Avtodizel ???-238??, Operating Instructions Manual, Page: 32 / 254

32
Ring part number is 236-1004032-
А
3
−
the oil ring of box section with chrome-plated working
edges and twisted spring expander.
Ring part number is 236-1004034
3 The four-ring complete set 236-1004002-
А
4, where:
−
the first compression ring in section is a unilateral tra-
peze. A working surface chrome-plated with porous
chrome.
Ring part number is 236-1004030-
А
2
−
The second and third compression rings have in section a
unilateral trapeze, minute.
Ring part number is 236-1004032-
А
3
−
the oil ring of box section with chrome-plated working
edges and twisted spring expander.
Ring part number is 236-1004034
At installation of piston rings to pay special attention to correct-
ness of their arrangement. The word "Top" should be inverted to the
piston head.
For maintenance of exact fitting at assembly the piston and liner
should be selected from one-dimensional group.
Liner Mark Piston Mark
А АНБ
Б БНБ
Ж ЖНБ
PISTON PIN
The piston pin of
ЯМЗ
-238
БЕ
and
ЯМЗ
-238
ДЕ
engines is hol-
low, of floating type with the cemented outside surface. The pin is in-
stalled in the piston boring; the axial moving of the pin is limited with
circlips installed in special grooves in piston bosses.
The piston pin of
ЯМЗ
-238
БЕ
2 and
ЯМЗ
-238
ДЕ
2 engines is
nitrided, also has increased outside diameter (fig 13).