Subaru IMPREZA GD 2007 Series Manual page 2468

asieps_tobira_IM_US.book 67 ページ ２０１２年１月１７日 火曜日 午後３時４８分
1) Install the valve spring and valve.
(1) Coat the stem of each valve with engine oil
and insert the valve into the valve guide.
NOTE:
When inserting the valve into valve guide, use spe-
cial care not to damage the oil seal lip.
(2) Set the cylinder head on ST1.
(3) Install the valve spring and retainer using
ST2.
NOTE:
Be sure to install the valve spring with its close-
coiled end facing the seat on cylinder head.
ST1 498267600 CYLINDER HEAD TABLE
ST2 499718000 VALVE SPRING REMOVER
ST2
ST1
(4) Compress the valve spring and install the
retainer key.
(5) After installing, tap the valve spring retainers
lightly with a wooden hammer for better seating.
2) Apply oil to the surfaces of the valve lifter.
3) Install the valve lifter.
E: INSPECTION
1. CYLINDER HEAD
1) Check for cracks or damage. Use liquid pene-
trant tester on the important sections to check for
fissures. Check that there are no marks of gas leak-
ing or water leaking on gasket installing surface.
2) Measure the warping of the cylinder head sur-
face that mates with cylinder block using a straight
edge (A) and thickness gauge (B).
If the warping exceeds the limit, correct the surface
by grinding it with a surface grinder.
Service limit:
0.035 mm (0.0014 in)
Grinding limit:
0.3 mm (0.012 in)
Standard height of cylinder head:
127.5 mm (5.02 in)
Cylinder Head
NOTE:
Uneven torque for the cylinder head bolts can
cause warping. When reinstalling, pay special at-
tention to the torque so as to tighten evenly.
2. VALVE SEAT
Inspect the intake and exhaust valve seats, and
correct the contact surfaces with a valve seat cutter
if they are defective or when valve guides are re-
placed.
Valve seat width W:
Standard:
Intake
0.6 — 1.4 mm (0.024 — 0.055 in)
ME-00124
Exhaust
1.2 — 1.8 mm (0.047 — 0.071 in)
Service limit:
Intake
1.7 mm (0.067 in)
Exhaust
2.2 mm (0.087 in)
ME(H4DOTC)-67
MECHANICAL
(A)
(B)
ME-00126
ME-00127