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1995 Nissan 6cyl manual Hooked timing light to number one spark plug wire, marks on pointer do not line up with any markers, seems to be 180 degrees off. This truck runs fine, idle is smooth and can not even tell its running. Mechanic says the marks should line up for smog inspection. Any ideas?
 

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NF Mod/Nissan Master Tech
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Assuming that the timing is being checked properly, it's possible that the rubber has deteriorated in the harmonic balancer and the outer part with the timing marks has spun around.
 
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