hello, i decided to try and drain some sludge from my 2200 tc because it runs hot . i tried to open the tap in the engine sideplate but the wing nut broke so i removed the whole assembly expecting to be engulfed by water at any moment ...but there was no water escaping so i thought it must be bunged up, had a poke around with a small screwdriver and there does not seem to be a hole into the engine ,so my question is , is it common not to have a hole or am i missing something , my thoughts are that perhaps there are different types of side plate and that perhaps mine has had the wrong one fitted , thanks for any replies in advance ,