2004 Other Nissan Models Nissan Quest

I know a few reputable mechanics. They all tell me that it takes very special tools to do this job. The tools from Snapon are about $600. No one wants to invest that kind of money to do one van. I have challeneged the dealership with the Nissan factory folks. I have complained about the rattle for over 30K miles. It had the 100K extended warranty from Nissan. I think I have been pushed around to keep from the warranty having to pay for the repair. I hear that this engine is subject to these kinds of failures due to a plastic type of tensioner. Also, I had complete double catalytic converter failure which cost me $1400. No one but the dealer would touch it. That happened about 15K miles ago.