11.40
Measuring big end bearing play
•
Turn the crankpin 30° away from bottom dead
centre.
•
Wipe oil off crankpin and bearing cap.
•
Place Plastigage strip (arrow), Type PG-1,
BMW No. 00 2 590, over the entire width of the
bearing, 6…8 mm (0.24…0.32 in) away from the
centre of the crankpin.
•
Attach the bearing caps with the joint lines
aligned, and tighten them.
X
Tightening torque:
Big end bearings .......................................... 30 Nm
L
Note:
The crankshaft must not be turned any more at this
stage.
•
Tighten the big end bearings with wrench angle
indicator (1), BMW No. 11 2 210.
X
Tightening torque:
Wrench angle .................................................. 80°
•
Unscrew and remove the bearing cap.
•
Determine bearing play against comparison
scale (arrow).
Bearing
play ............. 0.030…0.066 mm (0.0012…0.0026 in)
Wear limit .............................. 0.130 mm (0.0051 in)
•
If bearing shells are renewed, note paint marks
on crankpin and on big end bearing.
•
Regrinding stages “0” and “1” are available; the
crankpins are marked with a corresponding
number of paint spots.
•
If there are no paint spots, this indicates regrind-
ing stage “0”.
L
Note:
The crankshaft can only be reground in stage “0”,
and must be hardened and finished afterwards.
Installing big end bearing
•
Move the crankpin of the cylinder concerned to
bottom dead centre.
•
Oil the crankpin and attach the conrod.
•
Pull the protective tubes off the bolts.
•
Attach the bearing caps with the joint lines
aligned, and tighten them.
X
Tightening torque:
Big end bearings .......................................... 30 Nm
•
Using wrench angle indicator,
BMW No. 11 2 500, tighten the big end bearing.
X
Tightening torque:
Wrench angle .................................................... 80°
LT110610
LT110620
11 2 210
1
LT110630
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