Checking main bearing clearance
To check crankshaft bearing clearance, use the existing main bearing screws.
No oil is permitted in the blind bores.
Do not twist crankshaft.
Place special tool 00 2 590 (Plastigage model PG 1) on oil-free crankshaft (see arrow).
Tighten down all collar bolts (M11) of main bearing caps in sequence 1 to 5 to jointing torque.
Tightening torque 11 11 1AZ, see 11 11 ENGINE BLOCK
Tighten down all collar bolts (M11) of main bearing caps with special tool 00 9 120 to angle of rotation.
Remove main bearing cap.
Read off main bearing play at width of flattened plastic thread with assistance of measurement scale.
Main bearing play .
- Remove plastic thread
- Apply a coat of oil to new bearing shells and crankshaft
Do not wash off bolt coating.
No oil is permitted in the blind bores.
Install crankshaft .
Carefully strike back and front of crankshaft with a plastic hammer to center thrust bearing (do not damage crankshaft).
Secure special tool 11 6 252 with magnetic foot on crankcase.
Position special tool 11 6 251.
Tightening specifications for main bearing:
Check side clearance (axial play ).
Check guide bearing shell, crankshaft and crankcase if necessary.
Assemble engine.