1W-1661 Main bearing shell CAT spare part

1W-1661 Main bearing shell CAT spare part Featured Image
  • 1W-1661 Main bearing shell CAT spare part
  • 1W-1661 Main bearing shell CAT spare part
  • 1W-1661 Main bearing shell CAT spare part

Short Description:

1N-4318 CAT STD main bearing with 127.61 mm outer diameter, bimetallic thin-wall split crankshaft main shell for radial load support, used for overhaul of CAT D353 engine fitted on D9H crawler tractors.


Product Detail

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description

This main shell is wide oversize main bearing for 3204 engine, 29.72mm in width. Copper-lead alloy lining bonded to steel backing, with oil holes and grooves to maintain stable oil film. It is designed for regrinded crank journals, compensating material removed during crankshaft repair. Widely fitted on legacy compact construction machines including D3, D4 dozers, track loaders and backhoe loaders, commonly used for 3204 crank repair jobs.

Part number: 1W-1661
Alternative name: Main Bearing shell
Width: 29.72 mm
Size: 0.25mm oversize (0.010″)
Structure: Split bimetallic thin-wall bearing shell
Material: Steel Backed Aluminum Bearing, Steel Backed Copper-Lead Bearing
Process: Stamping, alloy casting, inner bore honing, oil hole machining, deburring
Fit engine: CAT 3204
Fit machine: 215B excavator, D3/D3B/D3C/D4C dozer, 931B/943/953 track loader, IT18/IT28 integrated toolcarrier, 916/926 wheel loader
Mounting position: Crankshaft main journal
Function: Support crankshaft, build oil film, bear radial load, match regrinded crank journals

Advantages

1. 29.72mm wide design increases contact area for better impact load capacity.
2. 0.25mm oversize dimension for regrinded crank journals, saving crank replacement cost.
3. Copper-lead alloy has good conformability, tolerates minor journal scoring and resists seizure.
4. Precisely positioned oil hole aligns with block galleries for consistent oil supply.
5. Tight flatness control on shell back prevents bearing rotation and shifting.
6. Compatible with multiple 3204 machine variants, convenient for old fleet stock.

FAQ 

Q1: Is 1W-1661 standard or oversize bearing?
A1: It is 0.25mm oversize bearing, only for reground crank journals. Not for new STD crankshaft.
Q2: Can 1W-1661 interchange with 1W-1665?
A2: Not interchangeable. They differ in tolerance and oil hole layout, check part number strictly.
Q3: Can I replace only this single shell and reuse old ones?
A3: Single replacement is allowed, but recheck clearance. Full set replacement is preferred.
Q4: How to store the bearing shell?
A4: Pack individually, protect alloy surface from scratches and store in dry anti-rust environment.

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