1993 Z32, last MAJOR time in a shop, 7 years ago..day before last on a 5 mile run, the smell and screech of burning rubber / metal, jack up on ramps, dropped splash shield - as suspected; idler pulley seized up!..took a 1/2" drive twenty inch torque wrench / breaker bar to CRACK it loose (14mm adjusting nut, not bolt)..and "PB Blaster" to soak in first!..Another Example of WHY you don't trust these cars to DRONES IN A SHOP!!..the idiots OVERTORQUED the nut to get a failure and return work! {The Nissan Engineers are WAY smarter than these stupid ****s, so it didn't show up for SEVEN YEARS}.....YES!! HOUSTON Z "Shop", U HIRED Drones to work on my car back when and charged me $100 an hour!