That’s not good.
Does the white smoke disappear after the engine warms up? I am coming back to colour again as exhaust colour on a Diesel engine can tell you what’s going on. White smoke is unburnt/raw diesel coming out the exhaust. It can also be water. I haven’t seen any mention of using any coolant or the water alarm activating for the fuel filter. Has the water alarm been checked for correct operation?
Unburnt fuel is caused by;
Faulty injectors,
Timing issue,
Compression issue.
Your injectors have been bench tested and passed. As another member has mentioned, timing could be out. I am unsure as to what these engines use for timing. It could very well be out. If the engine uses a tone wheel, they can wear the keyway slot which allows the wheel to rotate, which then rotates slightly, putting the timing out. Or it could be that it has somehow skipped as somebody else said. I would think the computer would be able to pick this up, but not necessarily. Going down this path, I would hazard a guess isn’t easy and would cost a bit of money.
Compression, has a compression test be done or a leak down test? An easy way could be to remove the oil filler cap and see if there is a huge amount of blow by. This could be messy and could cause the oil cap to pop off when doing it. Or you could try to disconnect the pcv hose. I am of the opinion that there is a troublesome ‘T’ piece that’s easy to break. I would suggest checking blow by at cold and also hot. This will then allow you to check for differences between the two.
Please excuse me if this comes across as though I am being condescending. Just a person trying to send you down the correct path with fault finding. It can be very difficult over the internet. I’m not a Diesel mechanic, I am/was a Marine Engineer working offshore for 20 years. I have been working on Diesels for a long time. The engines I am used to, don’t have all the gear on them that modern automotive/high speed diesels do. But more modern vessels are definitely going that way.
Hopefully I have been able to help you a little direction.
Cheers.
