Subaru IMPREZA GD 2007 Series Manual page 2479

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MECHANICAL
20) Install piston.
(1) Set the parts so that the #1 and #2 cylinders
are on the upper side.
(2) Using the ST1, turn the crankshaft so that
#1 and #2 connecting rods are set at bottom
dead center.
ST1 499987500 CRANKSHAFT SOCKET
(3) Apply a coat of engine oil to the pistons and
cylinders and insert pistons in their cylinders us-
ing ST2.
ST2 498747300 PISTON GUIDE
ST2
NOTE:
Face the piston front mark towards the front of the
engine.
(A)
(A) Front mark
21) Install piston pin.
(1) Apply a coat of engine oil to ST3.
(2) Insert ST3 into the service hole to align the
piston pin hole and the connecting rod small
end.
ST3 499017100 PISTON PIN GUIDE
ST1
Cylinder Block
ST1
ME-00157
ME-00786
ST3
ME-00158
ME(H4DOTC)-78
(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 to the threaded portion
of the service hole plug.
Liquid gasket:
THREE BOND 1105 (Part No. 004403010) or
equivalent
ME-00159
ME-00160