Cummins ISF2.8 Main Bearing & Connecting Rod Bearing Set | | OEM Size

Product Details

Product Overview

This precision engineering set includes both the main bearing and connecting rod bearing components specifically designed for the Cummins ISF2.8 diesel engine. Manufactured under the brand, this bearing set is engineered to meet OEM size specifications, ensuring a precise fit for your engine rebuild or maintenance project.

Commonly used in a wide range of applications including construction machinery, agricultural equipment, industrial generators, marine propulsion, and material handling vehicles, these bearings are critical for maintaining proper crankshaft clearance and oil film thickness. The set provides the necessary components for a complete lower-end engine overhaul on ISF2.8 series power units.

Each bearing is manufactured to strict tolerances, offering a reliable replacement solution for workshop maintenance, engine rebuilders, and equipment fleet managers seeking to restore factory performance and longevity.

Key Features & Benefits

• OEM Specification Fitment: Manufactured to original equipment manufacturer size standards, ensuring direct bolt-in compatibility without modification or adjustment.
• Complete Bearing Set: Includes both main bearings and connecting rod bearings in one package, simplifying parts ordering and inventory management.
• Durable Material Construction: Designed to withstand the high loads and thermal stresses typical of turbocharged diesel engine operation.
• Critical Clearance Control: Precision-ground surfaces provide optimal oil clearance, supporting proper lubrication and reducing wear on crankshaft journals.
• Extended Engine Life: High-quality bearing materials help prevent premature engine failure caused by bearing fatigue or spin.
• Versatile Application Range: Suitable for multiple equipment types including excavators, loaders, generators, and agricultural tractors powered by the ISF2.8 engine.
• Reliable Aftermarket Solution: Provides a cost-effective alternative to genuine parts while maintaining quality standards and performance expectations.

Technical Specifications

OEM Cross-Reference

This bearing set is designed as a direct replacement for the following OEM part numbers. Please verify your existing part number before ordering:

• Cummins OEM: 3977392, 3977393, 3977394, 3977395
• Main Bearing Set Reference: 3977392 (Upper), 3977393 (Lower)
• Connecting Rod Bearing Reference: 3977394 (Upper), 3977395 (Lower)
• Alternative Sets: Compatible with ISF2.8 engine rebuild kits requiring standard size bearings

Note: Cross-reference numbers are provided for identification purposes. Always confirm compatibility by comparing the original part markings.

Compatibility

This bearing set is commonly used for the following engine and equipment applications:

• Engine Models: Cummins ISF2.8 (all variants including ISF2.8s4129P, ISF2.8s4148T, ISF2.8s4161P)
• Vehicle & Equipment Applications:
  • Construction: Small excavators, mini loaders, compactors
  • Agriculture: Tractors, harvesters, sprayers
  • Industrial: Generator sets, compressors, pumps
  • Marine: Auxiliary engines, small workboats
  • Material Handling: Forklifts, telehandlers

Important: OEM size bearings are intended for use with standard crankshaft journals. If the crankshaft has been previously ground, undersize bearings may be required. Always measure journal dimensions before installation.

Global Supply & Distribution

We offer worldwide shipping capabilities to support international buyers across all major markets. Our distribution network ensures efficient delivery to:

• North America: Regular shipments to ports in Los Angeles, Houston, New York, Vancouver, and Toronto
• Europe: Express delivery to Rotterdam, Hamburg, Antwerp, and major inland industrial centers
• Asia-Pacific: Fast shipping to Singapore, Dubai, Sydney, and Southeast Asian markets
• Middle East & Africa: Reliable service to Jebel Ali, Dammam, Durban, and Lagos
• South America: Coverage to Santos, Buenos Aires, and Valparaíso

With extensive export experience and compliance with international trade standards, we provide secure packaging, accurate documentation, and competitive freight options for both air and sea cargo.

Quality Assurance

Each bearing set undergoes rigorous quality control processes to ensure reliable performance in demanding diesel engine applications:

• Manufacturing Standards: Produced in ISO 9001 certified facilities with modern CNC machining and grinding equipment
• Testing Procedures: Dimensional inspection, surface finish verification, and material hardness testing on every production batch
• Inspection Support: Machinery test reports and outgoing video inspection are available upon request
• Warranty Coverage: Backed by a 6-month warranty against manufacturing defects in materials and workmanship
• Traceability: Each bearing set is batch-coded for complete production traceability

FAQ

Q1: How do I confirm these bearings fit my specific ISF2.8 engine?

First, verify your engine model plate shows “ISF2.8” series. Remove one main bearing cap and one connecting rod cap to check the existing bearing size marking. Standard OEM size bearings are suitable if the crankshaft journals show no signs of scoring or wear beyond specification. For rebuilt engines with reground crankshafts, you will need undersize bearings (typically 0.25mm or 0.50mm). Always measure journal diameters with a micrometer before ordering.

Q2: What is the correct installation procedure for these bearings?

Clean all bearing surfaces and crankshaft journals thoroughly with solvent. Apply clean engine oil to the bearing surfaces before installation. Ensure bearing shells are seated properly in their housings with the locating tang engaged. Torque main bearing caps and connecting rod caps to Cummins ISF2.8 factory specifications (typically 90-100 Nm for main bolts and 50-60 Nm for rod bolts, plus angle tightening where specified). Always use a torque wrench and follow the correct tightening sequence.

Q3: What maintenance practices extend bearing life in ISF2.8 engines?

Use high-quality diesel engine oil meeting Cummins CES 20074 or API CJ-4/CH-4 specifications. Change oil and filter at intervals not exceeding 250 hours or as recommended by the equipment manufacturer. Maintain proper coolant temperature to prevent thermal stress. Avoid prolonged idling and ensure the engine reaches operating temperature before applying heavy loads. Regularly check oil pressure at the gauge – any sudden drop indicates potential bearing wear requiring immediate inspection.