What is leaking?

[thu187]

Hi guys,
I've got coolant leaking but I'm not sure what it's from, or rather what to call this thing.
It's at the back of the water pump but I don't know if it's still part of the water pump or not.
Can someone with more knowledge than me (everyone lol) tell me what it's called?
It's a 4A-GE.
In the first (zoomed pic) it looks like a plug of some sort with a seal possibly. I'm thinking I can just replace that bolt thingy + put on gasket goo and I'll be right?

Cheers

[pandaah]

looks like some sort of housing?.. pritty hard to tell from those pics, what hoses go near where the stain is?.. make sure there not leaking down a hose and trickling off making you think its that bolt

[allencr]

Isn't that from the little steel bypass tube, sealed with O-ring on each end, that goes between the pump and the head's coolant outlet? Must be rusted through judging by the color, or rusted enough that its O-ring surface is NFG.

[RT40Corona4AGTE]

yep it looks like the steel bypass tube has a fubar o-ring or simply rusted through. I would recommend removing it and cleaning up the o-ring surface and fitting a new o-ring.