The injector wont be over fueling - the quanitity of fuel is the job of the fuel pump - but if the injector is not atomising the fuel correctly it might not be burning evenly, creating a potential hot spot. Testing an injector spray pattern...

New head gasket, get injectors checked/reconned and crack on, no pun intended! Cracks in the head between valves are not unusual on 200 engines, mine has had a cracked head for years, no leaks no coolant loss, keep on trucking. I think even my...

Thank you for the responses. It seems like there are lots of re-manufactured 300tdi cylinder heads but not nearly so much choice for 200's : this seems like an option...

Local heat buildup. If its one cylinder only then over fueling injector or blocked oil gallery in the piston crown are possible causes, with the latter only relevant if the 200TDI has oil cooled pistons. Local blockage in coolant gallery might...

Don't think you will get a new head, 2nd hand or reconditioned if available. Puff of black smoke is pretty normal on start up it would seem.

I am not an expert in this sort of internal engine diagnostics so wait for an adult to come along and give a proper answer. But over fueling can cause pistons to melt. So maybe an injectors issue on that piston if that’s the only one? Also as a...

Hello everyone, My first post. Just become a 1986 Ninety Owner in the last month and have been working on the 200tdi engine that has been a replacement for the petrol original. Had some "black smoke" on startup but engine very willing and keen...