"I have a newly remanufactured Perkins 6.354 which has a persistent knock or vibration at all speeds, since engine was installed.
The builder swears it cannot be mechanical; but I can't get to the bottom of it.
The injectors have been removed and checked, twice.
Breaking fuel connections at the injectors does not indicate any cylinder is running any differently from any of the others.
Knock/vibration is NOT cylinder-specific, it is the same regardless which cylinder is off-line.
vibration is more severe under load.
NOT related to transmission or drive train; even with the transmission physically disconnected the knock/vibration persists.
Any suggestions would be appreciated, thanks."