Maintenance manual for sunray hfc4da1-2c china-IV diesel engines
33
p. Install the oil ring bush ring.
q. Use a piston ring expander to install the 2
nd
compression ring and the 1
st
compression ring. While
installing the compression rings, face upward the
marking N (The lip of 2
nd
compression ring shall face
downward).
The overlap position of oil control ring cushion spring
and the opening of oil control ring steel strip shall be
180º away from each other and shall be 90º away from
the 2nd compression ring.
r. Measure the outside diameter of main journal and the
inside diameter of main shaft bore.
Illustration of opening directions for
piston rings
Forward marking
Compression
ring
Overlap of oil
control ring
cushion spring
Opening of oil control
ring steel strip
Main thrust face
Auxiliary
thrust face
Compressi
on rin
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