Smoke........old design engine, not built to emission standards of today's trucks, gets better when hot, things to check, air filter, injectors. Although Belgium may not have had MJ trucks, the Bedford TK would have been imported for the civilian market, so any info should be available, for the 330 Turbo engine. Where I worked, we rebuilt these engines and when they went though the test house facility, a smoke test was done, so there were standards to meet, but I am talking now of over 15 years ago.