A sign that the front crankshaft oil seal needs to be replaced is oil leaking through its edge. The oil is then splashed by the rotating crankshaft pulley, causing the entire front of the engine and the timing belt to become oily.
The reasons for the clutch discs becoming oily may be a leak in the primary shaft seal of the gearbox or the rear seal of the crankshaft.
Motor and transmission oils differ in smell, so with a certain amount of skill you can determine which seal is damaged.
Note: There is another way to determine the type of oil. Drop the oil into water poured into a vessel in a thin layer (you can fall into a puddle). The transmission oil will spread across the entire surface of the water in the form of a rainbow film, while the motor oil will remain in the form of a drop, similar to a grain of lentil.
You will need: all tools needed to remove the timing belt (see Replacing the timing belt), gearboxes (see Removal and installation the gearbox), clutches (see Removal and installation the clutch), flywheel (see Removal, defect detection and installation of the flywheel), as well as a screwdriver and a hammer.
For replacement front crankshaft oil seal, do the following.
1. Disconnect the wire from the negative terminal of the battery.
2. Set the piston of the 1st cylinder to the TDC position of the compression stroke (see Setting the piston of the first cylinder to the TDC position of the compression stroke).
3. Remove the timing belt (see Replacing the timing belt).
4. Remove the crankshaft toothed pulley.
5. Remove the key from the crankshaft nose groove.
6. Using a screwdriver or wire hook, remove the seal from the oil pump housing.
7. Lubricate the working edge of the new oil seal with engine oil, install it in the oil pump housing, orienting the working edge inside the engine, and press the oil seal into the pump housing until it stops using a mandrel. You can use a head from a tool kit of a suitable size or an old oil seal as a mandrel.
8. Install all removed parts and assemblies of the timing mechanism in the reverse order of removal.
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9. Adjust the timing belt tension (see Replacing the timing belt) and the accessory drive belt (see Replacement of auxiliary drive belt).
For replacement rear crankshaft oil seal, perform the following operations.
1. Remove the gearbox (see Removal and installation the gearbox).
2. Remove the clutch (see Removal and installation the clutch).
3. Remove the flywheel (see Removal, defect detection and installation of the flywheel).
4. Remove the oil pan (see Replacing the oil pan seal).
5. Remove the crankshaft position sensor mounting screw…
6. …and remove the sensor.
7. Remove the crankshaft position sensor timing disk.
8. Remove the two bolts securing the crankshaft rear main bearing cover…
9. …and remove the lid.
10. Remove the rear crankshaft oil seal from the socket in the cylinder block.
11. Lubricate the working lip of the new oil seal with engine oil.
12. To avoid damaging the working edge of the rear oil seal, install the oil seal using a drift of the appropriate size.
13. Install the removed components and parts in the reverse order of removal.
Note: When installing the flywheel, lubricate the threaded portion of the flywheel mounting bolts with anaerobic thread locker and tighten them evenly in a crisscross pattern to the specified torque.
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