The 4HK1 Crankshaft Main Bearing STD is a precision-engineered engine bearing set designed to support the crankshaft and maintain proper oil clearance in Isuzu diesel engines. These standard-size bearings are intended for engines with standard crankshaft journals that do not require undersize bearings.
Manufactured from high-quality bearing alloys, these main bearings provide excellent load-carrying capacity, wear resistance, and thermal stability under continuous heavy-duty operation. Proper main bearing condition is critical for maintaining crankshaft alignment, minimizing friction, and preventing catastrophic engine damage.
This bearing set is widely used in Isuzu N-Series trucks and industrial applications powered by 4HE1-TC, 4HK1-XS, 4HK1-TCN, and 4HG1 engines. It is suitable for engine overhauls, rebuilds, and preventive maintenance where OEM-level fit and durability are required.
✔ PRODUCT FEATURES
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Standard size (STD) crankshaft main bearing
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Precision machined for correct oil clearance
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High-strength bearing alloy construction
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Excellent fatigue and wear resistance
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Maintains crankshaft alignment and stability
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Designed for heavy-duty diesel engines
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OEM-equivalent fit and performance
✅ ENGINE COMPATIBILITY
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Isuzu 4HK1
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Isuzu 4HK1-TCN
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Isuzu 4HK1-XS
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Isuzu 4HE1-TC
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Isuzu 4HG1
✅ VEHICLE APPLICATIONS
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Isuzu N-Series trucks
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Medium-duty commercial vehicles
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Industrial and vocational diesel equipment
(Always confirm engine model and crankshaft journal size before installation.)
✅ KEY BENEFITS
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Ensures proper crankshaft support
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Reduces engine friction and vibration
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Promotes stable oil pressure
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Extends crankshaft and engine life
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Ideal for engine rebuilds and overhauls
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Reliable performance under continuous load
What does a crankshaft main bearing do?
Crankshaft main bearings support the crankshaft, maintain oil clearance, and allow smooth rotation under engine load.
What does STD mean on main bearings?
STD indicates standard size bearings used with crankshafts that have not been ground or machined undersize.
Which engines use this main bearing?
This bearing fits Isuzu 4HK1, 4HK1-TCN, 4HK1-XS, 4HE1-TC, and 4HG1 diesel engines.
When should crankshaft main bearings be replaced?
Main bearings should be replaced during engine overhaul or if low oil pressure, knocking noises, or bearing wear is detected.
