Subaru Impreza 3 / Impreza WRX / Impreza WRX STI. Service manual — part 79
ME(STI)-78
Cylinder Head
MECHANICAL
5. VALVE SPRING
1) Check the valve springs for damage, free length,
and tension. Replace the valve spring if it is not
within the standard value presented in the table.
2) To measure the squareness of the valve spring,
stand the valve spring on a surface plate and mea-
sure its deflection at the top of the valve spring us-
ing a try square.
6. INTAKE AND EXHAUST VALVE OIL
SEAL
1) For the following, replace the oil seal with a new
part. See the procedure 2) and subsequent for re-
placement procedures.
• When the lip is damaged.
• When the spring is out of the specified position.
• When readjusting the surfaces of valve and
valve seat.
• When replacing the valve guide.
2) Place the cylinder head on ST1, and use ST2 to
press-fit the oil seal.
ST1 498267600
CYLINDER HEAD TABLE
ST2 498857100
VALVE OIL SEAL GUIDE
NOTE:
• Apply engine oil to oil seal before press-fitting.
• When press-fitting the oil seal, do not use a ham-
mer to strike in.
• The intake valve oil seals and exhaust valve oil
seals are distinguished by their colors.
Color of rubber part:
Intake [Gray]
Exhaust [Green]
Free length
mm (in) 53.48 (2.106)
Tension/spring
height
N (kgf, lbf)/mm
(in)
Set
204.6 — 235.4 (20.86 — 24.00,
46.00 — 52.93)/36.0 (1.417)
Lift
363.5 — 401.7 (37.07 — 40.96,
81.73 — 90.32)/26.7 (1.051)
Squareness
2.5°, 2.3 mm (0.091 in) or less
ME-00283
ME-00133
ST2
ME(STI)-79
Cylinder Head
MECHANICAL
7. VALVE LIFTER
1) Check the valve lifter visually.
2) Measure the outer diameter of valve lifter.
Outer diameter of valve lifter:
Standard
34.959 — 34.975 mm (1.3763 — 1.3770 in)
3) Measure the inner diameter of valve lifter mating
surface on cylinder head.
Valve lifter mating surface inner diameter:
Standard
34.994 — 35.016 mm (1.3777 — 1.3786 in)
4) Check the clearance between valve lifter and
valve lifter mating surface. The clearance can be
checked by measuring the outer diameter of valve
lifter and the inner diameter of valve lifter. If it ex-
ceeds the standard or offset wear occurs, replace
the cylinder head.
Valve lifter and valve lifter mating surface clear-
ance:
Standard
0.019 — 0.057 mm (0.0007 — 0.0022 in)
ME-00134
ME-00135
ME(STI)-80
Cylinder Block
MECHANICAL
20.Cylinder Block
A: REMOVAL
NOTE:
Before conducting this procedure, drain the engine
oil completely.
1) Remove the engine from the vehicle. <Ref. to
ME(STI)-30, REMOVAL, Engine Assembly.>
2) Remove the rear side belt. <Ref. to ME(STI)-40,
REAR SIDE BELT, REMOVAL, V-belt.>
3) Remove the intake manifold. <Ref. to FU(STI)-
17, REMOVAL, Intake Manifold.>
4) Remove the crank pulley. <Ref. to ME(STI)-47,
5) Remove the timing belt cover. <Ref. to ME(STI)-
49, REMOVAL, Timing Belt Cover.>
6) Remove the timing belt. <Ref. to ME(STI)-50,
7) Remove the cam sprocket. <Ref. to ME(STI)-59,
8) Remove the crank sprocket. <Ref. to ME(STI)-
9) Remove the generator and A/C compressor with
their brackets.
10) Remove the camshaft. <Ref. to ME(STI)-61,
11) Remove the cylinder head. <Ref. to ME(STI)-
12) Remove the clutch disc and cover. <Ref. to CL-
11, REMOVAL, Clutch Disc and Cover.>
13) Remove the flywheel. <Ref. to CL-14, REMOV-
14) Remove the oil separator cover.
15) Remove the water by-pass pipe for heater.
16) Remove the oil filter. <Ref. to LU(STI)-31, RE-
17) Remove the oil cooler. <Ref. to LU(STI)-24,
18) Remove the water pump. <Ref. to CO(STI)-15,
19) Remove the bolts which secure oil pump to cyl-
inder block.
NOTE:
When disassembling and checking the oil pump,
loosen the relief valve plug before removing the oil
pump.
20) Remove the oil pump from cylinder block using
a flat tip screwdriver.
CAUTION:
Be careful not to scratch the mating surface of
the cylinder block and oil pump.
21) Remove the front oil seal from the oil pump.
22) Remove the oil pan.
(1) Set the part so that the cylinder block LH is
on the upper side.
(2) Remove the bolts which secure oil pan to
cylinder block.
(3) Insert an oil pan cutter blade between cylin-
der block-to-oil pan clearance and remove the
oil pan.
CAUTION:
Do not use a screwdriver or similar tools in
place of oil pan cutter.
23) Remove the oil strainer.
24) Remove the baffle plate.
LU-00015
ME-00138
ME(STI)-81
Cylinder Block
MECHANICAL
25) Remove the water tank pipe assembly from the
cylinder block RH.
NOTE:
Pinch the clamp of the water tank pipe assembly by
fitting the cut out in the ST with the protrusion on
the clamp as shown in the figure, and unlock the
clamp.
ST 18353AA000 CLAMP PLIERS
ME-04374
ST
(1)
Service hole plug
(4)
Piston pin
(7)
Seal washer
(2)
Gasket
(5)
Service hole cover
(8)
Washer
(3)
Snap ring
(6)
O-ring
ME-04723
(3)
(4)
(2)
(1)
(3)
(4)
(5)
(6)
(2)
(3)
(2)
(1)
(3)
(4)
(4)
(8)
(7)
(1)
(7)
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