11 21 531 Replacing all crankshaft main bearing shells (S62)

WARNING: This page is about a different car, the 2003 BMW Z8, 2002 BMW Z8, 2001 BMW Z8, and 2000 BMW Z8. However, it is still accessible from the selected car via links, so may be relevant.

(engine dismantled)

Clean components before installation.

Preliminary tasks are described in the Section Replacing crankshaft, refer to 11 21 500 REPLACING CRANKSHAFT (S62) .

CAUTION: Note grinding stage of crankshaft, refer to 11 21 CRANKSHAFT AND BEARINGS S62 and 11 21 CRANKSHAFT AND BEARINGS S62 .

NOTE: Install main bearing shells (1) in the motor block with lubrication groove.
Install main bearing shells (2) without lubrication groove in the main bearing caps.

Fig 1: Identifying Main Bearing Shells

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NOTE: When crankshaft or main bearing shells are being replaced, the classification for the arrangement of the main bearing shells in the crankcase is no longer of significance. Install yellow main bearing shells in crankcase.

Fig 2: Installing Yellow Main Bearing Shells

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NOTE: The crankshaft is marked with yellow, green or white paint according to the tolerance of the main journal.

Coat bearing shells with oil.

Install crankshaft.

Fig 3: Installing Crankshaft

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NOTE: Place main bearing shells with same color code as that of crankshaft in main bearing caps.

Fig 4: Installing Main Bearing Shells

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Release hex head in main bearing cap.

Fig 5: Releasing Hex Head

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NOTE: Install stop disk for collar bearing (3) (in engine block).
Install stop disk for collar bearing (4) (in main bearing cap).

Fig 6: Installing Stop Disks

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CAUTION: Check installation direction. Lubricant groove must be facing crankshaft.

Fig 7: Checking Installation Direction

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Insert stop disks for collar bearing on both sides between crankshaft and engine block at main bearing 5.

Align thrust washers with contact face of main bearing caps.

Fig 8: Aligning Thrust Washers

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NOTE: Main bearing caps 1 and 2 are marked with punched numbers.
Main bearing cap 3 is marked with three notches.
Main bearing caps 4 and 5 are not marked.

Fig 9: Identifying Main Bearing Caps

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NOTE: Main bearing cap no. 5 can be identified by the recesses for the stop disks of the thrust bearing.

Fig 10: Identifying Main Bearing Cap No. 5

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Insert stop disks on both sides into grooves of main bearing cap no. 5.

Fig 11: Inserting Stop Disks

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Checking main bearing clearance:

Do not twist crankshaft.

Fit special tool 00 2 590 (Plastigage Type PG 1) to the oil-free crankshaft.

Fig 12: Checking Main Bearing Clearance

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Position main bearing caps (1 to 5) so that retaining grooves of main bearing shells are on one side.

Fig 13: Positioning Main Bearing Caps

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Align main bearing cap flush with side of bearing seat.

To check crankshaft bearing clearance, use old main bearing screws.

No oil is permitted in the blind bores (danger of cracking).

Tighten all screws on main bearing cover with jointing torque.
Tighten down all bolts on main bearing cap with special tool 00 9 120 with torsion angle.

Fig 14: Tightening Bolts With Special Tool
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Tightening Torque 11 11 2AZ, refer to 11 11 ENGINE BLOCK .

Remove main bearing cover and read off main bearing clearance from thickness of crushed plastic thread with the help of the measuring scale.

Fig 15: Measuring Main Bearing Clearance

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Main bearing clearance, refer to 11 21 CRANKSHAFT AND BEARINGS S62 and 11 21 CRANKSHAFT AND BEARINGS S62 .

Remove plastic thread.

Lubricate crankshaft and main bearing shells.

Position main bearing caps (1 to 5) so that retaining grooves of main bearing shells are on one side.

Fig 16: Positioning Main Bearing Caps

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Align main bearing cap flush with side of bearing seat.

NOTE: Always replace bolts in main bearing caps with new ones.
Do not wash off bolt coating.
No oil is permitted in the blind bores)! (Danger of cracking).

Tightening specifications for main bearing:

Tighten all screws on main bearing cover with jointing torque.
Unfasten screws on main bearing cover 5
Strike back and front of crankshaft with plastic hammer to center thrust bearing (do not damage crankshaft).
Tighten screws of main bearing cover 5 with jointing torque.
Tighten down all bolts on main bearing cap with special tool 00 9 120 with torsion angle.

Fig 17: Tightening Bolts
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Tightening Torque, refer to 11 11 ENGINE BLOCK .

Checking axial play:

Fig 18: Checking Axial Play

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Axial play, refer to 11 21 CRANKSHAFT AND BEARINGS S62 .

If necessary, check the guide bearing shell, crankshaft and engine block.

Tighten threaded protective bushes.

Fig 19: Tightening Threaded Protective Bushes

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Tightening Torque 11 11 3AZ, refer to 11 11 ENGINE BLOCK .

Replace collar screws.

Fig 20: Replacing Collar Screws

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Tighten down taper screw mount on main bearing.

Tightening Torque 11 11 3AZ, refer to 11 11 ENGINE BLOCK .