Engine On Time

[TGTF]

Hello,

I'am Tom From the Netherlands and hav a problem with my car,

I have a Volvo 760 2.4 TD from 1984,
Last week i have replaced all the belt's and oil + filters, when i was done i want too start the engine but its not on time any more,
it runs but not on a proper way, and a lot of smoke some time's black some time's grey, is here some one who can tell me what the problem is and how i can fix t,

Greet's Tom,