Piston, cylinder lining, connecting
rod
P0006010
The engine has solid, forged steel, oil-cooled pistons.
Each piston (
A
) has two compression rings and one
oil scraper ring. The upper compression ring (
1
) has
a trapezoid “Keystone” section. The lower compres-
sion ring (
2
) has a rectangular section. The oil scraper
ring (
3
) at the bottom is spring loaded.
All piston rings are installed with the marking facing
up; thus
marking up
also applies when installing the
oil scraper ring.
The cylinder liner (
B
) is replaceable. They are cast
centrifugally in iron alloy. The inside of the liner has a
crosshatch machining pattern, honing (
4
). The final
cylinder liner fine surface machining is performed
using a method called plateau honing (
5
), where the
sharpest apexes from the basic machining are ground
away.
The connecting rod is (
C
) forged and split at the lower
end (big end) using a method known as fracture split-
ting. The upper end (small end) has a pressed-in bush
(
6
) for the piston pin lubricated via a drilled channel
(
7
). The two parts of the big end are fastened together
by four bolts, and each connecting rod has a marking
from 007 to 999 on the two parts (
8
). The connecting
rod is marked ”FRONT” in order for it to be installed
correctly.
20-0 Engine Information, General
70
7748841 06-2010
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