Strange metal "clank" at cold start

[dazsa]

When I start my 81-300SD in the morning, it has a higher pitch metal clank (separate from the normal diesel clak) for about 10 seconds at random intervals. It does not do it again during the day upon warm restarting. I have not been able to narrow the origin down except to the engine or possibly the turbo area.

Is this anything to worry about or do I just have to wait to see if it gets worse to diagnose it?

Thanks,

Don