Ford Taurus/Sable 1986-1995 Repair Information

Knocking Valve Train


When the valve train is constantly making noise, check for the following, as necessary:

Loose rocker arms
Dirt or chips in the valve lifters
Excessive valve stem-to-guide clearance
Restrictions in valve lifter oil holes
Incorrect valve lifter(s)
Missing valve lock(s)
Faulty valve lifter check ball
Excessive valve lifter leak down
Reversed rocker arm nut (installed up-side-down)
Excessively worn camshaft lobes
Bent or worn pushrods
Excessively worn bridged pivots or rocker arms
Cocked or broken valve springs
Bent valve(s)
Worn valve lifter face(s)
Damaged lifter plunger or pushrod seat