Lincoln Nautilus: Engine System - General Information / Valve Train Analysis - Gasoline. General Procedures
Valve Train Analysis - Engine Off, Valve Cover Removed
NOTE:
The following component inspections are used to diagnose valve train concerns.
-
Check for damaged or severely worn parts and correct assembly.
Valve Train Analysis - Camshaft Lobe Lift
-
Remove the spark plugs.
For additional information, refer to: Spark Plugs (303-07A)
.
For additional information, refer to: Spark Plugs (303-07B)
.
For additional information, refer to: Spark Plugs (303-07C)
.
For additional information, refer to: Spark Plugs (303-07D)
.
For additional information, refer to: Spark Plugs (303-07E)
.
-
Install the Dial Indicator Gauge with Holding Fixture so
the rounded tip of the dial indicator is on top of the camshaft lobe
and on the same plane as the valve tappet.
-
Rotate the crankshaft using a breaker bar and socket
attached to the crankshaft pulley retainer bolt. Rotate the crankshaft
until the base circle of the camshaft lobe is reached.
-
Zero the dial indicator. Continue to rotate the
crankshaft until the high-lift point of the camshaft lobe is in the
fully raised position (highest indicator reading).
-
To check the accuracy of the original dial indicator
reading, continue to rotate crankshaft until the base circle is reached.
The indicator reading should be zero. If zero reading is not obtained,
repeat Steps 2 through 5.
-
If the lift on any lobe is below specified service
limits, install a new camshaft and camshaft roller followers or valve
tappets.
-
Install the spark plugs.
For additional information, refer to: Spark Plugs (303-07A)
.
For additional information, refer to: Spark Plugs (303-07B)
.
For additional information, refer to: Spark Plugs (303-07C)
.
For additional information, refer to: Spark Plugs (303-07D)
.
For additional information, refer to: Spark Plugs (303-07E)
.
Check
NOTE:
Refer to the appropriate Section 303-01 for the specification.
Measure the diameter of each intake and exhaust valve
stem at the points shown...
Other information:
Special Tool(s) /
General Equipment
Interior Trim Remover
Remove the following items:
On both sides.
Remove the A-pillar trim panels.
Refer to: A-Pillar Trim Panel (501-05 Interior Trim and Ornamentation, Removal and Installation).
On both sides.
Remove the B-pillar trim panels.
Refer to: B-Pillar Trim Panel (501-05 Interior Trim and Ornamentation, Removal and Inst..
Starting and Stopping the Engine – Warning Lamps
Malfunction Indicator Lamp
If it illuminates when the
engine is
running, the on-board diagnostics
system is detecting a malfunction
of the vehicle emission control system.
If it flashes, engine misfire could be
occurring. Increased exhaust gas
temperatures could damage the catalytic
converter or other vehicle components.
Avoid heavy accel..