A sign that the front crankshaft oil seal needs to be replaced is oil leaking from 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.
You will need: all the tools needed to remove the timing drive (see "Replacing the timing belt and its tension roller"), the rear cover of the timing drive (see "Removal and installation the oil pump"), cylinder head covers (see "Replacing the cylinder head cover gasket"), as well as a screwdriver and a hammer.
To replace the front crankshaft oil seal, follow these steps:.
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 and its tension roller").
4. Remove the rear timing cover (see "Removal and installation the oil pump").
5. Using a screwdriver, remove the seal from the oil pump cover.
6. Lubricate the working edge of the new oil seal with engine oil and install it in the oil pump cover, orienting the working edge towards the inside of the engine.
7. Press the seal into the pump cover until it stops using a mandrel. You can use a suitable sized socket from the tool kit or an old seal as a mandrel.
8. Install all removed parts and assemblies of the timing mechanism in the reverse order of removal.
The reason 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 have different smells, so with a certain amount of skill you can determine which of the seals is defective.
Helpful Hint: There is another way to determine the type of oil. Drop the oil into a thin layer of water in a container (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.
To replace the rear oil seal, follow these steps:.
1. Remove the gearbox (see "Removal and installation of a manual 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. Inspect the oil seal: if it has lost its tightness, oil will be visible from its lower part.
5. Using a screwdriver, remove the seal.
6. Lubricate the working lip of the new oil seal with engine oil...
7. ...install it into the cylinder block socket, orienting the working edge inside the engine, and carefully tuck the working edge onto the crankshaft journal.
8. Press the oil seal into the seat until it stops, using a mandrel or an old oil seal as a mandrel.
9. Install the removed components in the reverse order of removal.
Note: When installing the flywheel, lubricate the threaded portion of the flywheel mounting bolts with Loctite or similar thread locking compound.
[The source of the article is available on the website: chevyman.ru]