3 Series E92 328i (N51) COUPE
Measure piston installation clearance:
Measure piston diameter with micrometer at measuring point A
from bottom edge of piston and offset at 90
°
to the axis of the
piston pin.
Piston diameter at measuring point A.
Adjust micrometer to cylinder bore of engine block. Set internal
caliper on micrometer to zero. Measure bottom, center and top of
cylinder bore in direction of travel and direction of engine rotation.
Diameter of cylinder bore.
Piston installation clearance.
Total permissible wear tolerance.
If necessary, replace piston.
Warning!
Protective goggles must be worn.
Insert piston circlip (2) into groove (1) of special tool 11 4 493 .
Bring piston circlip into assembly position.
Warning!
Protective goggles must be worn.
Guide lug and cutout on special tool 11 4 493 must point to the
piston crown; only then can special tool 11 4 494 be correctly
fitted.
When special tools 11 4 493 and 11 4 494 are correctly
positioned, the piston pin circlip must be driven in with a plastic
hammer in the direction of the arrow.
Note:
See illustration.
RA Removing and installing/replacing all pistons (N51)
BMW AG - TIS
23.02.2013 10:47
Issue status (12/2007) Valid only until next DVD is issued
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