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I recently picked up a 95 base model 240sx with that same noise coming from the motor (right under the valve cover)! Took it the my friends shop to work on it & once I took of valve cover noticed that the very top chain guide was broken just laying ontop of the timing chain. Went to Nissan dealer to buy new part & part is discontinued, no longer available because motor doesn't really need it. Tech told me as long if the chain is working properly, don't need to worry about it. So I put everything back in place with new valve cover gasket, noise went away, motor sounds nice & strong!!!
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