Petrol models
Examination
Setting the basic position of the camshafts of gasoline engines M112 / 113
Details of the installation of cylinder head covers on gasoline engines M112 / 113 (on the example of M112)
1 - Upper engine trim panel with built-in air cleaner; 2 - Cover of the right cylinder head; 3 - Left cylinder head cover; 4 - Assembling the ignition coils of the right row of cylinders; 5 - Assembling the ignition coils of the left row of cylinders; 6 - Right breather; 7, 8 - Left breathers
1. Remove cylinder head covers.
2. To check the correct basic setting of the camshafts, turn the crankshaft in the normal direction and bring the piston of the first cylinder to the position 40°after TDC, the camshafts should turn into grooves (6) to the plane of symmetry of the engine and be freely fixed with locking rods.
Note. On models equipped with an air pump, the combination valve must be unscrewed before installing the right locking pin. Copper-plated chain segments (1) must match labels (4) on the camshaft sprockets - in order to achieve the desired result, it may be necessary to rotate the crankshaft up to 14 times.
3. Remove the chain tensioner.
4. Remove the Hall sensor.
5. Having lifted a chain, remove an asterisk at first right, then the left camshaft.
6. Using an open-end wrench, turn the left camshaft to the base position - the grooves turned to the plane of symmetry of the engine (6) must align with the joint line of the caps with the heads, - and fix it with a blocking plate (2), putting the latter flush with the left head and tucking it into the groove (6) camshaft.
In the position of the piston of the first cylinder 40°after TDC, the camshaft can be rotated without the risk of pistons colliding with the valves.
7. Acting in a similar manner, expose the right camshaft. Make the necessary adjustments if necessary (see below).
8. When refueling the chain, reinstall the camshaft sprockets (first left, then right).
9. Install the Hall sensor.
10. Install the chain tensioner.
11. Make sure that the alignment marks are correctly aligned, then reinstall the cylinder head covers.
12. Finally, check that the ignition timing is set correctly (see Section Checking the correct setting of the ignition timing on gasoline models).
Adjustment
Adjustment of the basic position of the camshafts on gasoline engines M112 / 113 (on the example of M112)
1. Remove the bearing cap bridge for the respective camshaft.
2. Pushing out the axle (3) with a punch (1) 15 mm diameter, remove rocker arms (2).
Note. To facilitate the removal of the rocker shaft, the bridge can be preheated and installed on a special frame (4).
3. Remove the drift (1) and fill in its place the guide shaft (Ø 16 or 18 mm), while planting rocker arms on it (2).
4. If necessary, preheat the bridge, and fill it with the axle of the rocker arms (3), pushing out the guide shaft with it - try not to bend the rocker arms aligned in the assembly.
5. Install the bridge assembly in its proper place.
Diesel models
M612
Checking the basic position of the camshafts of the M612 diesel engine
Installation details of the cylinder head cover of the M612 engine
1 - Panel trim cylinder head cover; 2 - Air distributor finishing panel; 3 - Breather pipe; 5 - Support bracket for wiring harness; 7 - Cylinder head cover; 8 - Sealing gasket; 9 - Sealing elements; В6/1 - Hall sensor; Y76 - Injectors
1. Remove nozzles (Y76) (see chapter Power supply and exhaust systems).
2. Remove the cylinder head cover.
3. Remove the viscous cooling fan (see chapter Refrigeration, heating, ventilation and air conditioning systems).
4. Having turned the crankshaft in the normal direction, bring the piston of the first cylinder to the TDC position, the marks of the camshaft and its bearing caps must be aligned.
5. Block the camshafts with a special rod (3), threaded through the hole in the cover of the first shaft bearing and tucked into the hole (A) in gear (2) intake camshaft.
6. With the correct basic label setting (IN) camshaft gears (1 and 2) should be combined. In addition, the marks applied to the shaft bodies and their bearing caps must be aligned (arrows).
7. If necessary, remove the camshafts and install them in place, achieving the correct alignment of the marks.
8. Reinstall the removed components in reverse order of removal.
9. Finally, read the DTCs and clear the OBD memory using the STAR DIAGNOSIS scanner (6511 1801 00) (see chapter Engine Electrical Systems).
M628
Setting the basic position of the camshafts of the 628 series engine
1 - Intake camshaft gear; 2 - Gear wheel of a final camshaft; 3 - Intake camshaft; 4 - Final camshaft; 5 - Chain tensioner; B - Setting marks
Installation details of the cylinder head covers of the M682 engine (1 of 2)
1, 4, 5 - Screws; 2 - Inlet air duct; 3 - Cylinder head cover; 3a - Sealing gasket; 6 - Cover; 7 - Drainage hose; 8 - Bolts; 9 - Fuel supply line; 10 - Fuel return line; 11 - Cylinder head; 12 - Support bracket; 13 - Vacuum hose; В2/6 - Left MAF sensor; В2/7 - Right MAF sensor; B6 / 1 - Camshaft Hall sensor; Y83 - Inlet port shut-off switch valve
Installation details of the cylinder head covers of the M682 engine (2 of 2)
5 - Screw; 5a - Bolt; 6 - Cover; 14— Left intake duct; 15— Right intake duct; 16 - Finishing panel of the left cylinder head; 17 - Panel trim right cylinder head; B28 - Pressure sensor; N14 / 2 - Output stage of the preheating system; N14/2x1—Connector for the electrical wiring of the output stage of the preheating system; N14/2x2 - Wiring connector for the output stage of the preheating system
1. Remove cylinder head covers.
2. Remove the intercooler (Intercooler) turbocharging systems (see chapter Power supply and exhaust systems).
3. Turning the crankshaft in the normal direction, bring the piston of the first cylinder to the TDC position.
4. Check the basic position of the camshafts - the gears must be turned with marks (IN) to each other, in addition, the marks applied to the bodies of the shafts and the covers of their bearings must be aligned (arrows).
5. If necessary, make the appropriate adjustment.
6. Reinstall the removed components in reverse order of removal.