Medium and Heavy Trucks
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I am sorry, I don't understand your question. I have never heard of timing the pistons.
I normal time the crankshaft to the camshaft and then the fuel system is timed at #1 TDC Compression Stroke.
The serial number you posted is not a CAT serial number. Also, your question is posted in the truck section. Is this a truck? CAT does not sell the 3412 for over the road use.
Please post back and help me understand what you are asking.