Subaru 2009 IMPREZA, Service Manual

Page: 285 / 3619

ME(H4SO)-67
Cylinder Head
MECHANICAL
1) Install the valve spring and valve.
(1) Coat the stem of each valve with engine oil
and insert the valve into 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 ST.
ST 498267800 CYLINDER HEAD TABLE
(3) Install the valve spring and retainer.
NOTE:
Be sure to install the valve spring with its close-
coiled end facing the cylinder head side.
(4) Set the ST on valve spring.
ST 499718000 VALVE SPRING REMOVER
(5) Compress the valve spring and fit the valve
spring retainer key.
(6) After installing, tap the valve spring retainers
lightly with a plastic hammer for better seating.
E: INSPECTION
1. CYLINDER HEAD
1) Check for cracks or damage. Use liquid penetrant
tester on the important sections to check for fissures.
Check that there are no marks of gas leaking or wa-
ter leaking on gasket installing surface.
2) Place the cylinder head on the ST.
ST
498267800 CYLINDER HEAD TABLE
3) 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.
Warping limit:
0.035 mm (0.0014 in)
Grinding limit:
0.1 mm (0.004 in)
Standard height of cylinder head:
97.5 mm (3.84 in)
NOTE:
Uneven torque for the cylinder head bolts can
cause warpage. When reassembling, pay special
attention to the torque so as to tighten evenly.
(A) Retainer key
(B) Valve spring
(C) Retainer
ME-00280
ST
ME-02816
(B)
(B)
(A)
(C)
(C)
ST
(A)
(B)
ME-00285