Man D2862 LE221, Repair Manual

Page: 329 / 420

CRANK MECHANISM
Detaching the pistons
Removing the piston pin
• Mark the relative positions of the piston (2), piston
pin (4) and connecting rod (5)
• Detach the internal circlips (1) and (3)
• Press the piston pin (4) out of the piston (2)
• Remove the piston (2)
Measuring the pistons, piston rings and
connecting rods
Measuring the piston pins
• Measure the piston pin (1) using a micrometer (2)
If the dimension of the piston pin (1) is out of
tolerance (
54.994 – 55.000 mm ), t a new piston
with piston pin (1).
Measuring the piston ring axial play
Note
The axial play cannot be measured on the
keystone ring
• Measure the axial play between the
double-bevelled ring (3) and the piston (4)
at several points using the
Feeler gauge [139] (1)
• Measure the axial play between the taper-face ring
(2) and the piston (4) at several points using the
Feeler gauge [139] (1)
The axial play on the double-bevelled ring (3) must
be
0.040 – 0.085 mm .
The axial play on the taper-face ring (2) must be 0.09
– 0.18 mm .
If the axial play is out of tolerance, t a new piston
and piston rings.
AE6 3st edition 327