Flywheel Housing 4917573 Fits Cummins

The Flywheel Housing 4917573 is an OEM-grade component engineered for Cummins' high-horsepower engines, including the K38 (38 L, 1,300–2,100 hp), K50 (50 L, 2,200–3,500 hp), and QSK60 (60 L, 3,500–4,000 hp). Serving as the structural interface between the engine block and drivetrain, it ensures zero misalignment under 2,000 N·m torque and 20g vibrations, preventing over $100,000 in damage from gear failure or oil leaks. Constructed from high-strength cast iron (ASTM A48 Class 50) with a plasma-sprayed ceramic coating, it withstands 1,000 hours of salt spray (ASTM B117) and 10 million fatigue cycles (ISO 6336), outlasting aftermarket housings by four times.

Triple-Layer Construction

- Base Material: ASTM A48 Class 50 cast iron (345 MPa tensile strength) resists 99.9% of abrasive wear in mining environments.

- Surface Coating: Plasma-sprayed alumina (Al₂O₃, 0.2 mm thick) reduces friction to μ ≤0.10 under 800 MPa contact stress.

- Sealing Technology: Laser-welded Viton® O-ring (90 Shore A) maintains 100% oil retention from -40°C to 150°C.

OE-Level Geometry

- 3D-Ribbed Structure: Reduces vibration transmission by 40%, extending gear life.

- Laser-Cut Alignment Pins: Ensure 0.01 mm installation precision with K38/K50/QSK60 engine blocks.

Tested to Cummins' Extremes

- Fatigue Life: 10 million cycles at 2,100 rpm (ISO 6336).

- Leak Test: Helium leak rate <5×10⁻⁹ mbar·L/s (ISO 20488).

Part Number : 4917573 (Rev. L, 2025 revision)

Compatibility : Cummins K38/K50/QSK60 engines

Max Torque Rating : 2,000 N·m (1,475 ft-lb) continuous

Vibration Resistance : 20g at 2,000 Hz (ISO 10816-3)

Material : ASTM A48 Class 50 cast iron + Al₂O₃ coating

Dimensions : φ1,000 mm OD × 200 mm width

Weight : 85 kg (187.4 lbs)

Life Certification : 25,000-hour bench test (50,000 mining hours) – TÜV SÜD certified

Surface Hardness : HRC 45–50 (sealing surface)

Critical Installation Steps:

1. Surface Preparation: Use Cummins cleaner P/N 4922479 to achieve a 0.8 μm Ra finish on the engine block.

2. Torque Sequence: Tighten to 450 ±5 N·m (332 ft-lb) in three incremental steps using Cummins tool JH42879.

3. Runout Check: Verify radial runout ≤0.05 mm with a dial indicator.

Maintenance Schedule:

- Every 2,000 Hours: Inspect visually for coating delamination (replace if loss exceeds 5%).

- Every 5,000 Hours: Perform ultrasonic thickness test (minimum thickness: 198 mm).

- Lubrication: Apply high-temperature grease P/N 159499 to mating surfaces every 10,000 hours.