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

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INSPECTION DATA FOR CRANKSHAFT BEARING CLEARANCE

Number	Designation			Engine 272
BE03.20-P-1001-04E	Main bearing play	radial when new	mm	0.022...0.046
BE03.20-P-1001-04E	Main bearing play	axial when new	mm	0.100...0.266

Assignment of crankshaft bearing shell upper half (crankcase)
Diameter crankshaft bearing in crankcase	Number or center punch marks on crankcase	Color coding for bearing shell	Bearing clearance (mm)
68.500-68.506	1	blue	0.022-0.046
over 68.506-68.513	2	Yellow	0, 022-0, 046
over 68.513-68.519	3	Red	0.022-0.046

Assignment of crankshaft bearing shell lower half (bearing cap)
Diameter crankshaft bearing journal	Laser inscription on front crankshaft journal	Color coding for bearing shell	Bearing clearance (mm)
63.945-63.949	v	purple	0.022-0.046
over 63.949-63.953	w	white	0, 022-0.046
over 63.953-63.957	r	red	0.022-0.046
over 63.957-63.961	g	yellow	0.022-0.046
over 63.961-63.965	b	blue	0.022-0.046

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 debris 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: Locating Bearing Shell Numbers Stamped On Crankcase
Courtesy of MERCEDES-BENZ OF NORTH AMERICA.
- 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: Identifying Initial Letters Of Particular Colors Engraved On Journal Of Crankshaft
Courtesy of MERCEDES-BENZ OF NORTH AMERICA.

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: Identifying Bearing Caps And Direction Of Travel
  Courtesy of MERCEDES-BENZ OF NORTH AMERICA.
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.
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: Identifying Crankshaft Bearing Components
Courtesy of MERCEDES-BENZ OF NORTH AMERICA.
Insert crankshaft (7) in the crankcase.
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: Identifying Crankshaft, Thrust Washers And Crankshaft Webs
Courtesy of MERCEDES-BENZ OF NORTH AMERICA.
Install crankshaft bearing caps (2) according to their identification.
Installation: 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: Identifying Crankshaft Bearing Components
Courtesy of MERCEDES-BENZ OF NORTH AMERICA.