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I have a 277b that was not working above an idle even throttled up. I put a bottle of Diesel 911 in and let it sit. The temps rose and I ran it for a few hrs. Seems fine now. The consenses among the mechanics at the local shop and the CAT mechanics is that there is H2O in the system. They say that the new low sulfur Diesel is a little wet and that the machines are having a hard time with that in the cold.
Try the 911 and also look to the water seperator.
I'm no mechanic though so take it for what it is worth.
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