Assign crankshaft bearing shells - AR03.20-P-4360-01VA

ENGINE 272 

1. Clean crankshaft bearing points in crankcase, crankshaft bearing caps and crankshaft journal for crankshaft using a chamois leather.

   After bearing damage has occurred, it may be necessary to remove swarf from the conrod bores and from the crankshaft and crankcase oil galleries as well as from the crankcase!

   • Do not use a hard object for cleaning.
   • Blow through oil galleries in direction of flow oil with compressed air.

   The top main bearing halves are assigned to the crankshaft journal by means of a colored coding (on the rear of the main bearing shells) and numbers or chisel punches, which are stamped on the crankcase (see arrows).

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

   Fig 1: Crankcase Colored Coding And Numbers

   Courtesy of MERCEDES-BENZ USA

   

   • The bottom crankshaft bearing shells are assigned to the crankshaft journal of the crankshaft by means of letters (initial letter of the particular color).
   • The colored coding of the lower crankshaft journal is located at its rear.
   • The initial letters of the particular colors are engraved on the crankshaft journal.

   When installing the crankshaft bearing shells it is important to keep to the order of the colors which is engraved on the crankshaft journal! 

   Fig 2: Lower Crankshaft Journal Colored Coding

   Courtesy of MERCEDES-BENZ USA

   Arrow identifies direction of travel.

   • First letter r:  A crankshaft bearing shell must be inserted in the crankshaft bearing cap (1) with the colored coding red  .
   • Second letter b:  A crankshaft bearing shell must be inserted in the crankshaft bearing cap (2) with the colored coding blue  .
   • Third letter v:  A crankshaft bearing shell must be inserted in the crankshaft bearing cap (3) with the colored coding violet  .
   • Fourth letter w:  A crankshaft bearing shell must be inserted in the crankshaft bearing cap (4) with the colored coding white  .
     Fig 3: Crankshaft Journal Color Coding Order

     Courtesy of MERCEDES-BENZ USA
2. Insert top crankshaft bearing shell halves (1) with the oil drill holes (2) and the oil grooves (3) into the crankcase.

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

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

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

   Fig 4: Inserting Bottom Bearing Shell Halves Into Bearing Caps

   Courtesy of MERCEDES-BENZ USA
4. Insert crankshaft (7) in the crankcase.
5. Install top thrust washers (8).

   There is only one fitted bearing width and therefore only one washer disc width is used. The oil grooves of the thrust washers (8) must point toward the crankshaft webs (10).

   Fig 5: Installing Top Thrust Washers

   Courtesy of MERCEDES-BENZ USA
6. Install crankshaft bearing caps (2) according to their identification.

   The anti-twist locks (11) of the lower thrust washers (8) must be located in the slots (12) of the fit bearing cap (3).

   The oil grooves (9) of the lower thrust washers (8) must point toward the crankshaft webs (10).

   When installing the crankshaft fit bearing cap (3), hold both repair thrust washers (8) tight.

   Fig 6: Installing Lower Thrust Washers Anti-Twist Locks In Fit Bearing Cap Slots

   Courtesy of MERCEDES-BENZ USA