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DESCRIPTION AND OPERATION
How Spring-Loaded Push Rods Operate
During the “valve opening” cycle, as the lifter
roller rides up the ramp of the cam lobe, the push
rod spring compresses, making the push rod a
solid assembly that transmits the upward force of
the lifter to the rocker arm. The push rod spring
never becomes fully compressed; the push rod
becomes solid when the internal stops of the
upper and lower spring seats contact each other.
During the valve closing cycle, as the lifter roller
travels down the ramp and into the cam lobe
sub-base circle area, the push rod spring
expands making the push rod longer, thus
eliminating excessive lash from the valve train.
Spring pressure keeps the roller contact with the
cam and eliminates valve clatter.
31
Figure 31 — Spring-Loaded Push Rod Operation
5-111.bk Page 36 Monday, July 10, 2006 2:26 PM
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