fix on rad / hoses, a good idea is to release the rad pressure cap to the first detent to remove the pressure build up. that way you only need to overcome the gravity head of pressure in the system, not 15 psi or so. Yes this does lower the boiling point of the fluid , so you then have to take it real easy and watch the temp and water levels. Some of that metal filled 2 part putty in tubes may be handy to carry as well, seals fuel tanks etc as well. CheersMoo... everyone knows what a Jackaroo looks like :-)

I always carry a two part epoxy. The stuff I use is called 'J B Weld it'. I once put a hole in the sump of an offroad buggy I race. Oil was still hot and the oil pressure in this thing is stupidly high. I used some of this stuff and never bothered replacing the sump. I've done numerous races since and never had a problem. It's a lot stickier than most expozies out there and sets like a rock. It can be used with all manner of oils and fuel too. Always works a treat.
Cheers,
Justin

Mike,
Had a similar thing happen to me, only at the top end of the radiator, a breather thing , still needed to plug it so radiator could pressurise. I used and swear by Selleys "knead it", its a two part epoxy in 1 inch plastic tube with the consistency of plasticine.You only cut off as much as you need,takes about 10 minutes to set like steel and can be drilled and taped, also good for leak in fuel tank.
Cheers David

Many thanks to all of you - the respnses have been very helpful. I am now going to source some of the recommendations.
Again my thanks
MikeToo little time in the bush!

Had the same thing happen
hammered a screwdriver into what was left of the plastic plug in the bottom of the radiator, screwed out the remains.not much risk figured plastic would stuff up before I damaged the metal bottom tank.
found a bolt , yes a plain old bolt ,just like the ones in the bottom of the emergency tin of nuts and bolts you carry with you you when you go bush ie lots of different sizes &threads etc , just put the bolt into the drain plug ,put some water in and thats that. was still there when the car was traded 2 years later.

If I hadnt had a bolt with the right thread i would have most likely used U-needit.
repaired a 2h themostat housing on the 60 series up the gulf in 2000. Got to Darwin and got a replacement a week later.If not for a 4000km trip home I wouldnt have gone to the effort of changing it over. The repaired one wasnt leaking at all.