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Timing Chains.
3 to be specific. One main chain drives off crank to intake cams and water pump, and two secondary drive off the intake to the exhaust cams for each bank.
Show these pics to your moms boyfriend. I don't think Nissan has used timing belts on any vehicles since 2001 ??? They're good for the life of the engine and rarely ever need to be replaced. The tensioner should probably be replaced at 100k+ if it starts having cold start noise and sometimes the guide for the tensioner breaks and you end up with pieces in the oil pan.