The Jeep Grand Cherokee Pushrod's chief benefit is the direct transfer of camshaft motion to the valves, which provides good breathing and strong low-end torque. Many Jeep V8 and inline-six engines use an overhead valve setup. The cam is positioned relatively low, and lifters follow the cam's lobes. Each Pushrod runs up to the rockers that tip the intake and exhaust valves, admitting the mix in and gases out. The simple transmission results in a compact engine height, a trait that the Grand Cherokee values for its packaging and durability. As a result, there are fewer moving parts and less mass. A worn cam can produce an overpowering lash, causing a Pushrod to bend or a rocker to break, which will be indicated by a ticking sound, a misfire, or that the power fades at high revs. Jeep owners have had great fortune with this heritage setup. The Pushrod design has stayed constant through the different model years, with the variations between them due to spring pressures rather than design. The later Grand Cherokee productions see stronger materials introduced to withstand the heat effects. Meanwhile, Grand Cherokee SRT sees even greater load but still uses the same Pushrod motion principles. This means every Pushrod keeps cycling, showcasing the durability of the Jeep system after years of road suppression.
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