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Caterpillar forged steel crankshaft S4K

S4K crankshaft, we suggest to choose forged steel one because it has stable quality. Casting S4K crankshaft is less than half the price. But it may cause seizure, its counterweight may collide with cylinder block. Part numbers: 4W3579, 5I5610, 5I5611, 5I7844, 1352419

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