BorgWarner 4981551 Turbocharger K03 Assembly

This BorgWarner K03 frame turbocharger assembly serves as a direct OEM replacement for Caterpillar part number 4981551. It is designed for the Caterpillar C3.4B diesel engine utilized in XQ60 generator set applications. The unit features a water-cooled center housing rotating assembly (CHRA) with journal bearings and a pneumatic wastegate actuator for boost control. The turbine housing is constructed from high-temperature cast iron alloy. The compressor stage utilizes an extended-tip wheel design for improved efficiency at target pressure ratios. This turbocharger integrates the exhaust manifold in a single casting for compact installation on the C3.4B power unit. Technical specifications align with BorgWarner K03 series standards for light commercial and industrial diesel engines up to 3.0 liters displacement, adapted for the 3.4L C3.4B operating at constant speed generator duty cycles. Installation requires verification of oil feed/return lines and coolant circuit connections per Caterpillar service guidelines.