Blown head gasket?

[Hally]

G'day guy's need your words of wisdom my resivour tank has been over flowing and water sprays out the side of the bonnet today when driving there was a bit of steam coming from the same spot and the water temp went cool then rised rapidly so I pulled over turned the car off opened the bonnet and found a crack in my resivour tank and was bubbling rapidly like it was going to explode once cooled down I opened up the cap and there was no water in the tank so I filled it up started the car and it bubbled quite badly like a boiled jug of water and the temp went straight to hot and there was a bit of water around the tip of the exhaust so I put it on a tilt tray and took it home as I didnt want to risk it . any thoughts on what is wrong ?? The car is a defender with a 4.6 V8 I've never had overheating problems for 2years Thats when the conversion was done and there has been no mods to it for 2years

[Nice_Surf]

It sounds like you've done a head to me

[lokka]

Could be many things tho id be lookin at headgaskets first then maby a sliped liner as its a 4.6 they were renowned for sliping liners and leaking water into the cylinder or vice versa leakin combustion gasses into the cooling system ...

If your not spanner friendly find a good landy man so u get it sorted right first time