I had a 2006 Xterra with the infamous timing chain guide wear. I replaced everything behind that cover!! (OEM Nissan parts) except the oil pump.
Guess what, I noticed cavitation on every start up. Pressures where fine, but hell of a gurgle on start up.
I had similar mileage. Not sure how the VQ oil pump comes out, but the Xterra had two oil pans, and the upper one required removal of suspension and stuff. The reason I got lazy.
The timing cover was time consuming and labor intensive, but the actually chains and guides were rather simple about 2 hours. Did all the work myself. Took my time, took me two days.
So yes, do the oil pump and the chain tensioners, which I assume are the hydraulic oil pressure type. DO NOT get lazy with o-rings and gaskets. As another mentioned. Replace every rubber or paper no matter how good it looks. You only get one chance. ( more chance if you have time and money
)
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