Fuel average engine performance and smooth running depends on how better your Tappet setting is.For setting Tappet on Perkins engine valve clearance the 4cylinder process is the same.
For setting Tappet on Caterpillar engine valve clearance the 4cylinder process is the same.
For setting Tappet on Cummins engine valve clearance the 4cylinder process is the same.
For setting Tappet on Mitsubishi S4L engine valve clearance the 4cylinder process is the same. The clearance might be different but the process is the same for all engines for engines firing order 1342.