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Remove/install cylinder heads (V12) - RA01001204150X(01-4150)

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Preceding work:

Model 140 only: Engine removed (01-0300) .

Front covers removed 01-2120 .

Chain tensioner removed (05-3100) .

Guide rail housing removed (05-3500) .

Operation no. of operation texts and work units or standard texts and flat rates

01-5800 

Fig 1: Identifying Cylinder Head Remove/Install Components (1 Of 4)
G04676952Courtesy of MERCEDES-BENZ OF NORTH AMERICA.
Left cylinder head: Ventilation pipe (19) remove, install (01 -0450).
Left cylinder head: Guide rail pins pull off with impact extractor 116 589 20 33 00, install (step 2).
Secondary air injection lines (1 and 2) unbolt, bolt on.
Model 129: Exhaust system at exhaust manifolds unbolt, bolt on.
Model 129: Exhaust system at carrier for exhaust bracket at transmission unbolt, bolt on.
Model 129, left cylinder head: Exhaust pipe (22) at front manifold remove, install (step 7).
Fig 2: Identifying Cylinder Head Remove/Install Components (2 Of 4)
G04676953Courtesy of MERCEDES-BENZ OF NORTH AMERICA.
Fig 3: Identifying Cylinder Head Remove/Install Components (3 Of 4)
G04676954Courtesy of MERCEDES-BENZ OF NORTH AMERICA.
Model 140, right cylinder head: Air cleaner (5) of secondary air pump remove, install.
Right cylinder head: Dipstick guide tube (6) at oil pan unbolt, turn to the side, install.
Right cylinder head: Dipstick guide tube of automatic transmission (7) remove, install (step 9).
Right cylinder head: Crankcase ventilation (8) unbolt, bolt on (step 10).
Fig 4: Identifying Cylinder Head Remove/Install Components (1 Of 4)
G04676955Courtesy of MERCEDES-BENZ OF NORTH AMERICA.
Model 140: Exhaust manifold at crankcase unbolt, bolt on (step 11).
Coolant at crankcase drain (step 12).
Model 129: Coolant hose (9) at rear of cylinder head take off, fit on (step 13).
Coolant hose (10) at rear of cylinder head take off, fit on (step 14).
Cylinder head bolts (11) on cylinder head to be removed unscrew, screw on (step 15).
Bracket (12) 104 589 00 40 00 fit on in place of camshaft bearing caps (13) at cylinder head to be removed, take off (step 16).
Engine hoist attach to bracket (12) 104 589 00 40 00 and to rear engine suspension point, detach.
Cylinder heads (14 and 16) take off, fit on.
Cylinder head contact surface examine.
Cylinder head gaskets (17 and 18) replace (step 19).
Cylinder head bolts (11) examine, tighten (steps 20 to 23).
Basic setting of camshafts check (05 -2230).
Oil level of automatic transmission check, adjust to correct level.
CYLINDER HEAD BOLTS (INTERNAL TWELVE-POINT)

Thread dia. D M 12
Thread length a 70 mm
Bolt length L when new 168 mm
max. bolt length 171 mm
Fig 5: Identifying Cylinder Head Bolt Length
G04676956Courtesy of MERCEDES-BENZ OF NORTH AMERICA.
TIGHTENING TORQUE SPECIFICATION 1)

Cylinder head bolts on cold engine 1st stage 55
  2nd stage, 90° tightening angle  
  3rd stage, 90° tightening angle  
Bolts of camshaft bearing caps   21
1) Thread and contact surface of bolts as well as washers moistened with engine oil before installing.

Special tools 

Fig 6: Identifying Special Tool (116 589 20 33 00 05)
G04676957Courtesy of MERCEDES-BENZ OF NORTH AMERICA.
Fig 7: Identifying Special Tool (001 589 66 21 00 00)
G04676958Courtesy of MERCEDES-BENZ OF NORTH AMERICA.
Fig 8: Identifying Special Tool (001 589 65 09 00 03 07 32)
G04676959Courtesy of MERCEDES-BENZ OF NORTH AMERICA.
Fig 9: Identifying Special Tool (617 589 00 10 00 01)
G04676960Courtesy of MERCEDES-BENZ OF NORTH AMERICA.
Fig 10: Identifying Special Tool (104 559 00 40 00 01)
G04676961Courtesy of MERCEDES-BENZ OF NORTH AMERICA.
Fig 11: Identifying Special Tool (116 589 01 34 00 05)
G04676962Courtesy of MERCEDES-BENZ OF NORTH AMERICA.
Fig 12: Identifying Special Tool (000 589 01 10 00 00)
G04676963Courtesy of MERCEDES-BENZ OF NORTH AMERICA.
NOTE: Remove cylinder heads together with camshafts and exhaust manifolds once engine has cooled down.

Rotate crankshaft 30° after ignition TDC on cylinder 1 (arrow).

In this position, the camshafts can be rotated without the valves coming into contact with the piston crowns.

Fig 13: Identifying Engine Setting Point
G04676964Courtesy of MERCEDES-BENZ OF NORTH AMERICA.

Mark all four camshaft sprockets and the timing chain to each other with dots of paint (arrows).

Fig 14: Locating Dots On Camshaft Sprockets And Timing Chain
G04676965Courtesy of MERCEDES-BENZ OF NORTH AMERICA.

Removing, installing 

  1. Left cylinder head: Remove ventilation pipe (5) (01 -0450).
    Fig 15: Identifying Ventilation Pipe
    G04676966Courtesy of MERCEDES-BENZ OF NORTH AMERICA.
  2. Left cylinder head: pull off guide rail pin (1) with impact extractor 116 589 20 33 00 and threaded insert 116 589 01 34 00.

    Installation note 

    The thread in the guide rail pin (arrow) must be positioned to the front (in direction of travel) when installed.

  3. Model 140: Unbolt air cleaner of secondary air injection, remove.
  4. Unbolt lines of secondary air injection. Right cylinder head: 1 cylinder head bolt, 1 engine carrier bolt, model 140: 1 oil pan bolt.

    Left cylinder head: 1 cylinder head bolt, 1 crankcase bolt below front exhaust manifold, model 140: 1 bolt on left engine carrier.

    Installation note 

    Replace gaskets.

    Fig 16: Identifying Guide Rail Pin
    G04676967Courtesy of MERCEDES-BENZ OF NORTH AMERICA.
  5. Model 129: Unbolt exhaust system at exhaust manifolds (49 -0045, 49 -0170).
  6. Model 129: Unbolt exhaust system at carrier of exhaust bracket at transmission.
  7. Model 129, left cylinder head: Unbolt exhaust pipe at front manifold in order to gain access to the drain plug in the crankcase.
  8. Unbolt dipstick guide tube from oil pan, turn to the side.

    Installation note 

    Replace O-ring according to condition.

  9. Right cylinder head: Unbolt dipstick guide tube (7) of automatic transmission at crankcase (arrow) and at automatic transmission.
    NOTE: Seal hole of guide tube at automatic transmission.
  10. Right cylinder head: Unbolt crankcase ventilation line (8) from right cylinder head (arrow).
    Fig 17: Identifying Crankcase Ventilation Line
    G04676968Courtesy of MERCEDES-BENZ OF NORTH AMERICA.
  11. Model 140: Unbolt exhaust manifold at rear of crankcase (arrow).
    Fig 18: Locating Exhaust Manifold Bolt
    G04676969Courtesy of MERCEDES-BENZ OF NORTH AMERICA.
  12. Drain coolant at crankcase; to do this, unscrew hexagon socket bolts (arrow) with seal next to left and right engine carriers. Tightening torque 30 Nm.
    Fig 19: Locating Hexagon Socket Bolt
    G04676970Courtesy of MERCEDES-BENZ OF NORTH AMERICA.
  13. Model 129: Take off coolant hose (9) at rear of cylinder head.
  14. Take off coolant hose (10) at rear of cylinder head.
    Fig 20: Identifying Coolant Hoses
    G04676971Courtesy of MERCEDES-BENZ OF NORTH AMERICA.
  15. Slacken cylinder head bolts on cylinder head to be removed in stages in the reverse order of tightening diagram, beginning at 14, with engine cold.
    Fig 21: Identifying Removal Sequence Of Cylinder Head Bolts
    G04676972Courtesy of MERCEDES-BENZ OF NORTH AMERICA.
  16. Install bracket 104 589 00 40 00 at the cylinder head to be removed.

    Unbolt 1st camshaft bearing cap of exhaust camshaft on the right cylinder head and install bracket with dowel sleeves (18a).

    Unbolt 2nd camshaft bearing cap of exhaust camshaft on left cylinder head and install bracket with dowel sleeves (18a), tightening torque 21 Nm.

  17. Attach engine hoist to bracket and to rear engine suspension point, lift and remove.

    IMPORTANT

    Do not damage tensioning rail or guide rail.

    Fig 22: Identifying Bracket And Dowel Sleeves
    G04676973Courtesy of MERCEDES-BENZ OF NORTH AMERICA.
  18. Examine cylinder head contact surface.
  19. Install cylinder head gasket.

    Installation note 

    Pay attention to dowel pins (1) and dowel sleeves (2) for locating the cylinder head on the crankcase.

    Fig 23: Identifying Dowel Pins And Dowel Sleeves
    G04676974Courtesy of MERCEDES-BENZ OF NORTH AMERICA.
  20. Examine cylinder head bolts. The cylinder head bolts are subjected to a permanent stretch each time they are tightened. If the maximum length (L) of 171 mm (when new 168 mm) is reached before next tightening, the bolts should be scrapped and replaced by new ones.
  21. Clean threaded holes.

    IMPORTANT

    Free of oil and water.

  22. Oil the thread of the cylinder head bolts and the contact surface of the head and insert.
    Fig 24: Identifying Cylinder Head Bolt Length
    G04676975Courtesy of MERCEDES-BENZ OF NORTH AMERICA.
  23. Tighten cylinder head bolts in stages in the order of the tightening diagram, starting with 1.

    1st tightening stage 55 Nm  .

    2nd tightening stage 90° tightening angle  .

    3rd tightening stage 90° tightening angle  .

    IMPORTANT

    The cylinder head gaskets are not watertight until the engine has reached its normal operating temperature, in other words until a swelling has occurred. For this reason, the cooling system must not be pressure-tested until after the engine has reached its operating temperature.

    Fig 25: Identifying Tightening Sequence Of Cylinder Head Bolts
    G04676976Courtesy of MERCEDES-BENZ OF NORTH AMERICA.
  24. Install in the reverse order.
  25. Check basic setting of camshafts (05-2230) .
  26. Check oil level of automatic transmission, adjust to correct level.
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