Installed new injectors in a cummins 6b 5.9 . Went from 9mm to 7mm injectors
and more white then before? the injection pump is in alinement . the washer where installed with new injectors. ??
How does the engine start? Does it fire right off when cranking with a very minimal delay, lets say within 5 seconds? If so, then it is not a compression issue.
Does it take more than 5 seconds to start and does it stumble or misfire at first and then start to become stable all the while it is smoking white with raw fuel odor? If so, then you may have an issue with compression or injector washer and or injector tip protrusion issues? What was the symptoms before replacing the injectors? Why were you replacing injectors, was it for this same reason? Does this B-Series Cummins have a VE Bosch Distribtor pump or a Bosch PLN P- Pump? Was the pump off for some reason and reinstalled by a dealer?
Sealing washer thickness changes where the spray of the nozzle is introduced into the bowl of the piston. If the wrong washer is introduced you can change the point at where the fuel is dispersed and can be putting fuel onto areas of the cylinder where it doesn't belong, this will give a white smoke unburned fuel odor, especially when at idle no load. Did this all come about only after changing injectors?
Diesel engines are already abundently rich with air when turbo charged, this is one reason why they are high in NO and NO2 emissions. Too much air doesn't give you white smoke and an unburned fuel smell. Timing, injector position (spray angle deflection and point of entry into the piston crown combustion chamber), valve wear, compression, water ingress (steam in cylinder), these types of issues will bring on white smoke.
If it were antifreeze, it would present itself as grey smoke and would smell sweet out the stern exhaust outlet, it would not burn your eyes and be strong in odor like fuel will. If it were a head gasket, you would push antifreeze out the overflow or around the cap when under a load, you would likely see higher than normal coolant temperatures and usually in an overflow tank there is some black soot residue showing like a skim coat at the top of the system.
Just some things to think about and put answers to in order to give the right direction.