We replace the crankshaft seals in case of oil leakage
If traces of oil leakage through the crankshaft seals are found, first you need to check if the crankcase ventilation system is clogged and if the hoses of this system are pinched.
If the oil does not stop leaking, you need to replace the oil seals.
The need to replace the front crankshaft oil seal is oil leakage through its edge.
Oil is sprayed by the rotating crankshaft pulley, which oiles the front of the engine and the timing belt.
Oiling the clutch discs, maybe a leak in the gearbox input shaft oil seal or the crankshaft rear oil seal.
Engine oil and gear oil have different smells, so you can tell which oil seal is leaking.
To replace the oil seals, you will need tools: socket heads for 10, 16, 17, 18, keys for 11, 13, a flat screwdriver, a Torx E14 head, a retainer for setting the TDC, a camshaft retainer, pliers, a hammer.
Replacing the front crankshaft oil seal
We install the car on a lift or a viewing ditch.
Removing the timing belt (article - How to replace a Nissan Almera timing belt).
After removing the belt, do not turn the crankshaft and camshaft
We pry off the oil seal with a screwdriver and remove it from the seat in the cylinder block cover.
We apply a thin layer of engine oil to the working edge of the new oil seal, press the oil seal into the socket using a tool head of a suitable size.
It is necessary to press the gland to the same depth to which the old gland was pressed (the gland should be slightly recessed into the cover).
For a more precise fit of the gland in the cover, you can repress it with the help of an old gland and a toothed pulley
...by tightening the accessory drive pulley bolt
We assemble the timing drive in the reverse order.
When installing the toothed pulley, its protrusion 1 (acting as a key) must enter the groove 2 on the toe of the crankshaft, and the threaded holes 3 on the end of the pulley must face outward.
Replacing the crankshaft rear oil seal
We install the car on a lift or a viewing ditch.
Remove the gearbox.
Remove the clutch discs.
The engine flywheel is attached to the crankshaft flange in only one position.
Mark the position of the flywheel relative to the shaft with a marker.
We fix the flywheel from turning by inserting the blade of a large flat screwdriver between the teeth of the flywheel ring and rest on the stud of the cylinder block "A".
With a 17 head, unscrew the seven flywheel mounting bolts
Remove the flywheel
We pry off the crankshaft rear oil seal with a flat screwdriver and remove it from the seat
When installing the oil seal, use a thin flat screwdriver to fill the working edge of the oil seal on the crankshaft flange.
Using the old oil seal, we press a new oil seal into the seat of the cylinder block.
Set the flywheel according to the marks.
Before installing the flywheel mounting bolts, apply sealant to their threaded part.
We twist and evenly tighten the flywheel mounting bolts to a torque of 55 Nm.
Further assembly is carried out in the reverse order.