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when i press hard the accelerator, there is sometime a "krek krek krek" sound somewhere inside the engine..they said its the rocker arm..some said loose nuts inside engine..please help what is it so i could refer it to the mechanic for instant job. thanks
 

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Can also be a diesel sound, when the engine timing is not correct (elongated chain for instance).

Rocker arms and the camshaft can be easily inspected when you remove the valve cover and turn the engine over by hand.
 
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