vi8980890840 Crankshaft Bearing

Product Overview

The VI8980890840 Crankshaft Bearing Set is a critical engine component for the Kobelco SK75-8 excavator equipped with the Isuzu 4LE2 diesel engine. This main bearing set, also known as a crankshaft bearing kit or main bearing set, provides the precision bearing surfaces that support the crankshaft and allow it to rotate smoothly within the engine block.

The Kobelco SK75-8 is a 7.5-ton class compact excavator powered by the Isuzu 4LE2XCUA diesel engine, a 4-cylinder, 2.179-liter direct injection engine with turbocharger and intercooler producing 42 kW (56.3 hp) at 2,200 rpm . The 4LE2 engine series is known for its durability and reliability, but like all internal combustion engines, it requires proper maintenance and timely replacement of wear components like crankshaft bearings during overhaul.

This bearing set reduces friction between the crankshaft main journals and the cylinder block while maintaining a proper oil film on sliding surfaces . It is an essential component for any comprehensive engine rebuild or bottom-end overhaul.

Critical Functions of the Crankshaft Bearing

The VI8980890840 Crankshaft Bearing performs several essential functions within your Isuzu 4LE2 engine:

• Crankshaft Support: Provides precision bearing surfaces that support the crankshaft journals, allowing the crankshaft to rotate at engine speed.

• Friction Reduction: Reduces friction between the rotating crankshaft journals and the stationary engine block, minimizing power loss and wear .

• Oil Film Maintenance: Precision-machined bearing surfaces retain a thin film of engine oil that separates the crankshaft journal from the bearing, preventing metal-to-metal contact .

• Load Distribution: Evenly distributes the immense forces generated during combustion across the bearing surface.

• Crankshaft Protection: Serves as a sacrificial wear surface, protecting the more expensive crankshaft from damage.

• Oil Clearance Management: Maintains the precise oil clearance specified for the 4LE2 engine, ensuring proper lubrication.

Key Features

• OEM Specification Compliance: Manufactured to meet the exact dimensional and material specifications required by Isuzu for the 4LE2 engine.

• Complete Bearing Set: Includes all necessary main bearings for a full engine rebuild.

• High-Grade Bearing Material: Constructed from premium bearing material with excellent wear resistance and fatigue strength.

• Precision Tolerances: Machined to exact dimensional specifications for proper oil clearance.

• Cross-Compatible: Compatible with Isuzu 4LE1 and 4LE2 engines .

• Direct Replacement: Designed for straightforward installation following OEM procedures.

• TAIHO Quality: Manufactured to TAIHO bearing specifications for reliable performance .

Compatibility

This crankshaft bearing set is a direct replacement for the following applications:

Excavator Model

• Kobelco SK75-8

Engine Compatibility

• Isuzu 4LE1 Diesel Engine 

• Isuzu 4LE2 Diesel Engine 

• Isuzu 4LE2XCUA (SK75-8 specific variant) 

Equipment Applications

• Hitachi excavators with 4LE2 engines 

• JCB equipment with 4LE2 engines 

• Case equipment with 4LE2 engines 

Part Number: VI8980890840

Cross Reference Numbers: 8-98089084-0, 898089-0840, 8971412100, 02/803140 

Also Known As: Main Bearing Set, Crankshaft Bearing Kit, Engine Bottom End Bearings, Crank Journal Bearings

Please verify your engine model and current bearing part number before purchasing to ensure correct fitment.

Crankshaft Bearing Installation Overview

According to the Isuzu 4LE2 Workshop Manual, proper crankshaft bearing installation requires attention to detail :

Upper and Lower Bearings

The upper and lower crankshaft bearings are different:

• Upper bearing: Has oil holes and oil grooves for lubrication

• Lower bearing: Does not have oil holes or oil grooves – be careful when assembling 

Installation Steps

1. Clean the crankshaft bearing and bearing housing using a shop cloth 

2. Verify no foreign material on the back side of the bearing or bearing housing 

3. Install the crankshaft bearing to the cylinder block, ensuring the bearing claw fits securely into the notched section 

4. Apply engine oil to the crankshaft bearing sliding surface 

5. Install the thrust bearing to the No. 2 journal section with the oil groove facing outward 

6. Align bearing cap with the front mark and install 

7. Apply engine oil to bolt threaded portions and seat surfaces 

8. Tighten bolts gradually and uniformly in the specified order 

Thrust Washer Information

The 4LE2 engine also uses thrust washers for crankshaft end play control. These are typically installed at the No. 2 journal section with the oil groove facing outward . For reference, thrust washers for 4LE1/4LE2 engines are available as separate components .

Signs Your Crankshaft Bearings Need Replacement

The crankshaft bearings are subject to wear over thousands of operating hours. Replace your VI8980890840 bearings if you observe:

1. Low Oil Pressure: Worn main bearings increase internal clearances, causing a drop in oil pressure, especially at idle or when the engine is hot.

2. Deep Knocking Noise: A low-pitched, rhythmic knocking sound from the bottom of the engine that increases with engine RPM indicates worn main bearings.

3. Metal Particles in Engine Oil: Fine metal particles in the engine oil indicate bearing material wear.

4. Engine Vibration: Excessive bearing clearance can cause crankshaft imbalance and unusual engine vibration.

5. During Engine Overhaul: When performing a complete engine rebuild, crankshaft bearings should always be replaced with new ones.

6. High Operating Hours: Proactive replacement during major engine service intervals prevents unexpected failures.

Benefits

Why choose our VI8980890840 Crankshaft Bearing Set for your Kobelco SK75-8?

1. Restores Oil Pressure: New bearings restore proper crankshaft clearances, bringing oil pressure back to OEM specifications.

2. Prevents Catastrophic Engine Failure: Worn main bearings can lead to crankshaft damage or complete engine seizure. Quality bearings prevent this costly damage.

3. Eliminates Bottom-End Knocking: New bearings eliminate knocking sounds and restore smooth engine operation.

4. Extends Engine Life: Quality main bearings protect the crankshaft and engine block, allowing your 4LE2 engine to run for thousands more hours.

5. Essential for Complete Overhaul: Any comprehensive 4LE2 engine rebuild must include new main bearings for reliable long-term operation.

6. Protects the Crankshaft: Serves as a sacrificial component, protecting the expensive crankshaft from damage.

7. OEM-Quality Assurance: Manufactured to meet or exceed original equipment standards for reliable performance.

Measuring Bearing Clearance

The Isuzu 4LE2 Workshop Manual specifies using plastigauge to measure bearing clearance :

Plastigauge Types

• PG-1 (Green): Measurable range 0.025 to 0.076 mm {0.00098 to 0.00299 in}

• PR-1 (Red): Measurable range 0.051 to 0.152 mm {0.00201 to 0.00598 in}

• PB-1 (Blue): Measurable range 0.102 to 0.229 mm {0.00402 to 0.00902 in} 

Measurement Procedure

1. Clean bearing surfaces and install bearings

2. Cut plastigauge to journal width, lay parallel avoiding oil holes

3. Install bearing cap and tighten to specified torque

4. Do not move crankshaft while plastigauge is in use 

5. Remove cap and measure flattened plastigauge width using the scale on the packaging

Why Choose Our VI8980890840 Crankshaft Bearing?

We understand that the Isuzu 4LE2 engine in your Kobelco SK75-8 excavator is a precision diesel engine that requires quality components for reliable operation. The crankshaft bearings are among the most critical components in the engine bottom end.

Our VI8980890840 Crankshaft Bearing Set is manufactured to strict quality standards with precise dimensional tolerances and premium bearing materials . According to cross-reference information, this bearing set is compatible with multiple 4LE series engines and various equipment brands, ensuring broad application coverage .

Whether you are performing a complete engine overhaul, addressing low oil pressure issues, or stocking critical spares for fleet maintenance, you can trust this crankshaft bearing set to deliver the precision and durability your Isuzu 4LE2 engine requires.

Technical Specifications

Order your VI8980890840 Crankshaft Bearing Set today and ensure proper bottom-end assembly for your Kobelco SK75-8 excavator’s Isuzu 4LE2 engine. In stock and ready for immediate worldwide shipping. Bulk pricing available for engine rebuild kits and fleet maintenance.