ENGINE <NON-TURBO>
-
Base Engine
I-5
CRANKSHAFT AND CAMSHAFT TIMING
L
This engine does not have broken-belt valve clear-
ance. The reason for this design is to improve hydro-
carbon emissions by eliminating valve pockets cut
into the pistons that would normally provide this
clearance. If the engine is rotated with the timing
belt removed or the cam timing is set improperly,
the valves will hit the pistons. However, if the
cam-
AUTOMATIC TENSIONER
This engine uses a timing-belt cover, crankshaft
sprocket, timing belt, “automatic” belt tensioner, two
camshafts, and camshaft sprockets. The belt ten-
sioner is spring activated, hydraulically dampened,
and self contained. The tensioner consists of a free
piston, orifice, silicone fluid, a spring, check ball,
and a plunger rod. The check ball is seated as
the plunger rod is depressed, trapping the fluid and
N7lAB07AA
shafts are out of time on engines, the valves can
strike each other as well as the pistons. This is
due to the intake and exhaust valve-to-valve interfer-
ence design. Therefore, it is necessary to time the
camshafts and crankshaft simultaneously to prevent
damage to pistons, exhaust valves, and intake
valves.
N71ABOBAA
creating a high pressure area. The area below the
plunger rod is the high pressure area for hydraulic
dampening. The area between the free piston and
the plunger rod is a low pressure area. And, the
area above the free piston provides a place to con-
tain aerated fluid. The spring below the plunger
rod holds a constant pressure for the belt tensioner
pivot bracket.
Dust seal
Aerated
Low
fluid
pressure
area
Free piston inner seal
Compression ring
‘W
CEN0099
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