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Home >> Jeep >> 2018 >> Grand Cherokee Laredo, RWD >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 12 (6.4L Engine (Service Information)) >> Engine Block >> Lifter(S), Hydraulic, Roller >> Diagnosis And Testing >> Diagnosis And Testing - Hydraulic Roller Lifters >> Notes

Diagnosis And Testing - Hydraulic Roller Lifters: Notes

WARNING: This page is about a different variant/trim than selected.

Before disassembling any part of the engine to correct lifter noise, check the oil pressure. If the vehicle has no oil pressure gauge, install a reliable gauge at the pressure sending-unit. The pressure should be between 207-552 kPa (30-70 psi) at 3, 000 RPM.

Check the oil level after the engine reaches normal operating temperature. Allow 5 minutes to stabilize oil level, check dipstick. The oil level in the pan should never be above the FULL mark or below the ADD OIL mark on the dipstick. Either of these two conditions could be responsible for noisy lifters.

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