Hydraulic Lifter Tick (AU especially, all models)
Symptoms
A ticking or tapping noise from the top of the engine, often worst on cold start. May persist for minutes or be constant. The noise comes from the rocker cover area.
Cause
The hydraulic lash adjusters (HLAs) wear internally and lose their ability to maintain zero valve lash. Oil quality and change intervals directly affect lifter life. The AU seems most susceptible, though all SOHC Falcons can develop this issue at high mileage.
Fix
Replace all 12 lifters.
The job requires removing the rocker assembly, unbolt the rocker shaft pedestals evenly (one turn at a time, outside to centre), remove the assembly, and use a pin punch and small hammer to tap out each lifter.
Install new lifters greased on the outside, with the shim slot facing upward (oil feed).
Reassemble centre to outside, torque pedestal bolts to 22 Nm.
The job takes 4-6 hours.
Parts: $180-250 from aftermarket suppliers.
Ford charges $82 each ($984 for a set).
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