Checking Piston Dimensions; Measuring Piston Pin; Removing Crankshaft - BMW C1 Repair Manual

Checking piston dimensions

– Remove cylinder.
•
Measure piston diameter 8 mm (0.31 in) above
bottom edge of piston skirt.
•
Measure diameter of piston pin in piston stroke
direction.
Piston dimensions:
"A" diameter of piston.............. 56.37 mm (2.219 in)
"B" diameter of piston ............. 56.38 mm (2.220 in)
Wear values:
Installed clearance .................... 0.06 mm (0.002 in)
Piston pin bore dia. .........max. 15.03 mm (0.592 in)

Measuring piston pin

•
Measure diameter of pin at both ends and in the
middle.
Wear values:
Installed clearance .................... 0.04 mm (0.001 in)
Diameter of piston pin ............. 14.99 mm (0.590 in)

Removing crankshaft

– Remove starter motor.
– Remove cylinder.
– Remove cylinder base gasket.
– Secure engine in assembly stand.
– Variator side up.
C1111060
•
Remove securing screws.
•
Carefully separate halves of housing.
e
Caution:
Take care not to damage bearing shells on splines.
•
Remove crankshaft.
L
Note:
Thrust washer might be stuck to inside of housing.
C1111070
C1111080
11.63