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

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CHECK VALUES FOR CRANKSHAFT BEARING CLEARANCE

Number	Designation			Engine 113.987/988/989/ 990/991/993	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
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.
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.

Fig 1: Inserting Bearing Shell Top Halves With Oil Drillings And Oil Grooves Into Crankcase
Courtesy of MERCEDES-BENZ OF NORTH AMERICA.
Insert the bearing shell bottom halves (7) into the bearing caps (6).
Mount bearing cap (6), tighten without rotation angle for measuring procedure .
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).
Measure and note the bearing diameter (actual dimension) at all four crankshaft bearings.
Subtract the radial bearing clearance of the individually measured bearing diameters from this.
Grind all four crankshaft bearing points to the calculated bearing diameter.
Note the assignment of the determined bearing diameters to the crankshaft bearing points.
Remove bearing cap (6) again.
Insert crankshaft into crankcase.
Measure the axial play of the crankshaft and examine the crankshaft contact point for wear.

Fig 2: Installing Thrust Washers
Courtesy of MERCEDES-BENZ OF NORTH AMERICA.

Maintain the axial play of the crankshaft when the crankshaft is ground to repair size. If it is necessary to grind the crankshaft at the contact point of the axial bearing (bearing point 3), to order thrust washer parts kit repair size 1 and to measure the axial play of the crankshaft without thrust washer.

Add the axial bearing play to the thickness measured for the repair size thrust plate and subtract the measured axial play without the repair thrust plate to obtain the dimension by which the crankshafts must be ground at the contact point of the axial bearing (bearing point 3).

Fig 3: Measuring Axial Play Of Crankshaft Without Thrust Washer
Courtesy of MERCEDES-BENZ OF NORTH AMERICA.
Remove crankshaft.
Grind the crankshaft at the contact point to the calculated dimension.
Insert crankshaft ground to repair dimension into crankcase.
Install the top repair thrust washers (8).
The oil grooves on the repair thrust washers (8) must point towards crank webs (10).
Install bearing caps (6) according to their markings.
When installing the fit bearing cap, hold both repair thrust plates (8) tight. The anti-twist locks (11) of the repair thrust plates (8) must be located in the slots (12) of the fit bearing cap.

The oil grooves (9) of the thrust plates (8) must point toward the crank webs (10).
Moisten the thread and head contact surface of the bearing caps (6) bolts with oil.
Tighten bolts for the bearing caps (6) as specified in the tightening pattern .
Note specified torque and tightening angle of the bolts. If no torquing angle wrench is available, the 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 4: Identifying Bearing Caps Bolts Tightening Sequence
Courtesy of MERCEDES-BENZ OF NORTH AMERICA.