Subaru Legacy 2004 Service Manual page 1157

MECHANICAL
(4) Align single line mark (A) on exhaust cam
sprocket (LH) with notch (B) on timing belt cover
by turning the sprocket counterclockwise (as
viewed from front of engine).
(5) Align single line mark (A) on intake cam
sprocket (LH) with notch (B) on timing belt cover
by turning the sprocket clockwise (as viewed
from front of engine).
Ensure double lines (C) on intake and exhaust
cam sprockets are aligned.
Timing Belt
(B)
(A)
ME-00084
(B)
(A)
(C)
ME-00085
ME(H4DOTC)-46
(6) Ensure that the cam and crank sprockets
are positioned properly.
CAUTION:
• Intake and exhaust camshafts for this DOHC
engine can be independently rotated with the
timing belts removed. As can be seen from the
figure, if the intake and exhaust valves are lifted
simultaneously, their heads will interfere with
each other, resulting in bent valves.
(A) Intake camshaft
(B) Exhaust camshaft
• When the timing belts are not installed, four
camshafts are held at the "zero-lift" position,
where all cams on camshafts do not push the
intake and exhaust valves down. (Under this
condition, all valves remain unlifted.)
• When the camshafts are rotated to install the
timing belts, #2 intake and #4 exhaust cam of
camshafts (LH) are held to push their corre-
sponding valves down. (Under this condition,
these valves are held lifted.) Camshafts (RH)
are held so that their cams do not push valves
down.
• Camshafts (LH) must be rotated from the "ze-
ro-lift" position to the position where the timing
belt is to be installed with the smallest possible
angle, in order to prevent mutual interference of
intake and exhaust valve heads.
(A)
(B)
ME-00086