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Tri-Metal Cummins Engine Bearings for N14, ISX15 & KTA Series

Load-Bearing Precision: Main & Rod Shells for Heavy-Duty Diesel Crankshafts

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Quick Summary: Cummins Engine Bearing Solutions

Restore engine reliability with high-performance Cummins main and rod bearings. Designed to prevent bearing shell fatigue and oil starvation scoring in ISX15, N14, and 6BT applications. Fits heavy-duty equipment including Peterbilt 389, Komatsu PC300, and Case 580. Standard and oversized options in stock.

Friction Management: Precision Engine Bearings for High-Torque Applications

In the high-torque environment of heavy-duty trucking and industrial power generation, the bearing shell is the critical interface protecting the crankshaft. Ruich Value resolves critical maintenance shortages with a wholesale inventory of Cummins Engine Bearings, specifically engineered to withstand massive firing pressures. Whether you are rebuilding a legendary N14 for a long-haul truck or overhauling a KTA19 for a marine vessel, our catalog offers the metallurgical precision required to prevent seizure and spin. Cummins engines are renowned for longevity, but rebuilds are inevitable. Our inventory focuses on Tri-Metal (Copper-Lead) technology, ensuring superior fatigue strength and embeddability compared to standard bi-metal aluminum parts. From Standard (STD) to .030″ Oversize configurations, we provide the essential Main and Rod Shells needed by machine shops to save crankshafts and restore factory oil clearance tolerances.

Buyer’s Guide: Types of Cummins Bearings & Bushings

Component Type Market Aliases Critical Function
Main Bearing Set Main Shells, Crankshaft Bearings, Mains Supports the crankshaft within the block. Critical for oil pressure retention.
Con Rod Bearing Set Big End Bearings, Rod Shells Connects the piston rod to the crankshaft throw. Subject to the highest impact loads.
Camshaft Bushing Cam Bearings, Cam Bushes Supports the camshaft. Essential for ISX15 (overhead cam) and older cam-in-block engines.

Cummins Engine & Equipment Applications

Engine Series Compatible Vehicles & Machinery
Mid-Range (B/C Series)
  • 4BT, 6BT (5.9L) – Dodge Ram, Excavators
  • 6CT, ISC (8.3L) – Buses, Trucks
  • ISB, QSB – Industrial Loaders
Heavy Duty (N/M/ISX)
  • N14, M11 – Legacy Trucks
  • ISX15, QSX15 – Freightliner, Kenworth
  • L10 – Transit Buses
High Horsepower (KTA)
  • KTA19, KTA38, KTA50
  • Marine Propulsion, Mining Haul Trucks
  • Power Generation Sets

Why Source Cummins Engine Bearings from Ruich Value?

  • Tri-Metal Construction: We utilize a premium Steel-Copper-Lead-Tin layering process (Tri-metal) for heavy-duty applications. This provides superior load-carrying capacity compared to cheaper bi-metal aluminum bearings.
  • Precision Crush Height: Our bearing shells are manufactured with exact “crush” specifications to ensure they seat firmly in the housing, preventing “spun bearings” under high RPM.
  • Overlay Plating: A soft lead-tin overlay allows for excellent “embeddability,” absorbing microscopic debris in the oil to protect your expensive crankshaft journals from scoring.
  • Oversize Availability: We stock bearings in Standard (STD), .010″ (0.25mm), .020″ (0.50mm), and .030″ (0.75mm) sizes, supporting machine shops that grind crankshafts to extend their life.
  • Complete Sets: Our bearings are boxed in engine sets (e.g., 6 pairs for a 6-cylinder rod set), simplifying inventory management for parts distributors.

Compatible Equipment Models

Our Cummins engine bearing sets are engineered for equipment including: Peterbilt 389 trucks, Komatsu PC300-8 excavators, Kenworth T800, Shantui SD16 dozers, and Case 580 series.

Available Cummins Engine Bearing Range

Explore our comprehensive catalog of replacement Main Shells and Rod Bearings. If you require specific undersize dimensions, please verify with our sales team.
Engine ModelItem NamePart No.
6BT / EQBT (5.9L)Main Bearing3929016, 3929021, 3901150, 3901306, (3802070 set), 3927772, 4892114/4892715
B Series (3.9L/4.5L) / QSBMain Bearing3978818 / 3978820 / 3978822 (Set), 3977272
B Series (3.9L/4.5L) / QSBConnecting Rod Bearing3969562, 4893693
EQBTACAM Bushing3971970, 3901090, 3901170
4BTA390Connecting Rod Bearing3901170, 3941476
Cummins C (8.3L)Main BearingMain Bearing3944158 / 15/1163, 3945917
Cummins C (8.3L)Connecting Rod Bearing3950661, 3917430 (Standard)
Cummins C (8.3L)Flanged Bearing3944163
Cummins C (8.3L)CAM Bearing3943199, 3945329
Cummins C (8.3L)CAM Bushing3913990
Cummins L (10L)Main Bearing3901590, 3919840, 3926798
Cummins L (10L)Connecting Rod Bearing3966344 / 3950661
Cummins D (B Series)Flanged Bearing3978822 / 24 (Thrust Washer Set)
ISDe (Cummins Renault D)CAM BearingD4889112
ISDe (Cummins Renault D)CAM BushingD4890059
ISDe (Cummins Renault D)Rod BearingD4893637
Dongfeng Renault (DCI11)Main BearingD5010295445 (Upper), D5010295446 (Lower)
Dongfeng Renault (DCI11)Connecting Rod BearingD5010359940 (Upper), D5010477479 (Lower)
Dongfeng Renault (DCI11)Thrust WashersD5010295448 / D5010295447
QSZ(ISZ)13Main Bearing4999939 (Upper), 4999940 (Lower)
QSZ(ISZ)13Connecting Rod Bearing4999948 (Upper), 4999949 (Lower)
FOTON CUMMINS (3.8L)Main Bearing4948505/4948506
FOTON CUMMINS (3.8L)Flanged Bearing (Upper/Lower)4948507/4948508
FOTON CUMMINS (3.8L)Connecting Rod Bearing (Upper/Lower)4948509/4949510
FOTON CUMMINS (2.8L)Main Bearing (Upper/Lower)4996250/49966251
FOTON CUMMINS (2.8L)Flanged Bearing4946031
FOTON CUMMINS (2.8L)Connecting Rod Bearing5261124 / 5284535 / 5340181 / 5348887 / 5261125 / 5284537 / 5340182
NT855 (13L/15L)Main Bearing3801260
NT855 (13L/15L)Connecting Rod Bearing214950
NT855Thrust Washers (Small Hole)203660
N14 (NT743/NH220)Thrust Washers3020557
N14 (NT74)Main Bearing3801260
M11 (LT10)Main Bearing3016770 (Upper), 3016780 (Lower)
M11 (LT10)Thrust Washers3016760 (Set), 4025125 (Without Flange)
KTA(QSK)19Main Bearing3016760, AR12270A
KTA(QSK)19Connecting Rod Bearing205840
KTA(QSK)19Thrust Washers205112
KTA(QSK)38 / KTA(QSK)50Main Bearing3018210 (Standard Set), AR12250
KTA(QSK)38 / KTA(QSK)50Connecting Rod Bearing3042390
KTA(QSK)38 / KTA(QSK)50Thrust Washers3000139
QSX(ISX)15Main Bearing3678555 (Upper), 3678556 / 3800298 (Upper), 4089139 / 4089405 (Lower)
QSX(ISX)15Connecting Rod Bearing4925971
QSX(ISX)15Thrust Washers4925975

Detailed View: Select a specific item below to view detailed technical specifications, OEM cross-reference data, and high-resolution physical photos.

Looking for more components? Explore our complete Cummins Heavy Duty Diesel Engine Parts Catalog

Technical Q&A: Cummins Engine Bearings

What is the most common cause of Cummins bearing fatigue?

Bearing fatigue is often caused by long-term high-load operation exceeding the material limit. This results in microscopic cracks in the bearing shell, eventually leading to material detachment and oil pressure loss.

Why are tri-metal bearings critical for Cummins heavy-duty engines?

Tri-metal bearings utilize a steel back for strength, a copper-lead intermediate layer for load capacity, and a thin babbitt overlay for surface embeddability, providing the necessary balance between hardness and protection.

How do I determine if I need standard or oversized bearings?

Oversized bearings (e.g., +0.25mm) are strictly required if the crankshaft journals have been reground to a smaller diameter. Installing standard bearings on reground journals will cause fatal oil clearance issues.

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