Product Overview
The VI8941674701 4LE2 BRG CAP BOLT is a critical engine fastener for the Kobelco SK75-8 excavator equipped with the Isuzu 4LE2 diesel engine. This connecting rod bearing cap bolt secures the bearing cap to the connecting rod, ensuring proper clamping force on the connecting rod bearing and maintaining correct oil clearance for the crankshaft journal.
The Kobelco SK75-8 is a 7.5-ton class compact excavator widely used in construction, utility work, landscaping, and rental fleets . It is powered by the Isuzu 4LE2XCUA diesel engine, a 4-cylinder, 2.179-liter power unit producing 42 kW (56.3 hp) at 2,200 rpm . The 4LE2 engine utilizes an angle tightening method for the connecting rod cap bolts to further improve reliability and durability .
During engine operation, the connecting rod bolts are subjected to immense tensile forces with every combustion stroke. A failed or improperly torqued connecting rod bolt can lead to catastrophic engine failure, with the connecting rod separating from the crankshaft and potentially puncturing the engine block. This VI8941674701 bolt is manufactured to meet OEM specifications, providing the strength and reliability required for the Isuzu 4LE2 engine.
How the Connecting Rod Bolt Works
The connecting rod bolt performs a critical function in the engine’s bottom end assembly:
Function
The connecting rod bolt secures the connecting rod bearing cap to the connecting rod body. This clamping force holds the bearing shell in place and maintains the precise oil clearance between the bearing and the crankshaft journal.
Angle Tightening Method
The Isuzu 4LE2 engine utilizes an angle tightening method for the connecting rod cap bolts. This technique involves first torquing the bolt to a specified initial torque (typically 24 N·m / 18 lb·ft) , then tightening the bolt an additional specified angle of rotation. This method provides:
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More consistent clamping force across all bolts
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Improved reliability and durability
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Proper bolt stretch for optimal clamping
Single-Use Fastener
Connecting rod bolts in modern diesel engines like the 4LE2 are typically torque-to-yield fasteners. This means they are designed to stretch during the tightening process and must be replaced each time the connecting rod is removed or serviced. Never reuse old connecting rod bolts.
Key Features
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OEM Specification Compliance: Manufactured to meet the exact dimensional and material specifications required by Isuzu for the 4LE2 engine connecting rod assembly.
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Angle Tightening Design: Engineered specifically for the angle tightening method adopted for the 4LE2 connecting rod cap bolts to improve reliability and durability .
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High-Strength Material: Constructed from high-grade alloy steel capable of withstanding the extreme tensile forces generated during engine combustion cycles.
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Precision Threads: Machined to exact thread specifications for consistent clamping force and proper engagement with the connecting rod threads.
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Corrosion-Resistant Coating: Treated to resist rust and corrosion from engine oil and moisture exposure.
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Critical Safety Component: Properly functioning connecting rod bolts are essential for preventing catastrophic engine failure.
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Single-Use Replacement: Designed for one-time use only. Always replace with new bolts when servicing connecting rods.
Compatibility
This connecting rod bearing cap bolt is a direct replacement for the following application:
Excavator Model
Engine Compatibility
Part Number: VI8941674701
Also Known As: Conrod Bolt, Connecting Rod Bolt, Bearing Cap Bolt, Rod Bolt, BRG CAP BOLT
Related Fastener: 4LE2主轴承盖螺栓 (Main Bearing Cap Bolt) – different component
Please verify your engine model and connecting rod specifications before purchasing to ensure correct fitment.
When to Replace Connecting Rod Bolts
The VI8941674701 connecting rod bolts must be replaced in the following situations:
During Engine Rebuild
Whenever the engine is being overhauled and the connecting rods are removed, new connecting rod bolts must be installed. Never reuse old bolts.
After Catastrophic Engine Failure
If the engine has experienced a failure such as a thrown rod or bearing seizure, all connecting rod bolts should be replaced as part of the rebuild.
High Operating Hours
In high-hour engines being rebuilt preventatively, new connecting rod bolts are standard practice for bottom-end reassembly.
Connecting Rod Service
Any time the connecting rod bearing cap is removed for bearing inspection or replacement, new bolts must be used.
Technical Specifications
The Isuzu 4LE2 Workshop Manual provides the following specifications for connecting rod assembly:
Consequences of Bolt Failure
Benefits
Why choose our VI8941674701 Connecting Rod Bolt for your Kobelco SK75-8?
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Prevents Catastrophic Engine Failure: A failed connecting rod bolt can destroy the entire engine. Quality bolts prevent this costly outcome.
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Maintains Proper Bearing Clearance: Correct clamping force ensures the bearing shell remains properly positioned for optimal oil clearance.
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Essential for Engine Rebuilds: Any connecting rod service requires new bolts. This bolt provides the reliable fastening required for proper reassembly.
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Angle Tightening Compatible: Designed specifically for the 4LE2’s angle tightening method for optimal clamping force .
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Protects the Crankshaft: Proper bolt clamping prevents bearing spin that could damage the expensive crankshaft.
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Restores Engine Reliability: New bolts ensure the bottom end is assembled to factory specifications.
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OEM-Quality Assurance: Manufactured to meet or exceed original equipment standards for strength and durability.
Installation Guide
Connecting rod bolt replacement requires precise procedures. Refer to the Isuzu 4LE2 Workshop Manual for complete instructions.
Preparation
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Thoroughly clean the connecting rod and bearing cap threads
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Inspect the connecting rod for damage or stretching
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Lubricate bolt threads and undersides with clean engine oil
Angle Tightening Procedure
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Install the bearing cap with new bolts
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Tighten bolts to the initial torque specification: 24 N·m (18 lb·ft)
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Apply additional angle rotation as specified in the service manual (typically 90-120 degrees)
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Verify final torque angle using a protractor or angle gauge
Important Notes
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Do not use impact tools for final tightening
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Always follow the specified sequence if multiple bolts per rod
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Record final angle to ensure consistency across all cylinders
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Never reuse old connecting rod bolts
Why Choose Our VI8941674701 Connecting Rod Bolt?
We understand that the Isuzu 4LE2 engine in your Kobelco SK75-8 excavator is a precision-built diesel engine that requires quality components for reliable operation. The connecting rod bolt is one of the most highly stressed fasteners in the entire engine, subjected to thousands of pounds of tensile force with every power stroke .
Our VI8941674701 4LE2 BRG CAP BOLT is manufactured to strict quality standards, ensuring proper thread fitment, correct material strength, and consistent performance with the angle tightening method . Whether you are performing a complete engine overhaul, replacing a damaged connecting rod, or rebuilding the bottom end after a failure, this direct-fit connecting rod bolt provides the clamping reliability your Isuzu 4LE2 engine requires.
Technical Specifications Summary
Order your VI8941674701 4LE2 BRG CAP BOLT 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.
