This video shows how I replace a timing chain on a 2007 Nissan Frontier with 200K miles. The engine had a whining sound at high idle. I decided to replace components before it breaks and damages the engine.

Video Contents
Removal of covers and fan to access front of engine
Removal of PS, Alternator, and A/C pump
Timing Cover Removal
Replacement of timing chains and guides; Water pump also.