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A light knock at the top of the engine, or ticking, is the valve gear. This is not a worry if it eases when the engine is hot. A heavier knock down lower indicates trouble with the engine bearings, and this will usually get louder as the engine becomes hot. These problems have arisen in Camrys due to engine oil sludging. This starves the bearings of oil and they wear quickly. Toyota says it affects engines up to a 2001 build, but I have heard of 2002 engines being affected as well. Toyota insists it is due to owner neglect, but they have taken it on in limited circumstances:
A light rattling sound when the engine is under load indicates you should try a fuel with higher octane rating, although this would be unusual in your model unless you are using a fuel with high ethanol.
2.check if the engine oil light is offing in time or not,it is like the engiine oil is not being lifted in time by the oil pump,
3. what should do if is number 1 u have change the water pump and if it is number 2 then change the oil fillter drain the engine oil and replace with new one but this time around add oil treatment oil to the engine oil u change if it is sea 40