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To dismantle the engine

To dismantle the engine


1. Remove the bracket for the engine wiring harness.


2. Remove the support bearing bracket with pipe and inboard drive shaft universal joint.


3. Disconnect the starter motor and remove same.

4. Remove the plastic plug under the starter motor and remove the torque converter bolts.

Advance the torque converter gradually by turning the crankshaft with the pulley.

5. Prevent the torque converter from moving by means of 87 92 574 Holder .

6. Remove the gearbox.

7. Remove the front exhaust pipe with heated oxygen sensor, power steering pump and power unit from the subframe.

8. Fit Holder part no. 83 94 751 to the power train and lift over the power train to 78 74 878 Floor stand .


9. Remove the belt tensioner and disconnect and remove the generator.

Do not forget to remove the lead to the oil pressure sensor from the generator.

10. Detach the vacuum hose and water hoses from the throttle. Also unplug the throttle's connector.


11. Detach the temperature sensor on the coolant bridge.

12. Remove the upper intake manifold.


13. Disconnect the leads to the injectors. Remove the middle intake manifold.

14. Remove the lower intake manifold. Plug the induction orifices.

15. Disconnect the lead to the oil pressure sensor.


16. Drain the oil and tighten the drain plug.

Tightening torque: 25 Nm (18.5 lbf ft).

17. Remove the dipstick.


18. Remove the turbo's water and oil pipes.

19. Remove the turbo's bracket.

20. Remove the crankshaft position sensor.

21. Remove the oil filter and the oil pipes from the oil filter adapter.

22. Remove the rear exhaust manifold's heat shield. Remove the rear exhaust manifold.


23. Remove the front exhaust manifold.


24. Detach the coolant pipe and remove the thermostat housing with thermostat.


25. Remove the coolant bridge, being careful not to damage the gaskets.

26. Remove the crankcase breather housing.

27. Disconnect the leads to the ignition discharge modules and remove the engine wiring harness. Remove the ignition discharge modules.


28. Remove the spark plugs using Spark plug socket part no. 83 95 485, and also remove the camshaft covers with gaskets.

29. Remove the coolant pump pulley and crankshaft pulley.


30. Remove the timing cover.

31. Zero the engine. Mark the direction of rotation on the timing belt and undo the belt tensioner. Remove the timing belt. Rotate the crankshaft to 60° BTDC.


Warning

The camshafts must not be rotated as the valves may collide with the pistons or each other and be damaged. The crankshaft may be rotated only between 0° and 60° before top dead centre when the camshafts on both cylinder heads are secured with a locking tool.


32. Remove the bracket with tensioning roller and the upper adjuster roller.

33. Remove the lower adjuster roller.

34. Hold the camshafts with a spanner and remove the camshaft sprockets.


Warning

The jaws of the open-ended spanner used as a counterstay when removing the camshaft sprockets must not be too long. There is otherwise a risk of damaging the metal so that the tappets become locked.


35. Remove the coolant pump, taking care not to damage the O-ring.

Note

There is quite a lot of coolant left in the engine so always place a receptacle under the engine to collect it.


36. Remove the inner timing cover.

37. Remove the exhaust camshaft bearing caps by undoing the bolts in steps of 1/2 to 1 turn. It is important to conclude removal at the bearing cap where the tappets are under load. Lift out the camshafts and remove the stuffing boxes. Note the marking on the camshaft bearing caps.


Important

The camshafts must come away from the bearing seats evenly.


Note

The intake camshafts can remain in place.


38. Remove the tappets and keep them in 83 93 787 Valve stand so that they are kept in order. Fit Protective collars part no. 83 95 022.

39. Undo the cylinder head bolts in the order shown in steps of 1/4 - 1/2 a turn. Remove the cylinder heads. Exercise care when putting them down as the intake camshafts are still in place and the valves could easily be bent through carelessness.

40. Detach the pipes from the heat exchanger, being careful with the gaskets. Remove the heat exchanger cover complete with the heat exchanger.


Important

Not the fitting position.


41. Mark the pistons with the cylinder number.

42. Turn the engine. Remove the oil sump, oil suction pipe and antislosh baffle.


43. Fit Counterstay 83 95 063 and remove the camshaft belt sprocket from the crankshaft. Remove the oil pressure sensor.


44. Remove the oil pump and gasket.

45. Remove the front crankshaft seal.

46. Remove the drive plate. Carefully prise out the rear crankshaft seal.


Important

Do not damage the sealing surface.


47. Undo all big-end bearing caps and press or carefully tap the pistons out of the cylinders in pairs. Start with 1 and 2.


48. Remove the main bearing member by first undoing the middle bolts on the long sides and unscrewing the adjusting sleeves about 1/2 a turn.

Note

If the adjusting sleeves are tight-fitting, they need not be unscrewed.


49. Remove the rest of the bolts. Note the position of the main bearing member for subsequent reassembly.

50. Remove all main bearing caps and lift out the crankshaft.


51. Remove the slotted ring.

Important

Observe the utmost care when handling the slotted ring.


52. Remove all bearing shells for both the main bearings and big-end bearings.