What else can be the problem on a mitsubishi fuso 4D34 2005 model FE7-173 if the engine has been overalled and it still has no power and smokes alot

26.5Liters ODD FIRE.

https://www.emanualonline.com/trucks/mitsubishi-fuso.htm



buy the book,?
doing valve lash, i bet.

Question edited for clarity.
Question moved to maker category.

If you want the whole lot, you need a Service Manual. For odd parts, they are online. For example

year make model cylinder head torque.

https://www.google.com/search?q=Mitsubishi+Fuso.+I+need+a+torque+specs+of+Fuso+engine+8M21

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Mitsubishi Fuso Super Great no year told , near 13 LITER DIESEL
try testing the glow plugs all work.
filers all clean
fuel not old or with water contamination./
Power: 320 PS / 2.000 rpm Torque: 1.275 Nm / 1.100 rpm Displacement: 12.882 cc Cylinders: I-6 Bore x Stroke : 135 x 150mm Aspiration: Turbocharged + Intercooler

T1 TO T7 SUFFIX ON ENGINE, NOT TOLD.

That isn't the way you buy them. Not by length but for 'year make model engine'

https://www.ebay.ca/b/Belts-Pulleys-Brackets-for-Mitsubishi-Fuso-FE/262059/bn_1453199

https://www.google.com/search?q=Mitsubishi+Fuso+4D33+serpentine+belt

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Question edited for clarity and our preffered format of year make model first.

White smoke is steam. Check if your coolant is going down. Or, there is actually water in gasoline at molecular lever which is burnt off and condenses as it exits the exhaust. It is particularly noticable at this time of year as the weather gets cooler. After a good run, it should be less noticable.

Some Preview diagrams here but really, you need a Service Manual

https://www.google.com/search?q=Mitsubishi+Canter+FUSO+4p10+engine+starter+circuit

Service Manuals

https://www.pdfmanual4trucks.com/mitsubishi/

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For heavy machinery cars etc. luckily there are many websites
that can help you repair
for eg site like reliable-store is very a ctive in this.. instant help, emails and all that's fantastic

I need to wiring diagram ecu pinout for fuso super great to engine 6m70t3

for better result download the pdf file

Mitsubishi Fuso Canter Truck Workshop Repair Manual

You missed a seal on the turbo. Or the turbo is bad. Everything else you did would only make it smoke bad if you missed something.