When performing EPQ or any heat / cooling system testing it is requried to install blocked open thermostats - most our thermostats utilised are of similar design and see attached showing example of spacer length generaly required and where to install ...
LSB 16-07 available in Onedrive highlights details pertaining to MTU continuous improvements made to coolant thermostats in use on 4000 & 2000 series engines.
To prevent misdiagnosis TSD 20-10 Issue 2 has been developed, it contains troubleshooting procedures when dealing with injector open load faults (ADEC code #'s 341 - 360).