What is the 129-1351 unit injector?
What the 129-1351 Is
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Part Number: 129-1351 (also referenced as 1291351, and cross-references like 0R-9943, 20R-2054).
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Component Type: Fuel injector / fuel valve nozzle — the component that injects diesel fuel into the engine’s combustion chamber under high pressure.
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Role: It’s essentially the injector nozzle (fuel valve) that works within the engine’s fuel injection system to atomize and deliver fuel into each cylinder for combustion.
Can a bad injector damage the engine?
Yes — a bad injector can definitely damage an engine, especially on diesel engines used in heavy equipment and trucks.
Below is a clear, practical explanation
