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Well, the tractor had pry 20 hours on the same biodiesel blend before the knock appeared, so my guess is that the injectors just got a bit dirty.

Who knows, it may have gone away just by running the thing at PTO speed for a few hours on biodiesel anyway......

Most of my tractor work is not at a constant RPM. That may tend to cause injector coking.

L4300 DT with a knock
Kubota Tractors
Replies 6 Post by MannyT