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 transverse sections of the engine are shown in fig. 2-1 and 2-2. Pic. 2-1. Longitudinal section of the engine Pic. 2-2. Cross section of the engine
Removal and installation of the engine Place the vehicle on a lift or over a pit. Remove the hood. Stow the spare wheel and remove the spare wheel support tube. Disconnect the wires from the battery and from the...
Engine disassembly Wash the engine in a car wash, place it on a dismantling stand and drain the oil from the crankcase. Remove the carburetor by disconnecting the hoses and throttle linkage from it....
Engine Assembly Install the washed and cleaned cylinder block on the stand and wrap the missing studs. Lay in the seat of the middle bearing and in its cover - liners without a groove on the...
Bench tests of the engine The overhauled engine is bench tested (running-in) without load for the following cycle: 850-900 min -1 - 2 minutes 1000 min -1 - 3 min 1500 min -1 — 4 min 2000 min -1 - 5 minutes...
Checking the engine on a car After installing the engine on the car, carefully check the correct installation. Let the engine run for a while, then check: is there any leakage of coolant and fuel in the pipe...
Cylinder Block — Inspection and Inspection 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 — pin removal 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...
Piston to cylinder selection Estimated 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 clearance between piston and pin The pin is pressed into the upper head of the connecting rod with an interference fit and rotates freely in the piston bosses. Note. According to the outer diameter, the fingers...
Checking clearances between piston grooves and rings Check the height clearance between grooves and rings as shown in fig. 2-28 by inserting the ring into the corresponding groove. Nominal (estimated) the gap for the upper...
Checking clearance between bushings and crankshaft The clearance between the liners and the crankshaft journal can be checked by calculation (measuring details) or calibrated plastic wire; For what: thoroughly clean the working...
Piston mass control In terms of mass, the pistons of one engine should not differ from each other by more than±2.5 g. If there is no set of pistons of the same weight group, you can remove a part of...
Assembling the connecting rod and piston group Since the pin is inserted into the upper head of the connecting rod with an interference fit, heat the connecting rod to 240°C to expand its head. To do this, place the connecting...
Checking the pin fit After assembling the connecting rod-pin-piston group, check the strength of the pin press-in using a torque wrench and tool A.95615: clamp base 4 (pic. 2-33) fixtures in a vice...
Crankshaft — check and repair The main dimensions of the crankshaft are given in fig. 2-35. Pic. 2-35. The main dimensions of the connecting rod and main journals of the crankshaft and their fillets Cleaning... There is 1 comment
Flywheel — check and repair Check the condition of the ring gear; If the teeth are damaged, replace the flywheel. The surfaces of the flywheel mating with the crankshaft and with the clutch disc must be free...
Removal and installation of a head of cylinders The cylinder head is removed from the engine on the car if the engine itself does not need to be removed to fix the problem, or if it is only necessary to remove carbon deposits...
Checking and grinding valve seats The shape of the chamfers of the valve seats is shown in fig. 2-43 and 2-44. On the working chamfers of saddles (valve contact area) there should be no pitting, corrosion or...
Valve repair Remove carbon deposits from valves. Check whether the rod is deformed and whether there are cracks on the plate; replace valve if damaged. Check whether the working bevel is too...
Cylinder head gasket The gasket surfaces must not be damaged. They should be smooth, without dents, cracks, swelling and kinks. Detachment of lining material from reinforcement is not allowed There...
Adjusting the gap between the levers and camshaft cams The main dimensions of the camshaft and camshaft bearing housing are given in fig. 2-52, and a section of the head and cylinder block along the exhaust valve in fig. 2-53. Pic....
Camshaft chain tension adjustment Loosen nut 1 (pic. 2-55) tensioner. In this case, the rod 3 is released and the chain is tensioned with shoe 7 (pic. 2-56), which is acted upon by the spring 8 (pic. 2-55). Rotate...
Checking the camshaft On the bearing journals of the camshaft, scuffing, nicks, scratches, aluminum enveloping from bearing housings are not allowed. On the working surfaces of the cams, wear of more...
Tensioner — check, disassembly and assembly Disassembly and assembly. To disassemble the chain tensioner, remove the cap locking nut 1 ( see fig. 2-55 ), locknut 9 and spring ring 4, then remove plunger 7, spring 5 and rod...
Camshaft drive chain Rinse the chain in kerosene, and then check the condition of its links. On rollers and cheeks, chips, cracks and other damage are not allowed. When the engine is running, the...