03-Q0-3 1
Engine-Service
03-Q0-31
SERVICE PROCEDURES (Continued)
4.
Coat threads of mandrel with cutting oil. Thread
tapersert onto mandrel until one thread of
mandrel extends beyond tapersert.
TAPERSERT
ONE THREAD
EXTENDING
BEYOND
TAPERSERT
A647G-D
5. NOTE: A properly installed tapersert will be flush
to 1 .0 mm (0.039 inch) below spark plug gasket
seat.
Thread tapersert into tapped spark plug hole
using a torque wrench. Continue tightening
mandrel until torque wrench indicates 6 1 N·m (45
lb-ft).
.
6. To loosen mandrel for removal, hold mandrel
stationary and turn mandrel body approximately
one-half turn. Remove mandrel.
A6658-C
Cylinder Head Flatness
When a cylinder head is removed because of gasket
leaks, check the flatness of the cylinder head gasket
surface
so
it conforms to specification using Straight
Edge D83L -420 1-A or equivalent and Feeler Gauge
08 1 L -420 1-A or equivalent. For Specifications, refer
to Section 03-Q 1 A.
If
necessary to refinish the cylinder
head gasket surface, on the 3.8L plane or grind up to
0.254 mm (0.010 inch) from original cylinder head
gasket surface. Remove all burrs or scratches with an
oil stone.
If
surface has still not cleaned up after the
0.254 mm (0.0 1 0 inch) pass, replace the cylinder
head. On the 4.6L (2V) engine, replace the cylinder
head.
STRAIGHT EDGE D83L-4201-A
A23325-A
Valve Seat Runout
Check the valve seat runout with a Valve Seat Runout
Gauge as illustrated below. Follow the instructions of
the gauge manufacturer. If the runout exceeds the
wear limit, reface the valve and valve seat. For
Specifications, refer to Section 03-Q 1 A (3.8L) or
Section 03-Q1 B (4.6L).
VALVE SEAT
RUNOUT GAUGE
1997 Thunderbird, Cougar July 1 996