If installed without special tools, there is a risk of damage to the camshafts. In addition, the valves can be bent when in contact with the piston crowns.
All valve actuator components such as bearing shells or belleville springs and toothed bushings on sprockets must be reinstalled in their original positions. To do this, they must be placed on a special pallet.
Models 320i, 323i, 328i (M52TU engine)
Withdrawal
1. Remove the air filter cover, refer to Section Removal and installation of the engine air filter.
2. Remove the spark plugs, refer to Section Spark plug.
3. Disconnect the crankcase ventilation pipe at the cylinder head cover of the pipeline".
4. Turn away bolts of fastening and remove a cover of a head of cylinders (arrows in the illustration). At the same time, pay attention to the rubber gaskets of the mounting bolts in order to install them correctly later.
5. Remove the fan/fan clutch, refer to Section Removing and installing a viscous fan.
6. Remove the intake camshaft cover.
7. Disconnect the oil line (arrow illustration) at the double block VANOS.
8. Instead of an oil line, connect compressed air to the double VANOS unit through a suitable adapter and supply air with a pressure of 2 to 8 bar.
This and the following operation is necessary in order to set the camshafts in their basic position.
9. Turn the crankshaft at least two turns clockwise with the VANOS block loaded. You can turn the crankshaft and, accordingly, the engine in one of the following ways:
- Shift the gearbox to neutral and apply the parking brake. Turn the crankshaft at the center pulley mounting bolt clockwise using the socket.
- Raise and place the vehicle on jack stands on the rear side. Engage fifth gear and release the parking brake. Rotate the raised rear wheel forward. At the same time, the crankshaft rotates
- Park the vehicle on level ground. Engage fifth gear. Move carefully or have the vehicle moved forward.
10. Set the crankshaft to the TDC position of the first cylinder. Cam tops (arrows in the illustration) intake and exhaust valves of the first cylinder (from the timing drive) should be facing up.
11. Fix the crankshaft in the TDC position with a BMW tool or other suitable rod. To do this, insert the rod into the hole in the cylinder block (arrow illustration) into the flywheel hole, having previously removed the plug in the cylinder block.
12. Remove the studs (arrows in the illustration).
13. Lock the camshafts with the BMW-11 3 240 tool shown in the illustration in the TDC position of the first cylinder. You can use the KLANI KL-0580-4 tool. The tool is installed through the hexagon of the camshafts and applied to the edge of the cylinder head.
14. Disconnect the compressed air from the VANOS block -4-.
After opening the screw plugs, oil flows out. Prepare a rag and container. Wipe off any oil that gets on the rubber elements and the V-belt immediately.
15. Turn out carving plugs -1- in an axis of camshafts of inlet and final valves, wipe the leaked oil.
16. Remove the covers -2- under the plugs with pliers.
17. Turn out the calibrated bolts -3- under covers.
18. Unscrew the eye (arrows in the illustration).
19. Disconnect the connector at the VANOS block.
20. Loosen the nuts (arrows in the illustration) and remove the VANOS block.
After removing the VANOS block, it is not allowed to crank the engine. The intake camshaft pinion may slip out of the spline connection and the valves will become uncontrollable and may hit the piston crown.
21. Turn out the chain tensioner (arrow illustration) at the cylinder head.
22. Press the upper chain tensioner at the connecting chain between the camshafts and fix in this position by inserting the tool BMW-11 3 292.
23. Turn away three nuts of fastening of the gauge on an asterisk of a camshaft of exhaust valves. Remove the sensor wheel from the belleville spring from the sprocket.
24. Turn away nuts of fastening (arrows in the illustration) on the intake camshaft sprocket. Remove the thrust washer from the sprocket.
Before loosening the exhaust camshaft sprocket nuts, circle the nuts with a felt-tip pen to secure the sprocket to its original position during installation. Otherwise, the sprockets can only be set correctly using the BMW special tool.
25. Turn away three bolts of fastening of an asterisk of a camshaft of final valves.
26. Remove both asterisks with a chain from camshafts.
27. Disconnect the upper chain tensioner (arrows in the illustration).
28. Disconnect the sprocket from the camshaft.
29. To remove the camshafts, BMW tool 11 3 260 is required. It is intended for all camshaft bearings in the installation position when the bearing shells are released. The removal procedure for both camshafts is the same, the removal sequence does not matter.
30. Turn out spark plugs. Install the tool and fix it in the threaded holes of the spark plugs of cylinders 1 and 4 with a torque of 25 Nm.
31. Turn the eccentric shaft in the direction of the arrow with a wrench and secure the bearing caps.
32. Loosen the bolts securing all bearing caps.
The cover of the first bearing of the intake camshaft is centered by bushings. To prevent misalignment of the camshaft, unscrew the bolts securing the cover of the first bearing and remove it.
33. Loosen the fixture and remove it.
34. Remove bearing caps and camshafts. Place the covers in the order in which they were installed on the engine. Installing the covers on the engine must be done in the same order. The exhaust camshaft bearing caps are marked A1 to A7, the intake camshafts are E1 to E7 (arrows in the illustration).
35. If necessary, for example, to remove the valves, remove the complete bearing bracket -2- with pushers. Pay attention to the centering sleeves -2-. Bearing bars in point "2" are marked "A" for the issuing side and "E" for the intake side.
The valve lifters can slide down from the bearing bar if they are not secured. For this purpose, BMW workshops use suction cups that can be mounted on top of the pusher and prevent slipping. Mark pushers. They must be installed in their original place if they were removed from the bar. 1 - cylinder head.
Do not place the removed pushers on the head for more than 10 minutes, otherwise engine oil will flow out of it and the automatic compensation of valve clearances will stop working.
VANOS block drive chain sprockets
1 - pulse sensor wheel
2 - Belleville spring
3 - thrust washer 3.5 mm
4 - toothed shaft
5 - asterisk
6 - TORX screw
7 - gear sleeve
8 - asterisk
9 - pin
10 - intake camshaft
11 - figured washer
12 - toothed shaft
13 - asterisk
14 - pin
15 - thrust washer
16 - pulse sensor wheel
17 - intake camshaft
Installation
Rotate the crankshaft approximately 30°against the direction of engine rotation before installing the camshafts (to the left behind the hexagon of the pulley) through the TDC. This way, none of the pistons will be at the top and the valves can be put in place. Valve lifters without load from the camshaft stretch and after installation take some time to shrink again. As a result, the valves can be opened more than the corresponding position of the camshaft and can sit on the pistons. Therefore, after installing the camshafts, it is necessary to wait 40 minutes until the engine can be cranked. Only after that it is possible to turn the crankshaft to the TDC position and install the timing chains, refer to subsection Installing the cylinder head.
1. Check up a surface of pushers, in the presence of defects replace. Install the camshafts so that the tops of the cams of the first cylinder point at each other.
2. Establish a level with bearings and the inserted pushers in a head of cylinders. Check for presence of centering bushes -3-.
3. Insert the bearing shells as marked. They should be in their original positions.
4. Insert the fixture and clamp the earbuds.
5. Tighten the camshaft bearings to 15 Nm.
6. Remove fixture.
7. Insert a ruler to fix the camshafts.
8. If necessary. Arrow - hexagon of the second camshaft.
Be careful not to damage the camshaft housing. Sand the outside of the wrench if necessary.
9. Fasten the sensor wheel and thrust washer to the intake camshaft with a torque of 20 Nm.
10. Install the sprocket on the exhaust camshaft. The arrow on the sprocket should point towards the top edge of the cylinder head.
11. The chain tensioner piston -1- is turned out. Screw the BMW tool - 11 4 220 into the thread of the tensioner.
The specified tool presses on the chain and pulls it a little so that the camshaft sprockets are in their working position. With some skills, such a tool can be made independently. In the absence of a tool, correct installation of the chain is not possible.
12. Lightly press the chain tensioner by turning the tensioning screw of the BMW tool - 11 4 220. The chain must not sag.
13. Set the sprocket on the exhaust camshaft. The arrow on the sprocket should point towards the top edge of the cylinder head.
14. Fasten the sprocket to the exhaust camshaft with three bolts to a torque of 28 Nm.
15. Attach the upper chain tensioner.
16. Insert the toothed sleeve -6-. In this case, the cavity of the teeth on the camshaft and the toothed sleeve must be opposite each other (arrows in the illustration).
17. Insert the gear shaft so that the sprocket mounting bolts lie in the center of the oval holes in the gear bushing.
18. Put the upper chain on the sprockets and set according to the markings made during removal. If new parts are installed, transfer markings from old parts to them.
19. Put on the top chain with both asterisks on camshafts. At the same time, tooth cavities (arrow illustration) on the intake camshaft and on the sprocket must be opposite each other. Insert the toothed shaft -4- with the pins into the cavities of the teeth and press in.
20. Slightly pull out the toothed shaft -4- again so that 1 mm of the tooth width is visible.
21. Install the thrust washer on the intake camshaft sprocket so that the inscription can be read "FRONT". Screw on the sprocket mounting nuts until they fit, but do not tighten them.
22. Fasten the camshaft sprocket by tightening the nuts to 5 Nm, and then loosen them again by half a turn.
23. Install the thrust washer on the intake camshaft sprocket so that the inscription is visible "F". If the inscription is not visible, pay attention to the installation direction of the thrust washer: The large bearing diameter must point in the direction of the camshaft.
24. Install the sensor wheel on the exhaust camshaft sprocket. The arrow on the wheel must point outward towards the top edge of the cylinder head.
25. Pull out the gear shaft on the exhaust camshaft sprocket until it stops.
26. Press the upper chain tensioner with your hand and remove the BMW fixing tool.
27. Tension the chain by turning the tension screw of the BMW-11 4 220 tool with a torque of 0.7 Nm.
28. Clean the sealing surface of the VANOS block from oil and dirt. Check the presence of guide bushings -1-.
29. Attach tool BMW-11 6 150 -1- (arrows in the illustration). With this tool, the gear bushings are fixed when the sprockets are tensioned.
30. Press three nuts -2- and -3- to both sprockets first with a torque of 5 Nm without tightening them.
31. Tighten the bolts -4- in the grooves to 22 Nm.
32. Tighten nuts -2- and -3- to 22 Nm.
33. Disconnect the tool BMW-11 6 150.
34. Seal the corners of the sealing surface between the cylinder head and the VANOS block with sealant "Drei Bond 1209" or "Loctite Ultra Black".
35. Replace the VANOS block gasket. Fasten block (arrows in the illustration). Tighten the M6 nuts to 10 Nm and the M6 nuts to 22 Nm.
36. Dock the connector at the VANOS block.
37. Screw in the guide bolts at the intake and exhaust camshafts and tighten to 10 Nm.
38. Replace the covers under the screw plugs and insert them with pliers.
39. Wrap the threaded plugs with new sealing rings at the camshafts inlet and outlet valves and tighten to 50 Nm.
40. Bolt the engine lug from the front.
41. Remove the special tool for fixing the camshaft and crankshaft.
42. Connect the compressed air line with an adapter and supply air with a pressure of 2 - 8 bar.
43. Turn the crankshaft clockwise for at least two turns and the VANOS block loaded with air.
44. Set the engine to the TDC position of the first cylinder. Tops of cams of inlet and final valves of the first cylinder (arrows in the illustration) should be facing up at the same time.
45. Re-insert the rod to fix the crankshaft.
46. Re-insert the rod to fix the camshaft.
The ruler for fixing the camshafts can rise 1 mm above the intake camshaft. If the ruler on the side of the exhaust manifold is high, it is necessary to adjust the gas distribution mechanism by turning the camshaft sprockets. To do this, loosen the sprockets on the camshafts, turn them and then re-fasten them with a torque of 22 Nm.
47. Remove the ruler to fix the camshafts.
48. Remove the compressed air connection from the VANOS block. Fasten the oil line to the VANOS block with new seals to 30 Nm. Plug in the connector.
49. Turn out the tool BMW-11 4 220 at the chain tensioner.
50. Turn out the piston of a chain tension with a new sealing ring the moment of 70 Нм.
51. Screw in a finger of a cover of a head of cylinders.
52. Install the intake camshaft cover.
53. Lubricate the mating surfaces between the VANOS block and the cylinder head with sealant, for example, "Drei Bond 1209" or "Loctite Ultra Black".
54. Lubricate the transitions to the semicircles of the sealing surface to the cylinder head cover with the same sealant.
55. Install the cylinder head covers. Replace damaged gaskets, refer to the accompanying illustration. When installing the cylinder head cover gasket, pay special attention to the correct position in the semicircles of the end face of the cylinder head. Crimp the cover evenly with a torque of 10 Nm.
56. Insert the cylinder recognition sensor and secure it. If the sealing ring is damaged, replace it.
57. Install spark plugs, refer to Section Spark plug.
58. Install the exhaust manifold and downpipe, refer to Section Removal and installation of a final collector.
Before starting the engine, remove the TDC pin in the flywheel. Reinstall the plug in the hole on the cylinder block.
59. Install the crankcase ventilation connection on the cylinder head cover and secure it.
60. Install fan/fan clutch, refer to Section Removing and installing a viscous fan.
61. Install the air filter housing, refer to Section Removal and installation of the engine air filter.
Model 320d (M47 engine)
Withdrawal
Operations and instructions applicable to all engines are given in Section 316i, 318i. This Section only lists differences that apply to the 320d engine.
1. Remove the vacuum pump, refer to the relevant section.
2. Remove the cylinder head cover, refer to Section Removal and installation of a head of cylinders / replacement of a sealing lining.
3. Fix the crankshaft in the TDC position with a BMW-11 2 300 tool or other appropriate rod. To do this, insert the rod through the hole in the cylinder block above the starter into the hole in the flywheel.
4. Lock the chain tensioner in the compressed position. To do this, unscrew the hexagon socket screw in the area of the end wall of the cylinder block (arrow illustration) and insert a BMW -11 3 340 rod or other suitable rod.
5. Turn away bolts of fastening and remove the top directing chain.
6. Turn away bolts of fastening and remove both sprockets of camshafts. While doing this, hold the shafts by the hexagon. To fix the intake camshaft, the BMW workshop uses the tool BMW -11 6 320.
7. Turn away bolts of fastening and remove covers of bearings of camshafts. Put them in order of installation. Take out camshafts.
8. Take out rocker arms from a head of cylinders and also put them on the engine in an installation order. The tightening torques are given in Specifications.