482-4245 0.63mm oversize bearing CAT spare part

482-4245 0.63mm oversize bearing CAT spare part Featured Image
  • 482-4245 0.63mm oversize bearing CAT spare part
  • 482-4245 0.63mm oversize bearing CAT spare part
  • 482-4245 0.63mm oversize bearing CAT spare part

Short Description:

387-9840 CAT engine crankshaft assembly fits CAT C3.3B small diesel engine for 308E, 308E2 mini excavators and 259D, 279D skid steer loaders. Forged alloy steel integrated structure with timing gear, converts piston reciprocating linear motion into rotary power for small construction machine overhaul.


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description

This is oversize crankshaft main bearing with bimetallic thin-wall construction. It adopts high-strength steel backing with anti-friction alloy lining. When crank journals are worn and scored, journals can be reground, and this +0.63mm oversize bearing restores the correct clearance instead of replacing the whole crankshaft. It is widely used for 312D2, 318D2, 320GC excavators, backhoe loaders and compact generator sets for C4.4 series engine overhaul.

Part number: 387-9840
Alternative name: Crankshaft AS
Fit engine: CAT C3.3B
Fit machine: 308E, 308E2 CR excavator; 236D, 242D, 246D, 259D, 279D, 289D skid steer loader; 906H2, 907H2, 908H2 compact wheel loader
Material: Alloy Mixed Metal
Structure: Pre-installed counterweights, integrated timing gear
Process: Forging, quenching & tempering, journal precision grinding, oil passage polishing, dynamic balance calibration
Matching system: C3.3B electronic diesel engine

Advantages

1. Standard +0.63mm oversize dimension fits reground crankshaft journals and saves high cost of new crankshaft.
2. Rigid steel backing resists deformation, alloy lining provides good running-in property and prevents seizure.
3. Honed inner surface with fine oil retention texture builds stable oil film at high speed.
4. Precisely positioned oil holes align with block oil passages to guarantee continuous oil supply.
5. Tight tolerance ensures uniform clearance, suitable for long-time variable load operation of electronic engines.
6. OE matching dimension, consistent thickness within the same set for good assembly balance.

FAQ 

Q1: Can 482-4245 oversize bearing fit standard unground crankshaft journal directly?
A1: Not allowed. It will cause insufficient clearance and bearing seizure.
Q2: Can bearing with light scratches on alloy layer be reused?
A2: Replace once alloy lining is scratched, peeled or discolored. Only keep bearings with intact alloy surface.
Q3: Should connecting rod bearings be oversize matched together?
A3: Inspect rod journals. If rod journals are reground, use matching oversize rod bearings.
Q4: How to store the bearing shells?
A4: Pack separately, avoid scratches on alloy surface, store in dry environment against rust.

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