Hydraulic lifters use engine oil to keep zero lash in the valvetrain. When a lifter cannot hold oil, or the oil supply is poor, the valvetrain develops a light, rhythmic tick that follows engine speed.
Common Causes
- Low oil level, the wrong viscosity or sludge.
- A sticking or collapsed lifter.
- A worn cam lobe under the lifter.
- Lifter failure on cylinder-deactivation (AFM/DOD) engines.
Telling It Apart
An exhaust manifold leak can sound like a lifter tick, especially on a cold engine. A mechanic’s stethoscope helps locate the noise. A lifter tick usually comes from the top of the engine and does not fade as the exhaust heats up.
Repair Tips
- Check oil level and condition first.
- Inspect the cam lobes before installing new lifters.
- Replace lifter guides and retainer bolts as specified.
- Prime hydraulic lifters as directed and use the correct oil.
Evergreen Parts
Evergreen offers camshafts and lifters identified by engine or vehicle application. Use the Evergreen eCatalog to find the right part, and see where to buy Evergreen through our authorized distributors.
