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Chris Newport
 
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wrote:
I have a big old Deutz engine installed in a 50 foot boat. Big old
Deutz 6FL714.


At 1800 nice pieces of black soot where flying out of both the exausts
.. and some black smoke too.

My idea is that running the engine at very light load "coked" the
engine. Is adding some "magic" additive in the diesel a good idea ? Or
better leave it as it is ?


This is normal for a 2 stroke diesel. You need to give it a blast at
full power every few hours.