Measuring Big End Bearing Play; Installing Big End Bearing - BMW K 1100 LT Repair Manual

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.
11 2 210
1
Tighten the big end bearings with wrench angle
•
indicator (1), BMW No. 11 2 210.
X
Tightening torque:
Wrench angle .................................................. 80°
11.40
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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.
LT110620
X
Tightening torque:
Wrench angle .................................................... 80°
LT110630