Hello, I hope I can offer you some assistance.
Is this a D22 or a D40 Navara? If you're unsure do you have the registration number?
Let me know and I'll reply as soon as I'm able to.
I think it is a D40. Reg. SP56 YDV
yes the vehicle is a D40.
With regard to the valve clearances on this model there is no specified interval, if you feel there is excessive valve train noise then check the clearances. The figures for these are,
Inlet 0.24 to 0.32mm
Exhaust 0.26 to 0.34mm.
The clearances should be checked on a cold engine.
Let me know if I can assist further.