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Home >> Jeep >> 2018 >> Grand Cherokee Laredo, RWD >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 27 (5.7L Engine (Service Information)) >> Engine Block >> Lifter(S), Hydraulic, Roller >> Diagnosis And Testing >> Diagnosis And Testing - Hydraulic Tappets >> High

Diagnosis And Testing - Hydraulic Tappets: High

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If the oil level is above the FULL mark, it is possible for the connecting rods to dip into the oil. With the engine running, this condition could create foam in the oil pan. Foam in the oil pan would be fed to the hydraulic tappets by the oil pump causing them to lose length and allow the valves to seat noisily.