Engine Coolant Leak

a little half circle cap thing is a bit hard to place sorry, can you take a pic and post it?

here you go

Sorry can you re send i lost the image, my error.

i think i have a dead engine at work, so if i can locate the part i will get a better idea as to what is going on. i found the pic, it looks like the rubber 1/2 moon grommet under the rocker cover, this will not be the leak, check around the rocker cover and see if you can find any evidence of coolant leaking, i will still look at the engine at work as well.

no i have sat there and watched it leak. its really slow. like a drop a min

I will check the engine at work in the morning, i am in Australia, it's 10-35PM here just now, so it will be in a few hrs time.

See the pic, you will see the 1/2 moon seal on the rocker cover, is this the place you see the leak?

yes that would be it. how do i fix it

There is no coolant behind that seal, i would get the cooling system pressure tested and look around the thermostat housing and the thermo switches on the drivers side, i do feel that coolant is working its way around the rocker cover and coming visible at the front, get this done first.