Product Descreiption
1. Product Basic Parameters
- Part Number: 4089804
- Product Name: Connecting Rod Bearing / Conrod Bearing
- Material Composition:
- Back substrate: Low-carbon steel backing plate (high structural strength, anti-deformation)
- Friction surface: Bimetallic tri-alloy layer (aluminum-tin alloy or copper-lead alloy), good wear resistance & load-bearing capacity
- Structural Type: Split half-shell bearing (two matching semi-circular pieces per set)
- Matching Feature: With locating tang (anti-rotation positioning lug) to fix position inside connecting rod big end
- Tolerance Standard: Precision micron-level machining clearance, matched to crankshaft connecting rod journal
- Applicable Equipment: Heavy-duty diesel engine (Cummins mainstream engine series matching part for 4089804)
- Surface Treatment: Anti-corrosion coating on steel back; oil groove & oil hole designed for continuous lubrication supply
2. Installation Position
This bearing is installed between the big end bore of the engine connecting rod and the connecting rod journal of the crankshaft:
- Separate the two half-shell bearings and embed them into the inner circular cavity of the connecting rod big end cap and the connecting rod body respectively;
- Align the positioning tang of the bearing with the positioning notch on the connecting rod bore to prevent the bearing from rotating during engine operation;
- After placement, fasten the connecting rod bolts to clamp the two half bearings tightly around the crankshaft connecting rod journal;
- Each engine cylinder is equipped with one complete set (2 half bearings) of 4089804 connecting rod bearings.
3. Core Functions
- Reduce Friction & Wear Form a uniform oil film between the crankshaft journal and connecting rod to convert dry friction into liquid friction, drastically lower metal-to-metal abrasion of crankshaft and connecting rod.
- Bear Dynamic Load Withstand huge alternating impact load, compression force and inertial force generated during piston reciprocating movement, transfer power from piston to crankshaft stably.
- Lubrication Storage & Transmission Built-in oil holes and oil grooves store engine lubricating oil, maintain continuous oil film under high-speed operation to avoid dry seizure.
- Shock Absorption & Buffer The soft alloy friction layer absorbs tiny vibration and impact produced by engine combustion, protect expensive crankshaft and connecting rod main components.
- Overload Protection The soft alloy layer will wear preferentially under abnormal lack of lubrication or overload, sacrificing itself to avoid permanent scratch and damage to the crankshaft journal (much higher replacement cost).
