Disassembly of the engine was discussed in the article - "Disassembly of the engine"

Fault detection of engine parts was considered in the article - "Engine fault detection"

In this article, we will look at the main points of assembling the VAZ-2112 engine.

Before reassembly, all engine parts must be washed and decontaminated.

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Before installing the upper main bearing shells with an aerosol carburetor cleaner, clean the nozzles for cooling the pistons.

Install the liners in the bed of the main bearings.

In this case, the retaining protrusion of the liner must enter the groove of the bed.

Install liners with grooves in the first, second, fourth and fifth beds (counting from the camshaft drive), and in the third - without a groove.

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Lubricate the liners with engine oil

Lubricate the crankshaft journals with engine oil and lay the shaft in the bed of the main bearings.

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We insert thrust half rings lubricated with engine oil into the grooves of the third main bearing support.

The surfaces of the half rings with an anti-friction coating (grooves are made on them) should face the crankshaft cheeks.

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We turn the half rings so that their ends are flush with the ends of the bed.

We install the main bearing caps in accordance with the marks on their outer surface (the caps are counted from the timing belt drive side).

In this case, the locks of the upper and lower shells of each main bearing must be located on one side.

Как собрать двигатель ВАЗ-2112

We wrap the cover bolts without tightening them

Как собрать двигатель ВАЗ-2112

Marks on the main bearing caps

We tighten the cover bolts to a torque of 69-84 Nm (6.9-8.4 kgf · m).

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First we tighten the bolts of the third cover, then the second and fourth, then the first and fifth.

After tightening the bolts, turn the crankshaft - it should rotate easily, without jamming.

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We measure the axial clearance of the crankshaft.

It should be in the range of 0.06-0.26 mm.

If the gap is greater than 0.26 mm, replace the thrust half rings

Как собрать двигатель ВАЗ-2112

To measure the axial clearance of the crankshaft, install the indicator so that its foot rests against the shaft flange.

Move the crankshaft all the way away from the indicator and set the indicator to 0.

Move the crankshaft in the opposite direction.

The indicator will show the size of the gap.

In front (from the side of the crankshaft pulley) a steel-aluminum half-ring is placed, in the back - a cermet one.

Rings are manufactured with a nominal thickness and increased by 0.127 mm.

When the axial clearance of the crankshaft exceeds 0.35 mm, one or both half rings change (the nominal clearance is 0.06-0.26 mm).

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Press the crankshaft rear oil seal into the holder using a mandrel until it stops.

We glue the holder gasket to the gland holder with grease for ease of installation

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Lubricate the working edge of the oil seal with engine oil.

Lubricate the crankshaft flange with engine oil.

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We put the oil seal with the holder on the crankshaft flange and carefully fill the working edge of the oil seal with a pointed stick

We move the holder with the gland along the flange until it stops and screw on the fastening bolts

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Adjust the holder so that its top plane coincides with the plane of the block

Tighten the six mounting bolts of the holder

We prepare the oil pump for assembly.

We press the front crankshaft oil seal into the pump housing.

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Lubricate the working edge of the oil seal with engine oil

Lubricate the oil pump gears with engine oil by pouring oil through the oil receiver hole.

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We turn the gears of the oil pump several times by the protrusions of the drive gear.

We turn the drive gear of the oil pump so that the protrusions of the drive gear coincide with the flats on the crankshaft.

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Flats on the crankshaft

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We glue the gasket to the pump with grease for ease of installation.

Slide the pump with the oil seal onto the crankshaft up to the seat on the shaft. Then, using a sharpened softwood stick, carefully tuck the lip of the oil seal onto the shaft journal.

Как собрать двигатель ВАЗ-2112

Carefully slide the oil pump along the shaft until it stops and tighten the mounting bolts

Correct the position of the pump so that its upper plane coincides with the plane of the block.

Tighten the six mounting bolts to a torque of 8.5-10.0 Nm (0.85-1.0 kgf m).

When assembling the connecting rod-piston group, it is necessary that the piston pin, lubricated with engine oil, enters the piston bore with the pressure of the thumb and does not fall out of the piston when the finger is in the vertical position.

We install rings on the pistons and arrange them as follows:

- the lock of the upper compression ring is oriented at an angle of about 45 ° to the axis of the piston pin

- the lock of the lower compression ring - at an angle of 180 ° to the axis of the lock of the upper ring.

- oil scraper ring lock - at an angle of 90 ° to the axis of the upper compression ring lock.

Install the lower compression ring with the groove ("scraper") down. If the ring is marked "TOP" or "TOP" - place the ring with the mark up.

When installing the oil scraper ring, place the expander joint on the side opposite to the ring joint.

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We wipe the cylinder mirrors

We wipe the crankshaft connecting rod journals

Lubricate the mirror of the first cylinder with engine oil

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Lubricate the mandrel for installing pistons

Lubricate the piston of the first cylinder

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We part the locks of the rings as indicated above

We insert the liner into the lower head of the connecting rod. The protrusion on the liner should fit into the groove of the connecting rod head

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We insert the insert into the connecting rod cover so that the protrusion on the insert fits into the groove of the connecting rod cover

When installing pistons in cylinders, the arrow on the piston crown must point towards the timing drive.

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We insert the piston assembly with the connecting rod into the mandrel.

We direct the arrow on the piston towards the oil pump and slowly push the piston with the wooden handle of the hammer

We control the correct position of the connecting rod bushings.

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Lubricate the bushings and install the connecting rod cap in accordance with the markings.

The caps on the connecting rods are installed so that the cylinder numbers on the cap and the connecting rod are on the same side

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We wrap the nuts securing the cover. In the same way, we install and tighten the caps of the remaining connecting rods.

Tighten the connecting rod cap nuts with a torque wrench to a torque of 44-54 Nm (4.4-5.4 kgf · m).

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Before installing the flywheel, lubricate the threads of the flywheel mounting bolts with a thin layer.

Install the flywheel so that the mark on the flywheel is opposite the connecting rod cover of the fourth cylinder, since the mounting bolts are asymmetrical

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Install the lock washer and wrap the flywheel

We tighten the flywheel mounting bolts to a torque of 62-89 Nm (6.2-8.9 kgfm), keeping the flywheel from turning

We will consider further assembly of the engine in the continuation of this topic.