over filled coolant.
 

Ok folks i thourght the coolant was low as i couldnt see anything through that opaque window. So i topped it up and its over filled it. So i pulled the bottom rad hose and let about 200ml of water out but i can still see nothing in the window.

Any ideas if its going to do any damage?

aaaaand how the hell do i check? ive had a torch on it and everything!!


oh and is there a drain plug?

Re: over filled coolant.
 

no drain for overflow bottle.
it will not damage anything.

Re: over filled coolant.
 

it won't damage owt, but as I overfilled one of mine not so long ago, it started to overheat the engine for some reason( pressure of coolant with nowhere to go?) So all it did to remind me it was too full, was it had a blue pee over the patio, out of the breather pipe. Think YC drained some out, plus took the cap off the radiator to make sure all the air popped out, whilst running it for a few secs

Re: over filled coolant.
 

You've drained coolant out of the main circuit, not the "make-up" bottle.

The way it works is that the engine and rad are effectively a closed circuit, with a pressure valve built into the rad cap. This circuit should be completely full of coolant, right up to the cap.

When it heats up the coolant expands and the pressure rises until it gets past the pressure valve in the cap, and then a little extra coolant gets pushed out and down the small hose to the bottom of the bottle. The bottle has coolant in it up to a certain level (little window in the side), which allows enough spare volume to take the expanded coolant from the engine.

When it cools down again the coolant contracts and it sucks coolant from the bottle back though the cap to "make-up" the coolant in the engine circuit.

The idea of this is that it allows the system to de-gas from the rad cap, a normal phenomenon, and always make-up with liquid coolant from the bottom of the bottle.

Fill the system back up at the rad cap, then remove the small hose at the cap housing and lower it down to allow coolant to run from the bottle. Running with the engine circuit not properly filled could be expensive.

Re: over filled coolant.
 

how the hell do you get the rad cap off. this one seems solid?

Re: over filled coolant.
 

oh and if i run it up will it not just take the extra fluid from the tank to top its self back up?

Re: over filled coolant.
 

rad cap bayonet fitting, usually just push down and undo anti-clockwise a quarter turn or so, like taking a light bulb out of a socket.

It will make-up to a certain extent, but if there's too much air in the system the pressure won't build up enough to force any gas out of the rad cap valve (it's too compressible, unlike the coolant).
If as you say you've taken 200ml or so out, there's a risk it won't make-up. Defintely top it up.

Re: over filled coolant.
 

there is little screw in side of cap,loosen it.after that push down and turn.

Re: over filled coolant.
 

Aha! I guess that's on the naked only then, as an anti-tamper measure? It isn't there on the faired version.

Re: over filled coolant.
 

yea,round caps have it.