wsm STW37 Workshop Manual page 137

STW34, STW37, STW40, WSM
Piston Ring and Connecting Rod
1. Remove the piston rings (4), (5), (6) using a piston ring tool
(Code No. 07909-32121).
2. Remove the piston pin (1), and separate the connecting rod (7)
from the piston (2).
(When reassembling)
• When installing the rings, assemble the rings so that the
manufacturer's mark (12) near the gap faces the top of the
piston (2).
• When installing the oil ring (6) onto the piston (2), place the
expander joint (10) on the opposite side of the oil ring gap (11).
• Apply engine oil to the piston pin.
• When installing the piston pin (1), immerse the piston (2) in
80 °C (176 °F) oil for 10 to 15 minutes and insert the piston pin
(1) to the piston (2).
• When installing the connecting rod (7) to the piston (2), align the
mark (8) on the connecting rod (7) to the fan-shaped concave
(9).
NOTE
• Mark the same number on the connecting rod (7) and the
piston (2) so as not to change the combination.
(1) Piston Pin
(2) Piston
(3) Piston Pin Snap Ring
(4) Top Ring
(5) Second Ring
(6) Oil Ring
1-S58
ENGINE
(7) Connecting Rod
(8) Mark
(9) Fan-Shaped Concave
(10) Expander Joint
(11) Oil Ring Gap
(12) Manufacturer's Mark
9Y1211109ENS0084US0
KiSC issued 11, 2014 A