Subaru Legacy 2005 Service Manual page 1116

MECHANICAL
(6) Ensure that the cam sprocket 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,
none of cam on the camshafts push the intake
and exhaust valves down. (Under this condi-
tion, 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.
Timing Belt
(A)
(B)
ME-00086
ME(H4DOTC)-50
• Do not allow the camshafts to rotate in the di-
rection shown in the figure of upper one. Doing
this cause both the intake and exhaust valves
to lift simultaneously, resulting in interference
with their heads.
(B)
(B)
(A) Revolving direction
(B) Timing belt installation position
(A)
(A)
(A)
(A)
ME-00314