Mitsubishi S6R Series Service Manual page 138

2.11 Piston - Install
When installing the piston, install the eye bolt to the
threaded hole on the piston top, and lift the piston with
chain block. When the installation work is done by
hand, be sure to take preventive measures so that pis-
ton does not falling down, and be very careful not to
hurt your hands and fingers or not to damage the
parts.
(a) Make sure that the punch mark on the piston top
faces the camshaft side.
(b) Checking through the inspection window on the
side of crankcase, make sure that the connecting
rod does not hit the piston cooling nozzle when
installing piston.
(c) To prevent the oil ring from impact damaging,
slowly insert the piston.
(1) Insert the connecting rod into the cylinder liner care-
fully not to damage the liner, and slowly lower the pis-
ton to the upper surface of crankcase.
(2) Apply engine oil to the piston rings.
Place the end gaps equally spaced each other, avoiding
piston pin and thrust/anti-thrust directions.
(3) Hold the compression ring position of piston with
hands, and slowly insert the piston skirt into cylinder
liner.
(4) Verify again the positions of piston ring gaps.
Apply engine oil to the piston rings.
Apply engine oil to the inner surface of piston installer.
Verify the oil ring placed in the groove. Then, compress
the piston rings with piston installer.
Note: For piston ring placing, see above (2).
Chapter 7 ASSEMBLY OF BASIC ENGINE
Piston
Be careful not to bump.
Piston and Connecting Rod - Install
Coil spring joint
Piston pin
No. 2 compression ring joint
Piston Ring End Gaps - Place
Compression ring
Piston Skirt - Insert
Piston installer
P/N:37191-07100
Piston Ring - Compress
Camshaft side
Piston top
punch mark "CAM↓"
No. 1 compression ring joint
Oil ring joint
7-13