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Install / gauge the crankshaft bearings - AR03.20-P-4341-01CV

Modification notes

27.2.04 Figure modified from 30 Nm and 90 ≤° to 5 Nm, 30 Nm and 90 ≤° Figure in BA03.20-P-1003-01D of engine 112, 113 modified *BA03.20-P-1003-01D 
10.3.04 Figure changed from 0.030...0.052 mm to 0.026...0.050 mm Value modified in BE03.20-P-1001-04E on engine 112 except 112.951, 113.940/941/942/943/944/948/ 960/961/963/965/966/967/968/980/981 / 984/986 *BE03.20-P-1001-04E 
10.3.04 Figure changed from 0.030...0.052 mm to 0.026...0.050 mm Value modified in BE03.20-P-1001-04E for engine 113.992 *BE03.20-P-1001-04E 
Inspection data of crankshaft bearing clearance

Number Designation Engine 112 except 112.951/976, Engine 113.940/941/ 942/943/944/ 948/960/961/ 963/964/965/ 966/967/968/ 971/980/981/ 984/986 Engine 113.987/988/989 /990/991/993 Engine 113.992/995
BE03.20-P-1001-04E Main bearing play radial when new mm 0.026...0.050 0.026...0.050 0.026...0.050
axial when new mm 0.10...0.266 0.10...0.266 0.10...0.266
TORQUE SPECIFICATION Crankshaft bearing cap

Number Designation Engine 112,113
BA03.20-P-1001-01D Bolt for crankshaft bearing cap M8 Stage 1 Nm 20
Stage 2 ∠° 90
BA03.20-P-1002-01D Side bolt for crankshaft bearing cap M8   Nm 30
BA03.20-P-1003-01D Bolt for crankshaft bearing cap M10 Stage 1 Nm 5
Stage 2 Nm 30
Stage 3 ∠° 90
  1. Blow through oil galleries in direction of flow oil with compressed air.
  2. Clean the bearing points in the crankcase, main bearing cap and main bearing journal of crankshaft with a chamois leather.

    IMPORTANT If a bearing damage has occurred, it may be necessary to remove any swarf from the connecting rod bores, oil ducts, the crankshaft and crankcase casings as well as the crankcase! Do not use any hard objects for cleaning.

    IMPORTANT The top bearing shell halves (1) are assigned to the basic journal of the crankshaft by means of a colored ring on the rear of the upper bearing shell half (1) and numbers (arrows) or center punch marks, which are stamped into the crankcase.

    Only assigned color and numerical combinations (see table) may be fitted together.

    Fig 1: Identifying Bearing Points In Crankcase
    G04605689Courtesy of MERCEDES-BENZ OF NORTH AMERICA.
    Assignment of crankshaft bearing shell top halves (crankcase) M 112,113
    Diameter Main bearing bore in crankcase Number or chisel punches Color coding for bearing shell Order index Main bearing play (mm)
    68.500-68.506 1 blue 52 0.030 - 0.052
    68.506-68.513 2 yellow 54 0.030 - 0.052
    68.513-68.519 3 red 56 0.030 - 0.052
    Assignment of crankshaft bearing shell bottom halves (bearing cap) M 112, 113
    Diameter Main bearing journal Laser inscription AM crankshaft journal Front Color coding for bearing shell Order index Main bearing play (mm)
    63.940-63.945 V purple 58 0.030 - 0.052
    63.945-63.950 W white 57 0.030 - 0.052
    63.950-63.955 R red 56 0.030 - 0.052
    63.955-63.960 G yellow 54 0.030 - 0.052
    63.960-63.965 b blue 52 0.030 - 0.052

    IMPORTANT The bottom halves of the bearing shells (7) are assigned to the basic journal of the crankshaft by means of the first letter of the respective color.

    IMPORTANT The color coding of the lower bearing shell halves (7) is located on the rear of the lower bearing shell halves (7).

    IMPORTANT The initial letters of the particular colors are engraved on the journal of the crankshaft.

    IMPORTANT When installing the bearing shell halves, it is important to keep to the order of the colors which is engraved on the journal of the crankshaft!

    Fig 2: Identifying Initial Letters Of The Particular Colors Engraved On The Journal Of The Crankshaft
    G04605690Courtesy of MERCEDES-BENZ OF NORTH AMERICA.

    Example: Engine 112 

    IMPORTANT Arrow identifies direction of travel.

    • First letter `r': A bearing shell with the color coding red must be inserted in bearing cap `1'.
    • Second letter `b': A bearing shell with the color coding blue must be inserted in the bearing cap `2'.
    • Third letter V: A bearing shell with the color coding purple must be inserted in the bearing cap `3'.
    • Fourth letter `w': A bearing shell with the color coding white must be inserted in the bearing cap `4'.
    Fig 3: Identifying Bearing Caps
    G04605691Courtesy of MERCEDES-BENZ OF NORTH AMERICA.
  3. Insert the bearing shell top halves (1) with oil drillings (2) and oil grooves (3) into the crankcase.

    IMPORTANT When doing this, ensure that the anti-twist locks (4) of the bearing shell halves (1) are located in the recesses of the crankcase.

  4. Insert the bearing shell bottom halves (7) into the bearing caps (6).

    IMPORTANT When doing this, ensure that the anti-twist locks (5) of the bottom bearing shell halves (7) are located in the recesses of the bearing caps (6).

    Fig 4: Inserting Bearing Shell Top Halves With Oil Drillings And Oil Grooves Into Crankcase
    G04605692Courtesy of MERCEDES-BENZ OF NORTH AMERICA.
  5. The thrust plates (8) are assigned to the bearing caps (6) using the numbers "1" and "0" (see table). These are engraved on the journal of the crankshaft (arrowed).

    IMPORTANT The thrust plates (8) installed must have the same designation.

    Fig 5: Identifying Thrust Plates Assigned To Bearing Caps
    G04605693Courtesy of MERCEDES-BENZ OF NORTH AMERICA.
    Assignment of thrust washers to crankshaft M 112,113
    Crankcase Basic journal of the fitted bearing of the crankshaft Thrust washers Axial play Crankshaft (mm )
      Inscription Designation Marking
    No subdivision N 0 N Abbreviated reference number 0.10-0.266
    No subdivision N1 1 N1 Abbreviated reference number 0.10-0.266
  6. Insert crankshaft (15) into crankcase
  7. Install top thrust washers (8).

    IMPORTANT The oil grooves (9) of the thrust plates (8) must point toward the crank webs (10).

    Fig 6: Identifying Crankshaft , Crankcase, Thrust Washers & Crank Webs
    G04605694Courtesy of MERCEDES-BENZ OF NORTH AMERICA.
  8. Install bearing caps (6) according to their markings.

    IMPORTANTInstallation:  When installing the fit bearing cap (13), hold both thrust plates (8) tight. The anti-twist locks (11) of the thrust plates (8) must be located in the slots (12) of the fit bearing cap (13). The oil grooves (9) of the thrust plates (8) must point toward the crank webs (10).

    Fig 7: Installing Bearing Caps
    G04605695Courtesy of MERCEDES-BENZ OF NORTH AMERICA.
  9. Moisten the thread and head contact surface of the bolts of the bearing caps with oil.
  10. Tighten the bolts of the bearing caps as specified in the tightening pattern TORQUE SPECIFICATION .

    IMPORTANT Note tightening torque and tightening angle of bearing cap bolts. If no torquing angle wrench is available, the bearing cap bolts can be torqued further by the specified angle in a single operation using a wrench and locking handle. Do not use a flexi-rod torque wrench for tightening in order to avoid any angle errors.

  11. Turn crankshaft to check for unobstructed movement.
    Fig 8: Locating Bolts Of Bearing Caps
    G04605696Courtesy of MERCEDES-BENZ OF NORTH AMERICA.
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