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Greg's Engine & Machine

Engine Bearing Failure Chart





Bearing Fatigue

Type: Plated Copper Lead

Distressed upper connecting rod bearing caused by engine lugging.

Type: Aluminum

Lining fatique due to excessive loading.

Type: Plated Copper Lead

Overplate fatigue due to excessive loading.

Type: Plated Copper Lead

A bent connecting rod led to the destress in the "V" pattern observed.

Bearing Seizure


Type: Plated Copper Lead

Seizure due to excess tension of accessory drive belt. Debris from upper is embedded in lower bearing.


Type: Plated Copper Lead

These bearings exhibit damage resulting from raised metal around the crank oil hole. Crankshaft is wiping material from the center of the bearing. No lubrication is present between the crankshaft and bearing in that area.


Type: Aluminum

Seizure resulting from lack of lubrication. Note lining worn, exposing steel backing.

Bearing Wear



Type: Plated Copper Lead

Polished and oil-stained backs are a result of a poor fit in the housing.



Type: Plated Copper Lead

  • Poor crankshaft finish exposed copper matrix.
  • Acid in lube oil resulted in corrosion.
  • Porous matrix resulted in lining fatique.




Type: Plated Copper Lead

Rear thrust face worn to steel backing due to excessive thrust load and poor crankshaft finish.



Type: Plated Copper Lead

Wear due to poor crankshaft finish which wore through overplate and nickel barrier to copper matrix.



Type: Plated Copper Lead

  • Bearing worn through overplate and nickel barrier due to tapered journal.
  • Corrosion of lead phase resulted in lining fatique.
  • Copper lead matrix was exposed to corrosive acids in lube oil.