We replace the crankshaft oil seals when the engine is completely overhauled or if there is oil leakage in the oil seal area
It is advisable to check the front oil seal when replacing the timing belt
We check the rear oil seal and change it when replacing the clutch discs.
If the rear oil seal is defective, then oil will leak at the junction of the gearbox and engine.
Before you replace the oil seals, you need to make sure that the crankcase ventilation system is clean.
With a clogged system, backpressure will displace oil even with good oil seals.
To replace the front crankshaft oil seal, you need to remove the timing belt (see the article on replacing the timing belt).
After removing the timing belt, do not turn the crankshaft and camshaft.
Pry off the crankshaft toothed pulley with a screwdriver.
If the pulley is too tight, then you need to use a puller.
You can also screw in two 6 bolts and pull out the pulley with two tongs
Remove the pulley from the toe of the crankshaft.
Pry off the oil seal with a screwdriver and remove it from the socket
Apply a thin layer of engine oil to the working edge
We press the oil seal with a suitable tool head
If the oil seal has not reached its depth, then you can repress it using the old oil seal.
Install the toothed pulley so that the protrusion in its hole enters the keyway at the end of the crankshaft
The threaded holes on the pulley must be on the outside
After that, we collect all the details in reverse order.
Replacing the rear crankshaft seal
To replace the crankshaft rear oil seal, you need to remove the gearbox and the clutch pressure and driven discs. Next:
It is necessary to mark the position of the crankshaft and flywheel with a felt-tip pen or other suitable tool (flywheel and crankshaft are balanced together).
We insert a bolt into the crankcase hole (you can use the gearbox mounting bolt), and stop the flywheel from turning.
With a 17 head, unscrew the seven flywheel mounting bolts
Remove the flywheel
Pry off the oil seal with a screwdriver and pull it out of the socket
Apply and the working surface of the new oil seal is a thin layer of engine oil.
We put the oil seal on the crankshaft flange.
We fill the working edge of the stuffing box with a thin wooden or plastic spatula.
When pressing the oil seal, use the old oil seal as a mandrel.
Install parts in reverse order. We install the flywheel according to the marks and bait all 7 bolts.
Before tightening the bolts, apply sealant to the threaded part.
Tighten the flywheel bolts with a tightening torque of 65 Nm.