Checking the basic position of the balance shaft (112 series engines)
1. Illustrative material for checking the basic position of the balance shaft on 112 series engines is presented in the illustration, to which all references in the text refer.
2. Remove the transmission assembly (see Chapter Automatic transmission).
3. Remove the drive disc (see Section Removal and installation the flywheel/drive disc).
4. Remove the cylinder head covers.
5. On engines equipped with an air pump, remove the right combination valve.
Note: The combination valve sealing gasket must be replaced.
6. Rotate the engine to the position 40° after TDC of the piston of the first cylinder.
7. Check the basic position of the camshafts (see Section Setting the base position of the camshafts).
8. Install the locking plates (2) on the right and left cylinder heads, inserting them into the grooves (1) of the camshafts.
9. When the balance shaft is correctly installed, the hole (3) in the rear counterweight (4) should align with the socket in the engine crankcase - insert a pin with a diameter of 8.40÷8.55 mm into the holes. Also make sure that the mark (B) on the front counterweight aligns with the pin (A) in the crankcase - the mark and pin are located approximately 22 cm below the mating surface of the head and are visible through the window in the left timing belt cover.
10. If the basic setting is not correct, the balance shaft must be replaced.
11. Reinstall all removed components in the reverse order of removal.
(Original article is on the portal: «MercedesMAN.ru»)