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

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CHECK VALUES FOR CRANKSHAFT BEARING CLEARANCE

Number	Designation			Engine 112 except 112.951/976, Engines 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
BE03.20-P-1001-04E	Main bearing play	radial when new	mm	0.026 to 0.050	0.026 to 0.050
BE03.20-P-1001-04E	Main bearing play	axial when new	mm	0.10 to 0.266	0.10 to 0.266

CRANKSHAFT BEARING CAP

Number	Designation				Engines 112, 113
BA03.20-P-1001-01D	Crankshaft bearing cap bolt	M8	Stage 1	Nm	20
BA03.20-P-1001-01D	Crankshaft bearing cap bolt	M8	Stage 2	∠°	90
BA03.20-P-1002-01D	Side crankshaft bearing cap bolt	M8		Nm	30
BA03.20-P-1003-01D	Crankshaft bearing cap bolt	M10	Stage 1	Nm	5
			Stage 2	Nm	30
			Stage 3	°∠	90

Blow through oil galleries in direction of flow oil with compressed air.

Clean the bearing points in the crankcase, main bearing cap and main bearing journal of crankshaft with a chamois leather.

If a bearing damage has occurred, it may be necessary to remove any debris 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.

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

Fig 1: Locating Upper Bearing Shell On Crankcase

Courtesy of MERCEDES-BENZ OF NORTH AMERICA.

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

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

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

The color coding of the bottom halves of the bearing shells is located at the rear of the lower bearing shell halves.

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

When installing the bearing shell halves, the order of the colors engraved on the journal of the crankshaft must be maintained.

Fig 2: Locating Bearing Shell Halves

Courtesy of MERCEDES-BENZ OF NORTH AMERICA.

Arrow identifies direction of travel.

First letter "r": A bearing cap with the color coding red must be inserted in bearing cap "1".
Second letter "b": A bearing cap with the color coding blue must be inserted in bearing cap "2".
Third letter "v": A bearing cap with the color coding violet must be inserted in bearing cap "3".
Fourth letter "w": A bearing cap with the color coding white must be inserted in bearing cap "4".

Fig 3: Identifying Bearing Cap Direction Of Travel
Courtesy of MERCEDES-BENZ OF NORTH AMERICA.

Insert the bearing shell top halves (1) with oil drillings (2) and oil grooves (3) into the crankcase.
When doing this, ensure that the anti-twist locks (4) of the bearing shell halves (1) are located in the recesses of the crankcase.
Insert the bearing shell bottom halves (7) into the bearing caps (6).
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
Courtesy of MERCEDES-BENZ OF NORTH AMERICA.

The thrust plates 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).

The thrust washers installed must have the same designation.

Fig 5: Locating Thrust Washers

Courtesy 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)
Crankcase		Inscription	Designation	Marking	Axial play Crankshaft (mm)
No subdivision	N	0	N	Abbreviated reference number	0, 10-0, 266
No subdivision	N1	1	N1	Abbreviated reference number	0.10-0.266

Insert crankshaft (15) into crankcase
Install top thrust washers (8).
The oil grooves (9) of the thrust plates (8) must point toward the crank webs (10).

Fig 6: Installing Thrust Washers
Courtesy of MERCEDES-BENZ OF NORTH AMERICA.
Install bearing caps (6) according to their markings.
Installation: 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 According To Their Markings
Courtesy of MERCEDES-BENZ OF NORTH AMERICA.
Moisten the thread and head contact surface of the bolts of the bearing caps with oil.
Tighten the bolts of the bearing caps as specified in the tightening pattern.
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.
Turn crankshaft to check for unobstructed movement.

Fig 8: Identifying Bearing Cap Bolts Tightening Sequence
Courtesy of MERCEDES-BENZ OF NORTH AMERICA.