The reason why the engine does not reach the rated speed and how to deal with it?

Reasons and solutions for the engine not reaching the rated speed
A use the wrong type of lubricant
Treatment method: replace lubricating oil and filter
B cooling start system failure
Treatment method: Check, repair the cooling start device, and replace if necessary
C start temperature is too low
Treatment method: see “Coolant temperature is lower than normal temperature”
D Excessive engine oil
Treatment method: Check the lubricating oil level
E Turbocharger seal and bearing wear
Treatment method: check/replace the turbocharger
F Use of wrong type of gradeable fuel
Treatment method: change the fuel
G engine is due for overhaul
Treatment method: overhaul the engine
H cylinder leaks
Treatment method: Check the cylinder head and cylinder gasket, and replace if necessary