Sealing System Leakage Analysis - Case and O.D.
Measure Seal Outer Diameter
| Probable Causes | Actions or Countermeasures |
|---|---|
| Wrong seal for the application. | Check for proper seal identification. |
| Bore or housing reworked. | Check housing print. Also check for evidence of rework such as chuck marks. |
Check for Severe Scratches on the OD
| Probable Causes | Actions or Countermeasures |
|---|---|
| Damaged bore or bore chamfer. | Check condition of bore and chamfer. |
| Die scratches from case forming operation | Check for OD coating or sealant in scratches. |
Below is an example of a seal that was installed with no lead in chamfer on the bore.
Check for Peeled Rubber on the OD
| Probable Causes | Actions or Countermeasures |
|---|---|
| Poor rubber bond to case. | Case OD clean at rubber interface. |
| Lack of lubrication of OD at assembly. | Case OD has rubber adhering to it. |
| Lack of proper lead-in chamfer. | Check bore chamfer condition |
Check for hardness on the Rubber OD
| Probable Causes | Actions or Countermeasures |
|---|---|
| Excessive heat in application. | Check for other evidence of overheating. |
| Improper seal material selection. | Check material vs. operating temperature or lube compatibility. |
Rubber OD Nonfills and Cuts
| Probable Causes | Actions or Countermeasures |
|---|---|
| Improper seal manufacture. Prep weight or shape out of spec. | Consult seal manufacturer. |
| Bore chamfer sharp or damaged. | Inspect bore chamfer. |
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