Weichai Cylinder Head Assembly 1004720477 – Complete Engine Head for WP13, WP12 Diesel Engines

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Before installing the Weichai cylinder head (1004720477), clean the engine block surface thoroughly and inspect for warpage or cracks using a straight edge. Always use a new head gasket and new stretch-type head bolts — reusing old bolts can lead to uneven clamping force and head gasket failure. Tighten in the correct sequence and torque stages as specified in the Weichai service manual (typically: 50 Nm → 100 Nm → final angle tightening). After installation, refill coolant, bleed air from the system, and run the engine at idle before loading.