Crankshaft seal for automobile
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MITSUBISHIInformation - Shaft seal crankshaft
Crankshaft oil seal: replacement and selection
When and why it is necessary to replace crankshaft oil seal
On the average, operational lifetime of the front and rear crankshaft oil seals is 100,000 – 150,000 kilometers of mileage. Premature replacement of these parts can be required due to elasticity loss, mechanical defects or deformation, thermal damages, free play in the place of contact between the oil seal and the crankshaft. Also the component is replaced in case of its displacement.
Loss of car part elasticity is often the result of its drying-out due to long-time (more than half a year) non-use of the car. Moreover, the oil seal can freeze if the car was left in freezing temperature. As a rule, defects and deformation of the component are the result of crankshaft vibrations. Also the oil seal can be damaged because of improper installation. Melting of the part is caused by engine overheating, its displacement from the mounting seat – by increased crankcase gases pressure.
The main sign of crankshaft oil seal defect is leakage of oil. During this, oil level is reducing, which is noticeable at checking with the help of the dipstick. If the rear oil seal got damaged, clutch slipping can take place. During scheduled replacement of the timing belt you can find oil stains on it, which also point out defectiveness of the crankshaft oil seals.
It is recommended to perform replacement of the oil seal at a service station: the procedure presupposes usage of a lifting device. Moreover, replacement of the rear oil seal involves removal of the gearbox and the clutch assembly; and for demounting of the front one, a special remover tool is necessary.
How to select crankshaft oil seal
These components are made of various materials: fluororubber (FPM, FKM), polyacrylic rubber (ACM), Teflon (PTFE), butadiene-nitrile rubber (NBR), silicon rubber (MVG, VMQ).
Also the crankshaft seals are divided into double-edge (with the dust boot) and single-edge (without the dust boot) ones. The advantage of the parts with the dust boot lies in the fact that they not only prevent oil leakage, but also protect the unit from ingress of dust and moisture.
The crankshaft oil seals can be of various types according to the cross-section type. So, there are parts with metal coating, with smooth surface, with grooved surface, with hydrodynamic effect. The grooved components improve the mounting tightness, while the hydrodynamic ones are considered more durable.
In order to make the crankshaft oil seals serve faultlessly during the whole operation lifetime, give preference to products of reliable manufacturers. High-quality components are presented in the assortment of Ajusa, Corteco, Elring, Glaser, Payen, Victor Reinz and other brands.
During purchasing these car parts you need to consider their mounting location: in the front or in the rear. No less important selection parameter is the type of oil seal, its height, outer and inner diameters. Moreover, you need to take into account the direction of oil grooves rotation.
Crankshaft seal at low cost: Top Spares
Article №: 12010674B 
- Fitting Position Timing End
- Material ACM (Polyacrylate)
- Swirl Type Right-hand Twist
- Dust Cover with dust lip
- Height 1 [mm] 7
- Inner diameter 2 [mm] 30
- Diameter [mm] 42
- Condition New
Article №: 81-34366-00 
- Inner diameter [mm] 35,00
- Material PTFE (polytetrafluoroethylene), ACM (Polyacrylate)
- Width [mm] 10,00
- Swirl Type Right-hand Twist
- Radial Shaft Seal Design A SL
- Supplementary Article/Info 2 with mounting sleeve
- Diameter [mm] 48,00
- Condition New
Article №: 03598 
- Inner diameter [mm] 32,0
- Fitting Position Timing End
- Material FPM (fluoride rubber)/ACM (polyacrylate rubber)
- Thickness [mm] 10,0
- Weight [kg] 0,03
- Diameter [mm] 47,0
- Condition New
Article №: 12013859B 
- Fitting Position Timing End
- Material FPM (fluoride rubber)
- Swirl Type Right-hand Twist
- Dust Cover with dust lip
- Height 1 [mm] 7
- Inner diameter 2 [mm] 35
- Diameter [mm] 47
- Condition New
Article №: 21074 
- Inner diameter [mm] 90,0
- Fitting Position Transmission End
- Material FPM (fluoride rubber)/ACM (polyacrylate rubber)
- Width [mm] 12,0
- Weight [kg] 0,046
- Diameter [mm] 110,0
- Condition New
Article №: 20026412B 
- Fitting Position Timing End
- Material PTFE (polytetrafluoroethylene)
- Swirl Type Right-hand Twist
- Dust Cover with dust lip
- Height 1 [mm] 10
- Supplementary Article/Info 2 with mounting sleeves
- Inner diameter 2 [mm] 35
- Diameter [mm] 48
- Condition New
Article №: 302 171 
- Inner diameter [mm] 40
- Fitting Position Timing End
- Material PTFE (polytetrafluoroethylene)/ACM (polyacrylate rubber)
- Swirl Type Right-hand Twist
- Dust Cover with dust lip
- Height [mm] 6,4
- Rotation Direction Clockwise rotation
- Diameter [mm] 55
- Condition New
Article №: 12015763B 
- Fitting Position Transmission End
- Material FPM (fluoride rubber)
- Height 1 [mm] 12
- Supplementary Article/Info 2 with flange, with mounting sleeves
- Outer diameter 2 [mm] 172
- Inner diameter 2 [mm] 93
- Diameter [mm] 139,7
- Condition New
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