Car engine repair VAZ-2121

In this section, all articles on the removal, disassembly, repair and assembly of the engine of VAZ-2121 Niva cars.

Longitudinal and transverse sections of the engine
Longitudinal and cross-sectional views of the engine are shown in Fig. 2-1 and 2-2. Fig. 2-1. Longitudinal section of the engine Fig. 2-2. Cross-section of the engine

Possible engine malfunctions, their causes and methods of elimination
The engine does not start Engine runs rough or stalls at idle The engine does not develop full power and does not have sufficient throttle response Knocking of crankshaft main...

Removal and installation the engine
Place the car on a lift or over an inspection pit. Remove the hood. Remove the spare tire and remove the spare tire support tube. Disconnect the wires from the battery and from...

Disassembling the engine
Wash the engine on a washing machine, install it on a disassembly stand and drain the oil from the crankcase. Remove the carburetor, disconnecting the hoses and the throttle drive...

Engine assembly
Place the washed and cleaned cylinder block on the stand and tighten the missing studs. Place the bearing shells without a groove on the inner surface in the middle bearing socket...

Engine bench testing
The repaired engine is subjected to bench tests (running-in) without load according to the following cycle: 850-900 min⁻¹ — 2 min 1000 min⁻¹ — 3 min 1500 min⁻¹ — 4 min 2000 min⁻¹...

Checking the engine on a car
After installing the engine on the vehicle, carefully check that it is installed correctly. Let the engine run for a while, then check: check for coolant and fuel leaks in the...

Cylinder Block — Inspection and Checking
The main dimensions of the cylinder block are shown in Fig. 2-21. General cleaning and inspection Wash the cylinder block thoroughly and clean the oil passages. Blow and dry the...

Pistons and connecting rods — pressing out the pin and cleaning
The main dimensions of the connecting rod and piston group are given in Fig. 2-25. Since 1988, the piston diameters of the 2121 engine have been increased by 0.01 mm. Pressing out...

Selecting a piston for a cylinder
Calculated clearance between piston and cylinder (for new parts) is 0.06-0.08 mm (since 1988 the gap has been reduced to 0.05-0.07 mm). It is determined by measuring the cylinders...

Checking the clearance between the piston and the pin
The pin is pressed into the upper head of the connecting rod with tension and rotates freely in the piston bosses. Note. According to the outer diameter, the pins are divided into...

Checking the clearances between piston grooves and rings
Check the height clearance between the grooves and rings as shown in Fig. 2-28, inserting the ring into the corresponding groove. The nominal (calculated) clearance for the upper...

Checking the clearance between the bearings and the crankshaft
The clearance between the bearing shells and the crankshaft journal can be checked by calculation (having measured the details) or calibrated plastic wire; for what: carefully...

Piston mass control
The mass of pistons in one engine must not differ from each other by more than ±2.5 g. If there is no set of pistons of the same weight group, it is possible to remove some of the...

Assembly of the connecting rod and piston group
Since the pin is inserted into the upper head of the connecting rod with tension, heat the connecting rod to 240°C to expand its head. To do this, place the connecting rods in an...

Checking the pin pressing
After assembling the connecting rod-pin-piston group, check the strength of the pin pressing using a torque wrench and device A.95615: clamp base 4 (Fig. 2-33) of the device in a...

Checking the parallelism of the axes of the lower connecting rod head and the piston pin
Before installing the assembled connecting rod and piston group on the engine, check the parallelism of the group axes using a special device (Fig. 2-34). To check the lower head...

Crankshaft — inspection and repair
The main dimensions of the crankshaft are given in Fig. 2-35. Fig. 2-35. Main dimensions of connecting rod and main journals of the crankshaft and their fillets Cleaning the...
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Flywheel — inspection and repair
Check the condition of the ring gear; if the teeth are damaged, replace the flywheel. The flywheel surfaces mating with the crankshaft and the driven clutch disc must be free of...

Removal and installation the cylinder head
The cylinder head is removed from the engine on the car if it is not necessary to remove the engine itself to fix the malfunction, or if it is only necessary to remove carbon...

Disassembly and assembly of the cylinder head and valve mechanism
The main dimensions of the cylinder head are given in Fig. 2-40. Install the cylinder head on the board A.60335. Disconnect the exhaust manifold and intake manifold from the...

Checking and grinding valve seats
The shape of the valve seat chamfers is shown in Fig. 2-43 and 2-44. On the working chamfers of the saddles (valve contact area) there should be no pitting, corrosion or damage....

Valve repair
Remove carbon deposits from the valves. Check if the stem is deformed and if there are any cracks on the plate; if damaged, replace the valve. Check whether the working chamfer is...

Cylinder head gasket
The surfaces of the gasket must not have any damage. They must be smooth, without dents, cracks, swellings and fractures. Peeling of the lining material from the reinforcement is...

Adjusting the clearance between the levers and the camshaft cams
The main dimensions of the camshaft and camshaft bearing housing are shown in Fig. 2-52, and the section of the cylinder head and block along the exhaust valve is shown in Fig....

Adjusting the camshaft chain tension
Loosen nut 1 (Fig. 2-55) of the tensioner. This releases rod 3 and the chain is tensioned by shoe 7 (Fig. 2-56), which is acted upon by spring 8 (Fig. 2-55). Turn the crankshaft...

Checking the camshaft
The bearing journals of the camshaft must not have any scoring, nicks, scratches, or aluminum drag from the bearing housings. The working surfaces of the cams must not have wear...

Tensioner — inspection, disassembly and assembly
Disassembly and assembly. To disassemble the chain tensioner, remove the cap locking nut 1 ( see fig. 2-55 ), clamp cracker 9 and spring ring 4, then remove plunger 7, spring 5...

Camshaft drive chain
Wash the chain in kerosene and then check the condition of its links. No chips, cracks or other damage are allowed on the rollers and cheeks. When the engine is running, the chain...

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More articles from other manuals on VAZ cars:
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