If it is the 8 valve engine then ensure you adjust them when the engine is cold. inlet- 0.10mm-0.15mm, exhaust 0.25mm - 0.30mm. if it is the 16 valve engine then the valves are hydraulic.
DONT KNOW WHO HAS TOLD YOU THAT ABOUT THE 16V BUT THEY ARE NOT HYDRAULIC THEY ARE ADJUSTABLE
yes
valve variator
You turn the valve cap anti-clockwise!
there isn't a drain plug, you will have to remove the bottom hose
EGR valve sooted up
Common problem have Solenoid replaced Usually the pressure regulator valve.
For D7F 8 valve engines: Intake valves - 0.10mm, Exhaust valves - 0.20mm
The idling speed is automatically sensed ....and set by the Air control valve
Worn valve, bent valve, damaged piston and/or rings, head gasket failure.
inlet is 0.10 to 0.15mm and exhaust is 0.25to0.30mm ...
clearances valve nissan rd8
the valve clearances is 3000 of a ince