WARNING: AVOID GETTING OIL ON HOT EXHAUST MANIFOLDS.Section 03-00: Engine, Service | 1996 All F-150, F-250, F-350, F-Super Duty and Bronco Vehicles Equipped with 4.9L, 5.0L, 5.8L or 7.5L Gasoline Engines, and 7.3L Diesel Engines Workshop Manual |
NOTE: Static valve train analysis, with the engine (6007) off, is to be performed before dynamic valve train analysis, which is performed with the engine running.
Start the engine and, while running at idle, check for proper operation of all parts. Check the following.
Rocker Arm
Check for plugged oil feed in rocker arm (6564) or cylinder head (6049).
Also inspect for proper overhead valve train lubrication and examine for plugged oil feed in rocker arm.
If a condition of insufficient lubrication is suspected, accelerate the engine to 1100 to 1300 rpm with the transmission in NEUTRAL and the engine at normal operating temperature. Oil should flow from the rocker arm oil holes such that valve tips and rocker arms are well lubricated. If lubrication is insufficient for this condition to occur, check oil passages for blockage.
Push Rods
Check for bent push rods and restriction in oil passage.
Check for proper rotation of push rod (non-roller tappets).
Positive Rotator and Valve Spring Retainer Keys
Check for proper operation of positive rotator (intake valve only).
Valves and Cylinder Head
Check for plugged oil drainback holes.
Check for missing or damaged valve stem oil seals or guide-mounted oil seals.
WARNING: AVOID GETTING OIL ON HOT EXHAUST MANIFOLDS.
If a condition of insufficient lubrication is suspected, check oil passages for blockage, then accelerate the engine to 1200 rpm with the transmission in NEUTRAL and the engine at normal operating temperature. Oil should spurt from the rocker arm oil holes such that valve tips and rocker arms are well lubricated.