This is a piston assembly used in the Shaanxi Auto Delong series heavy-duty trucks.

Detailed Analysis:

1. Product Positioning & Application

• Applicable Models: Mainly fits diesel engines in Shaanxi Auto Delong F3000, F2000, M3000, X3000, L3000 series heavy-duty trucks, as well as other commercial vehicle models under Shaanxi Auto. Compatible engine series include Weichai WP series, Cummins ISM series, SFH Cursor series, etc.

2. Replacement Interval

• Affected by fuel quality, operating conditions (heavy load, low speed, frequent start-stop). Generally recommended to inspect piston wear (e.g., piston ring misalignment, skirt scoring, crown erosion) every 100,000–150,000 km or during engine overhaul. Replace as a set if necessary.

3. Compatibility

• Different Shaanxi Auto Delong models use different engines (e.g., WP10, WP12, ISM11), with variations in piston dimensions (bore diameter, compression height), ring groove count/size, and piston crown shape. Strict selection according to engine model is required to avoid mismatched installation that could lead to insufficient cylinder pressure, oil burning, or power loss.