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DRAWING OF PISTON AND DISMOUNTING OF CRANK BEARING
The pistons should not be drawn until oil consump-
tion is too great. Then the oil control rings and
probably also the compression rings have to be re-
placed.
Dismounting of piston and bearing:
The cylinder cover is dismounted. The uppermost 5 cm
of the cylinder lining are cleaned from soot.
The lifting tool is fastened to the piston - see drawing (on
recent engines type 427, use an M 12 eye bolt).
The crank covers are dismounted.
The forelocks in the connecting rod studs are removed
and the slotted nuts are loosened. The nut in starboard
side is unscrewed.
The crank is turned to top for the piston in question.
The last slotted nut is unscrewed and the base of the
bearing is lowered into the oil pan. The pase of the
bearing is removed (prodcedure - see 7-14).
The piston is lifted and the upper part of the bearing is
turned 180°, then lowered and removed. The filler for
piston height is removed together with the upper part.
Mounting of piston and bearing:
The piston guide is placed at the top of the cylinder lining
(see drawing).
The piston is lowered and the rings are turned into the
places at the same time. The ring gaps must be
staggered.
The piston is lubricated a little with oil.
The top of the bearing and the filler for the piston height
are lifted into their places.
The base of the bearing is mounted. The slotted nuts are
fastened and secured (torque for 422/425: approx 64
kpm and for 427: approx. 76 kpm).
The crank housing covers are mounted.
7-230-2B
Callesen Diesel
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