Honestly just buy a chiltons repair manual. It has everything you need to know about the car. It covers 1970-1988 Nissan z's or zx's
A Chiltons Manual explains it in detail.
Chiltons owner manual has complete eccm trouble codes
This is spelled out in your owner's manual. It is also listed on a placard under the hood. .033 per chiltons manual
"Chiltons Repair Manual" usually available at local library.
There is either a tensioner or an adjustment screw on a pulley. A Haynes manual or Chiltons manual will help with the routing of the belt, and how to adjust the belt tension as well. Usually the idler pulley is used, before loosening the top bolt , loosen the center bolt of the pulley.
You need a manual on it to show you how and it will tell you.
loosen the manual tensioners and the alt bracket.
Manual or auto tranny?
get a repair manual at auto zone for 24.99.
the same way you replace it on any car you buy a chilton manual for your car and a thermostat and then follow the instuctions in the manual