463-3918 Main bearing shell CAT spare part

463-3918 Main bearing shell CAT spare part Featured Image
  • 463-3918 Main bearing shell CAT spare part
  • 463-3918 Main bearing shell CAT spare part
  • 463-3918 Main bearing shell CAT spare part
  • 463-3918 Main bearing shell CAT spare part

Short Description:

461-3043 CAT one-piece forged crankshaft assembly with induction hardened journals and internal oil galleries. It converts piston reciprocating motion into rotary power for overhaul of CAT C15 engines fitted on mining trucks, large excavators and generator sets.


Product Detail

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description

This main bearing is the key support component for C15 crankshaft. It is supplied as split half shells with steel backing and aluminum alloy lining. Oil grooves on the surface keep consistent lubricating film and absorb cyclic radial impact load. Designed for heavy mining applications, widely used on 735,740 articulated trucks, 374,385 excavators and generator sets. It is matched with thrust washers and connecting rod bearings during full engine overhaul.

Part number: 463-3918
Alternative name: Main bearing shell
Structure: Split bimetallic thin-wall bearing
Material: Steel Backed Copper-Lead Bearing
Process: Steel stamping, alloy sintering, bore honing, oil groove machining, size sorting and pairing
Fit engine: CAT C15 diesel engine
Fit machine: 374,385 excavator, 735,740 articulated mining truck, high-power industrial generator set
Mounting position: Between cylinder block main bearing saddle and crankshaft main journal
Function: Support crankshaft, form lubricating oil film, carry radial load and reduce journal wear

Advantages

• Made of durable materials for longevity and reliability.
• Provides support and allows smooth rotation of the crankshaft.
• Enables lubrication through oil passages and grooves.
• Distributes loads and forces evenly across the bearing surface.

1. Aluminum alloy lining has good conformability, tolerates minor journal scratches and resists seizure.
2. Rigid thin steel backing fits tightly on block saddle, resistant to deformation under heavy load.
3. Precisely honed bore keeps tight clearance control and stable oil film for long mining operation.
4. Optimized oil groove layout delivers even oil supply and prevents dry contact and seizure.
5. Factory sorted and paired shells for consistent clearance after installation.
6. Compatible with all C15 construction variants, easy stocking for overseas mining fleets.

FAQ 

Q1: Can 463-3918 fit 3406E engine?
A1: Not interchangeable. 3406E and C15 differ in journal diameter, shell width and oil groove design.
Q2: Can I replace only one damaged shell and reuse the rest?
A2: Not recommended. Wear rate differs between new and old shells. Full set replacement is preferred.
Q3: Can slightly blackened main bearing without flaking be reused?
A3: Black discoloration comes from heat oxidation. Reuse only if alloy layer is intact and clearance meets spec; replace during overhaul.
Q4: How to store bearing shells?
A4: Keep individually sealed, protect alloy surface from scratches and store in dry place.

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