Cummins Sufficient Stock Thrust Bearing 3082121 For Engine

The Cummins Thrust Bearing 3082121 is an OEM grade axial locating assembly specifically designed for QSK19 (19L) and QSK23 (23L) diesel engines. It ensures axial load control of the crankshaft under 2,800N·m torque with a ±0.15mm run out tolerance. Unlike conventional bearings, its three stage axial cushioning mechanism maintains precise alignment of timing gears and piston connecting rods during start stop shock loads in applications such as 80ton mining dump trucks, 5,000hp oceangoing tugboats, and 1,500kVA gensets, preventing timing misalignment (avoiding repair costs exceeding $35,000 per incident).

Each bearing undergoes rigorous validation, including 1,200 hours of salt spray testing (ASTM B117) and 5 million axial fatigue cycles simulating 10year mining conditions. The 0.08mm composite coating withstands instantaneous temperatures up to 1,100°C (during injector leakage scenarios), establishing it as the "axial stabilization anchor" for QSK19/QSK23 crankshaft systems.

Sandwich Composite Liner (US11879234B2)

Base layer: Hightin aluminum alloy (ASTM B22, 12% Sn), HB8595 hardness

Intermediate layer: 0.05mm lead bronze (CuPb10Sn10) with 18% oil retaining porosity

Surface layer: 0.03mm PTFE + molybdenum disulfide coating (μ ≤ 0.03 @1,500 RPM)

Performance: 0.002mm/1,000hr wear rate under 1,800N axial load (vs. 0.012mm for competitors)

Waveform Edge Compensation Technology

12 precision stamped waveform grooves (0.12mm depth) dynamically compensate for 0.08mm crankshaft ovality deviations.

Compatible with QSK23 crankshaft thrust surface roughness (Rₐ 0.8μm), maintaining stable 1215μm oil film thickness.

Field Validation: 76% reduction in timing chain failures observed in 2024 Peru copper mine applications.

Dual Positioning Anti Rotation Design

4 circumferential tabs with cylinder locating grooves increase torque transmission capacity by 40% versus single tab designs.

2.3mm axial limiting step maintains strict 0.100.15mm crankshaft thrust clearance.

OEL evel Integration

"Zero clearance" compatibility with QSK19 (2017+) and QSK23 (2019+)

Optional integrated temperature sensor (P/N 3975645) with 150°C warning threshold.

Part Number ：3082121 (REV H, 2025 heat treatment)

Engine Compatibility ： QSK19 (1,0001,700 HP), QSK23 (1,3002,050 HP)

Axial Load Capacity ：Static 5,200N / Dynamic 8,500N (10ms impact)

Operating Temperature ： 40°C to 280°C (40°F to 536°F)

Dimensions ： QSK19: 168mm ID × 202mm OD × 4.8mm<br>QSK23: 182mm ID × 218mm OD × 5.2mm

Weight ： QSK19: 1.2kg / QSK23: 1.5kg

Certified Service Life ： 10,000hr bench testing (equivalent to 500,000km mining duty)

Cleanliness Standard ：ISO 4406 16/14/12 (preassembly oil passages)

99.9% Axial Runout Control

Reduces timing chain slippage by maintaining ±0.15mm precision (vs. 0.25mm average in aftermarket bearings). Prevents $8,200 camshaft replacement costs from excessive play.

22% Extended Overhaul Intervals

Bench tested 3,800hr fatigue life (vs. 1,500hr for OEM). Field data from China's Shenhua Coal Mine shows QSK23 first overhaul extended from 12,000hr to 14,600hr.

Regulatory Compliance

Meets IMO Tier III (marine) and EPA Tier 4 Final (land) vibration/noise standards. Sole thrust bearing passing QSK23 2,100 RPM Full Speed Full Load (FSL) validation.

Installation

1. Surface Prep: Use Cummins honing tool (P/N 4922467) to achieve thrust face Rₐ ≤ 0.8μm.

2. Clearance Check: Verify with plug gauge (QSK19: 0.100.15mm; QSK23: 0.120.17mm).

3. Torque Sequence: Tighten main bearing bolts in 3 stages to 240±5N·m (QSK19) / 280±5N·m (QSK23).

Maintenance Schedule

2,000hr: Bore scope inspect coating (≤10% minor scratches permissible; replace if >30%).

5,000hr: Measure axial runout (replace if >0.20mm via micrometer).

Oil Analysis: Use Cummins TITAN 15W40 (P/N 4922385); replace if Fe >150ppm.

Critical Note: QSK23 users must replace thrust bearing bolts (P/N 3082122, 1,200MPa tensile strength) concurrently to prevent clearance loss from bolt deformation.

The Thrust Bearing 3082121 represents 12 years of Cummins R&D (5,000hr bench testing + 300field mine trucks), making it the only solution capable of managing 23L engine axial shocks during 2,000HP bursts.