Ford 2003 Mustang Workshop Manual page 851

excessive connecting rod bearing clearance
Valve Train Analysis—Engine Off—Valve Cover Removed
Check for damaged or severely worn parts and correct assembly. Make sure correct parts are used
with the static engine analysis as follows.
Valve Train Analysis—Engine Off, Rocker Arm
Check for loose mounting bolts, studs and nuts.
Check for plugged oil feed in the rocker arms (6564) or cylinder head.
Valve Train Analysis—Engine Off, Camshaft Roller Followers and Hydraulic Lash Adjusters,
Overhead Camshaft
Check for loose mounting bolts on camshaft carriers.
Check for plugged oil feed in the camshaft roller followers, lash adjusters or cylinder heads.
Valve Train Analysis—Engine Off, Camshaft—Engines
Check for broken or damaged parts.
Valve Train Analysis—Engine Off, Push Rods
Check for bent push rods (6565) and restricted oil passage.
Valve Train Analysis—Valve Springs
Check for broken or damaged parts.
Valve Train Analysis—Engine Off, Valve Spring Retainer and Valve Spring Retainer Keys
Check for correct seating of the valve spring retainer key (6518) on the valve stem and in valve
spring retainer (6514).
Check for correct seating on the valve stem.
Valve Train Analysis—Engine Off, Valves and Cylinder Head
Check for plugged oil drain back holes.
Check for worn or damaged valve tips.
Check for missing or damaged guide-mounted valve stem seal.
Check collapsed valve tappet gap.
Check installed valve spring height.
Check for missing or worn valve spring seats.
Check for plugged oil metering orifice in cylinder head oil reservoir (if equipped).
Static checks (engine off) are to be made on the engine prior to the dynamic procedure.