Subaru Legacy 2004 Service Manual page 301

19) Install the piston pin.
(1) Apply a coat of engine oil to ST3.
(2) Insert ST3 into the service hole to align pis-
ton pin hole with connecting rod small end.
ST3 499017100 PISTON PIN GUIDE
ST1
(3) Apply a coat of engine oil to piston pin, and
insert the piston pin into piston and connecting
rod through service hole.
(4) Install the snap ring.
NOTE:
Use new snap rings.
(5) Apply liquid gasket around the service hole
plug.
Liquid gasket:
THREE BOND 1215 (Part No. 004403007) or
equivalent
Cylinder Block
ST3
ME-00158
ME-00159
ME-00160
ME(H4SO 2.0)-71
(6) Install the service hole plug and gasket.
NOTE:
Use a new gasket.
MECHANICAL
ME-00140