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Q: want to replace uper timing chain idler gear only on 1996 Nissan Sentra

Rookie cbe0621eac06868b3efe0d8d1d3611e23c60d3114864ea2ec19a68cfbd3eebab
mechanic say is the only part looks bad and is the reason the uper timing chain is loose
(1) Answer
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This engine has problems with the timing chain particularly if the oil had not been changed frequently. The lower chain is difficult to replace and requires a lot more disassemble.