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Hi, my name is Kerry
Here is a link to parts diagrams.
Here is a link to a manual.
Black smoke is incompletely burned fuel, the engine is either getting too much fuel (leaking injectors) or not enough air (turbocharger problem).
Other possibilities are a clogged intercooler or low compression.
If the engine was fine before the servicing, you may have made the exhaust valves too tight.
If this was happening before the service, I would check the turbo.