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hi, i had this tapping noise on my KA before since i installed the oil cooler for a while, i took to the shop and they told me my engine was running too much oil and will make the oil pump weak. that's why the sound came from. and they took off the cooler for me and the sound gone. it sounds weird but it works.
so i don't know if you had the oil cooler installed or what, hope this can give you an idea.
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