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Troubleshooting Checklist for Oil Bath Seals



Most seal failures are caused by damage to the seal element or sealing surface during installation of the seal. Proper installation tools are the best protection against damage. Also, never go by appearance when matching replacement seals with original equipment seals. Use the catalog for applications or to cross reference the OEM number.

Seal Trouble Checklist

Use the following table to help diagnose seal problems.

Seal Symptom Probable Cause of Leakage
Case distorted
  • Seal O.D. may be too large for wheel bore
  • Wheel bore excessively out of round
  • Careless seal handling or improper installation tools used
Inner parts of seal assembly loose
  • Use of improper installation tools
  • Wheel housing out of round
  • Seal O.D. too large for wheel bore
Seal cocked in bore
  • Improper tools or installation procedures used
  • Seal O.D. too large for wheel bore
  • Burr or chips in wheel bore prevent proper seating
Shaft gouges or scratches seal
  • Lack of inspection or proper surface preparation before installing
Leakage at seal I.D.
  • Chisel marks on spindle
  • Wrong seal installed
Leakage around seal O.D.
  • Wheel bore out of round (if greater than .002", bore sealant may correct problem)
  • Seal O.D. surface damaged by careless handling or improper installation or burr on edge of seal bore
  • Seal cocked in wheel housing
  • Dirt or scratch on wheel bore
  • Oversize bore
No definite leakage path
  • Possible excessive pre-lubrication on assembly, without actual leakage
Excessive difficulty in replacing wheel on spindle
  • Failure to remove old wear sleeve

This documentation was provided by Federal Mogul.

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