Subaru Impreza 3 / Impreza WRX / Impreza WRX STI. Service manual — part 75
ME(STI)-62
Camshaft
MECHANICAL
11) Remove the clip (A) which hold the engine har-
ness to the rocker cover RH.
12) Remove the air duct B (B) from the rocker cov-
er LH and the air duct A (A).
13) Remove the ignition coil. <Ref. to IG(STI)-7,
14) Disconnect PCV hose (A) and vacuum hose
(B) from the rocker cover.
NOTE:
Pinch the clamp of the PCV hose (A) 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
15) Remove the rocker cover.
ME-05041
(A)
ME-04953
(B)
(A)
ME-04374
ST
ME-05768
(A)
(B)
(A)
(B)
ME(STI)-63
Camshaft
MECHANICAL
16) Remove the union bolt without filter (without
protrusion) which secures the oil pipe to the front
camshaft cap.
17) Loosen the upper side of the front camshaft
cap and the intake camshaft cap bolts equally, a lit-
tle at a time in alphabetical sequence shown in the
figure.
18) Loosen the lower side of the front camshaft cap
and the exhaust camshaft cap bolts equally, a little
at a time in alphabetical sequence shown in the fig-
ure.
19) Remove the front camshaft cap.
20) Remove the intake camshaft caps and intake
camshaft.
(A) Union bolt with filter (with protrusion)
(B) Union bolt without filter (without protrusion)
(C) Oil pipe RH
(D) Oil pipe LH
(E) Gasket
ME-05030
(A)
(B)
(D)
(A)
(B)
(C)
(E)
(E)
(E)
(E)
(E)
ME-05978
(A)
(B)
(A)
(E)
(F)
(B)
(D)
(C)
(E)
(F)
(D)
(C)
ME-05979
(A)
(B)
(E)
(F)
(D)
(C)
(A)
(E)
(F)
(B)
(D)
(C)
ME(STI)-64
Camshaft
MECHANICAL
21) Remove the exhaust camshaft caps and ex-
haust camshaft.
NOTE:
Arrange camshaft caps in order so that they can be
installed in their original positions.
22) Remove the oil seal.
CAUTION:
Do not scratch the journal surface when remov-
ing the oil seal.
B: INSTALLATION
1) Install the camshaft.
Apply engine oil to the cylinder head at camshaft
journal installation location before installing the
camshaft. Install the camshaft so that each valve is
close to or in contact with base circle of the cam
lobe.
NOTE:
• Set the camshaft to the position shown in the figure.
• When set at the position shown in the figure, it is
not necessary to rotate the camshaft RH when in-
stalling the timing belt, but it is necessary to rotate
the camshaft LH slightly.
Intake camshaft LH:
Rotate 80° clockwise.
Exhaust camshaft LH:
Rotate 45° counterclockwise.
2) Install the camshaft cap.
(1) Apply small amount of liquid gasket to the
mating surface of cap.
NOTE:
• Install within 5 min. after applying liquid gasket.
• Do not apply liquid gasket excessively. Applying
excessively may cause excess gasket to come out
and flow toward oil seal, resulting in oil leak.
Liquid gasket:
THREE BOND 1217G (Part No. K0877Y0100)
or equivalent
Liquid gasket applying diameter:
Mating surfaces other than ranges A and B
2
±
0.5 mm (0.0787
±
0.0197 in)
Mating surfaces of ranges A and B
3
±
1 mm (0.1181
±
0.0394 in)
(2) Apply a thin coat of engine oil to the cap
journal surface, and install the camshaft cap to
the camshaft.
(A) Cylinder head RH
(B) Cylinder head LH
(a) Intake camshaft
(b) Exhaust camshaft
ME-05038
(B)
(A)
(a)
(b)
11
77.5
(b)
(a)
77.5
11
(A) Range A
(B) Range B
(C) Liquid gasket applying position of mating sur-
faces of ranges other than A and B
(D) Liquid gasket applying position of mating sur-
faces of ranges A and B
(E) 44.8 mm (1.7638 in)
(F) 65 mm (2.5591 in)
(G) φ2±0.5 mm (0.0787±0.0197 in)
(H) 0.5±0.5 mm (0.0197±0.0197 in)
(I) φ3±1 mm (0.1181±0.0394 in)
(J) 1 mm (0.0394 in) or less
ME-05769
(J)
(I)
(B)
(F)
A
A
B
B
B
(A)
(E)
A
A
B
B-B
(D)
A-A
(C)
(G)
(H)
ME(STI)-65
Camshaft
MECHANICAL
(3) Gradually tighten the camshaft cap in at
least two steps, in alphabetical order shown in
the figure, and then tighten to the specified
torque.
Tightening torque:
T1: 9.75 N·m (1.0 kgf-m, 7.2 ft-lb)
T2: 20 N·m (2.0 kgf-m, 14.8 ft-lb)
(4) After tightening the camshaft cap, ensure
the camshaft rotates only slightly while holding
it at base circle.
3) Apply a thin coat of engine oil to the periphery of
the camshaft oil seal and oil seal lip, and install the
oil seal on the camshaft using ST1 and ST2.
NOTE:
Use a new oil seal.
ST1 499587600
OIL SEAL INSTALLER
ST2 499597200
OIL SEAL GUIDE
4) Install the oil pipe to the front camshaft cap using
the union bolt without filter (without protrusion).
NOTE:
Use a new gasket.
Tightening torque:
29 N·m (3.0 kgf-m, 21.4 ft-lb)
5) Install the tensioner bracket.
Tightening torque:
24.5 N·m (2.5 kgf-m, 18.1 ft-lb)
ME-05980
(G)
(E)
(C)
(A)
(K)
(L)
(J)
(I)
(B)
(D)
(H)
(F)
(G)
(E)
(C)
(A)
(K)
(L)
(J)
(I)
(B)
(D)
(H)
(F)
T1
T2
T1
T2
T2
T2
T1
T1
ME-05002
ST1
ST2
(A) Union bolt with filter (with protrusion)
(B) Union bolt without filter (without protrusion)
(C) Oil pipe RH
(D) Oil pipe LH
(E) Gasket
ME-05033
(A)
(B)
(D)
(A)
(B)
(C)
(E)
(E)
(E)
(E)
(E)
ME-04984
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