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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
left-hand camshafts are held to push their corresponding
valves down. (Under this condition,
these valves are held lifted.) Right-side camshafts
are held so that their cams do not push
valves down.
• Left-hand camshafts must be rotated from
the “zero-lift” position to the position where the
timing belt is to be installed at as small an angle
as possible, in order to prevent mutual interference
of intake and exhaust valve heads.
• Do not allow the camshafts to rotate in the direction
shown in the figure as this causes both