My valves at idle completely warm have a pretty good noice coming from them...i have 87,000 on it and i dont know if the guy before me has ever done it...are they adjustable and is it a normal thing to do to a car ?? thanks

:radbounce

 

Nissan does not include valve clearance adjustment with any scheduled maintenance. It should be done if and when the valves become noisy. On most cars this service will never be needed.

Adjusting valve clearance not as simple as turning an adjustment screw. Each cam lobe bears directly against a disk-shaped steel shim of precisely machined dimensions. Changing valve clearance is done by removing the shim and substituting another with a different thickness. This service procedure requires special tools. The shims are made in thicknesses ranging from 2.32mm to 2.95mm. They can be purchased from the dealer. I'm not aware of any other source for these shims.

See Chilton (page 1-30) or Haynes (page 2B-5).

 

I've got the same problem... im bringing it in this friday...