Owen:
It's not the timing chain, but the timing chain <guides> that need replacing.
For all the info you need, go to our home page to "search articles" (those are some threads from this club's old board that we saved)Type in the "look for" window the word "guides", and in the "look in" window type in, look in "infiniti articles".It will bring up several threads, which are mostly Q&A on this exact subject.
Read the one titled "90-93 Q 45 guides" ( or very close to this title).
It's our most comprehensive thread on this subject.
Then it will be easier (and LOTS cheaper) to solicit estimates for the work you actually need.
Good Luck and keep us posted,
Fred...
