The automotive radial lip seal works by creating a thin layer of oil between the sealing lip and shaft journal. Capillary action causes the oil to seep between the lip and the shaft, which results in the oil lifting the sealing lip clear of the shaft.
This thin layer is retained, and prevents leakage of the oil past the sealing lip.
It is important to ensure that the seal is fitted square in the housing and perpendicular to the shaft and that end float and radial shaft run out is not excessive.
Type A Single Lip Rubber Coated w/ Spring
Type ADL Double Lip-Rubber Coated w/ Spring
Type AO Single Lip-Rubber Coated - No Spring
Type BO Single Lip - Metal Case
LUBRICATION
The sealing lip of the oil seal should never be in contact with the shaft. If this were the case, the seal
would wear out in a matter of hours, therefore precaution must be taken that the seal is correctly lubricated prior to fitting.
If this lubrication is not present, burning of the seal lip can occur, which could lead ultimately to seal failure.
In our experience, the use of a non-molybdenum (general purpose) based grease on all oil seals as an
initial start up lubricant is recommended, as it will lubricate and readily disperse in engine oil. An exception to this is where a PTFE seal is being used.
Type BODL Double Lip - Metal Case
Type C Single Lip - Full Metal Case w/ Spring
Type AODL Double Lip
OIL SEAL MATERIAL
Material selection for automotive engine applications is based on size, operating temperature,environment, pressure and maximum shaft surface speed. Most dynamic oil seals materials, for automotive engine application, fall into five categories.
PolyTetraFluoroEthylene (PTFE)
Fluoroelastomer ( Viton )
Silicone
Poly Acrylate
Nitrile
Type B Single Lip-Metal Case w/ Spring
Type BDL Double Lip
General Purpose Polyurethane
Hot Water Resistant Polyurethane
Nitrile Buna Rubber
Hodrogenated Nitrile
Fluorocarbon
Ethylene Propylene
Silicone
Fluoro-Silicone
Perfluoroelastomer
Ultra High Holecular Weight Polyethylene
Polyacetal
Polyetheretherkeytone
Thermoplastic Elastomer
Polyamid
PTFE Filled Polyamid
Polytetrafluoroethylene*
Polytetrafluoroethylene*
Polytetrafluoroethylene*
Polytetrafluoroethylene*
Composites
Type CDL Double Lip - Full Metal Case w/ Spring
Type CO Single Lip - Metal Case - No Spring
Minimum Quantities required for Oil Seal orders. Quick delivery for in stock Items Samples provided on large Quantities Quality Guaranteed Made to order Parts
