Repair of 4-cylinder engine BMW 3 Series E21
Main technical characteristics
The four-stroke, four-cylinder, in-line engine is mounted along the longitudinal axis of the car with an inclination at an angle of 30°. The engine uses a...
The four-stroke, four-cylinder, in-line engine is mounted along the longitudinal axis of the car with an inclination at an angle of 30°. The engine uses a...
Cylinder head characteristics
The cylinder head is cast from aluminum alloy. The head has three-spherical combustion chambers. Seats and valve guides are pressed into the cylinder head....
The cylinder head is cast from aluminum alloy. The head has three-spherical combustion chambers. Seats and valve guides are pressed into the cylinder head....
Characteristics of the block of cylinders
The cylinder block is cast from special gray cast iron and is one piece with the cylinders. Cylinder diameters Ovality and taper of cylinder mirrors, mm, not...
The cylinder block is cast from special gray cast iron and is one piece with the cylinders. Cylinder diameters Ovality and taper of cylinder mirrors, mm, not...
Characteristics of the crank mechanism
Pistons Pistons are cast from aluminum alloy. Depending on the engine model, the piston crowns may be flat or convex. Pistons make: Mahle, Karl Schmidt (KS) or...
Pistons Pistons are cast from aluminum alloy. Depending on the engine model, the piston crowns may be flat or convex. Pistons make: Mahle, Karl Schmidt (KS) or...
Characteristics of the gas distribution mechanism
The engine uses a valve timing mechanism with an overhead camshaft, which is driven by a two-row roller chain. Chain tension is automatically adjusted by a...
The engine uses a valve timing mechanism with an overhead camshaft, which is driven by a two-row roller chain. Chain tension is automatically adjusted by a...
Tightening torques for main threaded connections
Tightening torques for threaded connections, kgf·m Bolts of fastening of a head of cylinders on the cold engine: 1st reception: 3,4-4,4; 2nd reception:...
Tightening torques for threaded connections, kgf·m Bolts of fastening of a head of cylinders on the cold engine: 1st reception: 3,4-4,4; 2nd reception:...
Valve clearance adjustment
The gaps in the valve drive mechanism are adjusted by turning the adjusting eccentric of the rocker, after loosening the lock nut. The clearances in the valve...
The gaps in the valve drive mechanism are adjusted by turning the adjusting eccentric of the rocker, after loosening the lock nut. The clearances in the valve...
Removing the cylinder head
Remove the air filter. Disconnect the wires from the battery terminals. Disconnect the radiator outlet hose and drain the coolant. Disconnect the cooling...
Remove the air filter. Disconnect the wires from the battery terminals. Disconnect the radiator outlet hose and drain the coolant. Disconnect the cooling...
Disassembly of the cylinder head
Cylinder Head Details: 1 - cylinder head; 2 - cylinder head gasket; 3 - cylinder head cover; 4 — laying of a cover of a head of cylinders; 5 - breather; 6 -...
Cylinder Head Details: 1 - cylinder head; 2 - cylinder head gasket; 3 - cylinder head cover; 4 — laying of a cover of a head of cylinders; 5 - breather; 6 -...
Cylinder head repair
Replacing valve guides If the valve guides are excessively worn (limiting dimensions for wear, see subsection « Detailed Specifications »), replace the valve...
Replacing valve guides If the valve guides are excessively worn (limiting dimensions for wear, see subsection « Detailed Specifications »), replace the valve...
Cylinder head assembly
Thoroughly clean and check the condition of the parts. Reassembly of the cylinder head is carried out in the reverse order of disassembly, taking into account...
Thoroughly clean and check the condition of the parts. Reassembly of the cylinder head is carried out in the reverse order of disassembly, taking into account...
Installing the cylinder head
After cleaning the mating surface of the cylinder block, check the protrusion of the dowel pins above its plane, which should not exceed 5 mm. Make sure that...
After cleaning the mating surface of the cylinder block, check the protrusion of the dowel pins above its plane, which should not exceed 5 mm. Make sure that...
Removal and installation of the engine
Withdrawal Remove the gearbox. Remove the engine cooling radiator. Disconnect the wire from the terminal «—» battery. On vehicles with power steering, unscrew...
Withdrawal Remove the gearbox. Remove the engine cooling radiator. Disconnect the wire from the terminal «—» battery. On vehicles with power steering, unscrew...
Cylinder Block Parts
Cylinder Block Details: 1 - cylinder block; 2 - plugs; 3 — the holder of a back epiploon of a cranked shaft; 4 - gasket; 5 - remote washer; 6 — a back epiploon...
Cylinder Block Details: 1 - cylinder block; 2 - plugs; 3 — the holder of a back epiploon of a cranked shaft; 4 - gasket; 5 - remote washer; 6 — a back epiploon...
Details of the crank mechanism
Details of the crank mechanism: A - engines of cars of all models except «320» And «320i»; B - engine models of cars «320» And «320i» 1 - crankshaft; 2 -...
Details of the crank mechanism: A - engines of cars of all models except «320» And «320i»; B - engine models of cars «320» And «320i» 1 - crankshaft; 2 -...
Engine disassembly
Install the washed and cleaned engine on a turntable for disassembly. Remove the cylinder head as above. Remove the protective cover and exhaust manifold....
Install the washed and cleaned engine on a turntable for disassembly. Remove the cylinder head as above. Remove the protective cover and exhaust manifold....
Disassembly of the connecting rod and piston group
The piston pins rotate freely in the upper head of the connecting rod and the piston bosses. From longitudinal movements, the pin is held in the piston bosses...
The piston pins rotate freely in the upper head of the connecting rod and the piston bosses. From longitudinal movements, the pin is held in the piston bosses...
Checking the technical condition of the parts of the connecting rod and piston groups
Make sure the connecting rods are in the same weight group: connecting rods without bearing shells should not differ in weight by more than±4 g. Check the...
Make sure the connecting rods are in the same weight group: connecting rods without bearing shells should not differ in weight by more than±4 g. Check the...
Installing the crankshaft
Make sure that the crankshaft journals and main bearing shells are the same size group. Color indexes (red or blue) on the main bearing shells must be...
Make sure that the crankshaft journals and main bearing shells are the same size group. Color indexes (red or blue) on the main bearing shells must be...
Replacing the centering bearing with grooves of the gearbox input shaft
Press the bearing with shield, felt ring and protective cap out of the crankshaft flange seat using a puller «Kikko». Thoroughly clean and blow out the bearing...
Press the bearing with shield, felt ring and protective cap out of the crankshaft flange seat using a puller «Kikko». Thoroughly clean and blow out the bearing...
Needle bearing replacement
Press the bearing out of the crankshaft flange socket with a puller. Thoroughly clean and blow out the bearing housing in the crankshaft flange with compressed...
Press the bearing out of the crankshaft flange socket with a puller. Thoroughly clean and blow out the bearing housing in the crankshaft flange with compressed...
Replacing the flywheel gear rim
Check the condition of the flywheel gear rim and, in case of significant tooth wear, replace the gear rim. Drill a hole approximately 8mm deep in the rim just...
Check the condition of the flywheel gear rim and, in case of significant tooth wear, replace the gear rim. Drill a hole approximately 8mm deep in the rim just...
Flywheel grinding
The contact surface of the clutch disc on the flywheel must be smooth, without scratches and gaps. Risks and gaps are removed by grinding. After grinding...
The contact surface of the clutch disc on the flywheel must be smooth, without scratches and gaps. Risks and gaps are removed by grinding. After grinding...
Checking the clearance between the liners and the main journals of the crankshaft
Install the lubricated lower main bearing shells into the cylinder block seats (axial fixation of the crankshaft is provided by inserts with cheeks of the...
Install the lubricated lower main bearing shells into the cylinder block seats (axial fixation of the crankshaft is provided by inserts with cheeks of the...
Checking the axial clearance of the crankshaft
Install the crankshaft rear oil seal holder with a new gasket. Install the flywheel on the crankshaft. Block the flywheel with a retainer and tighten the new...
Install the crankshaft rear oil seal holder with a new gasket. Install the flywheel on the crankshaft. Block the flywheel with a retainer and tighten the new...
Checking the clearance between the liners and connecting rod journals of the crankshaft
Insert pistons into cylinders (without piston rings) with connecting rods according to the cylinder number marks on the piston crown (counting is done from the...
Insert pistons into cylinders (without piston rings) with connecting rods according to the cylinder number marks on the piston crown (counting is done from the...
Installing the camshaft drive
Slide the pulley onto the toe of the crankshaft without tightening the pulley mounting nut. Set the piston of the 1st cylinder to the TDC position at the end...
Slide the pulley onto the toe of the crankshaft without tightening the pulley mounting nut. Set the piston of the 1st cylinder to the TDC position at the end...
Details of the gas distribution mechanism
Details of the gas distribution mechanism: 1 - covers of the gas distribution mechanism; 2 - mounting sleeve; 3 - gaskets for covers of the gas distribution...
Details of the gas distribution mechanism: 1 - covers of the gas distribution mechanism; 2 - mounting sleeve; 3 - gaskets for covers of the gas distribution...
Adjusting the tension of the drive belts and power steering pump
Normal deflection when pressing the branch between the generator and fan pulleys with the thumb for the generator drive belt and when pressing the middle of...
Normal deflection when pressing the branch between the generator and fan pulleys with the thumb for the generator drive belt and when pressing the middle of...
Engine suspension elements
Engine Mount: A - before the 1979 model year; B - since the 1979 model year. 1 - right suspension bracket; 2 - left suspension bracket; 3 - support; 4 -...
Engine Mount: A - before the 1979 model year; B - since the 1979 model year. 1 - right suspension bracket; 2 - left suspension bracket; 3 - support; 4 -...
Exhaust gas exhaust system
Exhaust system: 1 - exhaust manifold; 2 - protective cover; 3, 5 - gaskets; 4 — a reception pipe of mufflers; 6 — an arm of fastening of a receiving pipe; 7 -...
Exhaust system: 1 - exhaust manifold; 2 - protective cover; 3, 5 - gaskets; 4 — a reception pipe of mufflers; 6 — an arm of fastening of a receiving pipe; 7 -...
This section is available on russian, bulgarian, belarusian, ukrainian, serbian, croatian, romanian, polish, slovak, hungarian
Similar sections for other types of BMW cars:
Power unit: Engine repair BMW 5 Series E34 (1988-1996)
Power unit: M67 engine (diesel) BMW 7 Series E38 (1994-2001)
M54 petrol engine: Engine repair BMW X5 E53 (1999-2006)
Power unit: Engine repair BMW 5 Series E34 (1988-1996)
Power unit: M67 engine (diesel) BMW 7 Series E38 (1994-2001)
M54 petrol engine: Engine repair BMW X5 E53 (1999-2006)
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