A sign that the front crankshaft oil seal needs to be replaced is oil leaking from its edge. The oil is splashed by the rotating crankshaft pulley, causing the entire front of the engine and the timing belt to become oily.
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 differ in smell, so with a certain amount of skill you can determine which seal is defective.
You will need: all the tools needed to remove the timing belt (see "Replacement and adjustment of belt tension, replacement of the timing drive tension roller"), gearboxes (see "Removal and installation of a manual 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.
To replace the front crankshaft oil seal, follow these steps:.
1. Disconnect the wire from the negative terminal of the battery.
Note. The procedure for replacing the crankshaft seals is shown using the K7J and K7M engines as an example. The crankshaft seals of the K4M engine are replaced in a similar manner.
2. Remove the timing belt (see "Replacement and adjustment of belt tension replacement of the timing belt tension roller").
3. Remove the crankshaft timing pulley.
4. Using a screwdriver, remove the seal from the holder.
5. Lubricate the working edge of the new oil seal with engine oil, install it in the holder, orienting the working edge inside the engine, and press the oil seal into the holder until it stops using a mandrel. You can use a suitable-sized head from a tool kit or an old oil seal as a mandrel.
6. Install all removed parts and assemblies of the timing mechanism in the reverse order of removal.
Note: Pre-tighten the accessory drive pulley mounting bolt to 20 N·m (2.0 kgf·m) and then tighten it further by 68°±6°.
7. Adjust the timing belt tension (see "Replacement and adjustment of belt tension, replacement of the timing drive tension roller") and the accessory drive belt (see "Checking the tension of the auxiliary drive belt").
To replace the rear crankshaft oil seal, perform the following operations.
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 and installation the flywheel").
4. Inspect the seal. If it is not sealed, oil will be visible at the bottom.
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 seal into the socket until it stops using a mandrel of a suitable diameter.
Helpful tip: You can use an old oil seal as a mandrel.
9. Install the removed components in the reverse order of removal.
Warning: Always replace the flywheel mounting bolts with new ones. They cannot be reused.
Notes:
- When installing the flywheel, lubricate the threaded portion of the flywheel mounting bolts with Loctite thread locking compound or similar.
- The tightening torque of the flywheel mounting bolts is 50-55 N·m (5-5.5 kgf·m).