DEUTZ MWM 12420021 (Crankshaft Thrust Washer, STD)

1. Basic Information

• Part Number: 12420021 (OEM original part, standard thickness)
• Type: Thrust Washer (2 semi-circular pieces per set)
• Applicable Models: MWM TBG620 V12/V16/V20 and TBD620 series gas & diesel engines
• Material: Steel backing with babbitt alloy coating (same as main bearings), featuring excellent wear resistance and impact resistance
• Function: Restrict crankshaft axial play, bear axial thrust and keep the crankshaft in stable position
• Installation Position: Installed on both sides of the 4th main bearing, one piece on the top and one on the bottom
• Original Reference Price (2026): Approximately €85–95 per set (exclusive of tax)
• Related Parts:
  • 12420020 / 12420022: Matching main bearings
  • 12420024: Connecting rod bearing

2. Technical Parameters & Installation

• Standard Axial Clearance: 0.10–0.20 mm. Replace the washer if the clearance exceeds the specified range.
• Installation Direction: Place the grooved side against the thrust surface of the crankshaft, and the plain side against the cylinder block. Keep the locating tabs facing outwards.
• Common Failures: Alloy layer wear, peeling and ablation, which will cause excessive crankshaft axial movement, abnormal noise and severe vibration.
• Overhaul Interval: Replace together with main bearings and connecting rod bearings every 8000–10000 operating hours.