A sign of the need to replace the front crankshaft oil seal is an oil leak through its edge

Oil is splattered by the rotating crankshaft pulley, leaving the entire front of the engine and engine compartment oiled.

A sign of the need to replace the crankshaft rear oil seal is an oil leak through its edge.

Oil is sprayed by the rotating flywheel inside the clutch housing and then flows out through the slots between the crankcase and clutch booster.

At a strong leak, the lining of the clutch disc may become oily and, as a result, the clutch will slip.

The reasons for oiling the clutch discs and oil leakage from the clutch housing may be a leak in the gearbox input shaft oil seal.

Engine and transmission oils differ in smell, so with a certain skill it can be used to determine which of the oil seals is defective.

There is another way to determine the type of oil.

Drop the oil into the water poured into the vessel in a thin layer (possibly in a puddle).

The gear oil will spread over the entire surface of the water in the form of an iridescent film, and the engine oil will remain in the form of a drop similar to a lentil grain.

Before replacing the front crankshaft oil seal in the event of a leak, check the cleanliness of the crankcase ventilation system, as if it is clogged, the increased gas pressure in the crankcase causes a leak even with a good oil seal.

Replacing the front crankshaft seal

Remove the engine mudguard, accessory drive belt, timing sensor, radiator fan (see relevant articles).

How to replace crankshaft seals ZMZ-406

For the convenience of work, having unscrewed the two bolts with a 17 wrench and without disconnecting the hoses, put the hydraulic booster on the battery shelf (for a car with power steering).

How to replace crankshaft seals ZMZ-406

With a head of 36, we unscrew the bolt securing the crankshaft pulley.

We keep it from turning with a screwdriver inserted between the teeth.

How to replace crankshaft seals ZMZ-406

Using two mounting blades, we evenly press the crankshaft pulley from the front cover of the engine crankcase

How to replace crankshaft seals ZMZ-406

Remove the crankshaft pulley.

How to replace crankshaft seals ZMZ-406

Prying off with a screwdriver, remove the cuff.

How to replace crankshaft seals ZMZ-406

Having filled two-thirds of the cavity between the working edge and the anther of the new cuff with Litol-24 grease, we press it into place, using the old cuff as a mandrel

Replacing the rear crankshaft seal

In order to replace the crankshaft rear oil seal, follow these steps.

Remove the gearbox (see Removing and installing the gearbox gear).

Remove the clutch (see Removing and installing the clutch).

Remove the flywheel (see Removing and installing the flywheel ).

How to replace crankshaft seals ZMZ-406

With a 17 head, we unscrew the six bolts securing the flywheel, keeping it from turning with a screwdriver inserted between the teeth.

How to replace crankshaft seals ZMZ-406

Having removed the washer, remove the flywheel.

How to replace crankshaft seals ZMZ-406

Prying off with a screwdriver, remove the cuff.

How to replace crankshaft seals ZMZ-406

Having filled two-thirds of the cavity between the working edge and the anther of the new cuff with Litol-24 grease, we press it into place, using the old cuff as a mandrel

We install the removed nodes in the reverse order.

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