MAINTENANCE MANUAL OF GW4D20/GW4D20B TURBOCHARGED DIESEL ENGINES
328
Great Wall Baoding Internal Combustion Engine
Manufacturing Company Limited
Fig. 5-16-14 Installing the piston
Fig. 5-16-15 Installing the piston ring and clip
Fig. 5-16-16 Installation sequence for piston
ring
(2) Install the piston pin into the piston pin hole (see Fig.
5-16-15). The piston should rotate smoothly in the
piston pin hole and without any seizure after installation.
Installing the clip
⑨
Install the clip (see Fig. 5-16-15) into the piston clip
groove completely and ensure the clip can perform
circumferential slip. It is not allowed that part of the clip
is outside the ring groove or it is not fall into the groove
completely.
Caution:
the piston pin clip must be firmly fixed.
Installing the piston ring
⑧
(1) Use the piston ring expander to install the oil ring
component, the second compression ring and the first
compression ring into the corresponding piston ring
grooves in order.
(2) The piston ring should be installed to the piston ring
groove in a correct direction with the top marks (TOP) of
the first and second compression rings upward (see
Fig. 5-16-6 and Fig. 5-16-17).The piston ring should
move smoothly in the ring groove and without any
stagnation, and the clearance meets the requirement
after installation.
Attention:
——Two compression rings are not interchangeable.
——The piston ring should not tilt.
——No defect or foreign materials in the piston ring
groove
Clearance of piston ring
Piston ring
Clearance
between the
piston ring and
the piston ring
groove
Clearance of
piston ring
open end
First
compression
ring
0.055~0.100mm
0.20~0.40mm
Second
compression
ring
0.035~0.080mm
0.65~0.85mm
Oil ring
component
0.030~0.070mm
0.25~0.50mm
Piston
Connecting rod
body
Connecting rod
cover
Side marked (TOP)
upwards
First compression ring
Second
compression
ring
Taper face
Oil ring
