03-0Q-35
Engine-Service
03-oo-35
SERVICE PROCEDURES (Continued)
Valve Guide Inner Diameter
Measure the inner diameter of the valve guides at the
points shown.
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A14465-B
If
valve guide is not within specification as listed in
Section 03-o1A (3.8L) or Section 03-o 1 8 (4.6L), ream
the valve guide as described and install a valve with an
oversize stem.
Valve Stem Diameter
Measure the diameter of each valve at the points
shown.
A23529-A
If the stem diameter is not within specification as
described in Section 03-o 1A (3.8L) or Section 03-01 8
(4.6L), replace the valve.
Valve Spring Length Inspection
Inspect each valve spring for cracks or damage and
replace as necessary. Measure the free length of each
valve spring as shown.
A1 4570-B
If
a valve spring is not within specifications as
described in Section 03-o 1 A (3.8L) or Section 03-o 1 8
(4.6L), replace the valve spring.
Valve Spring Tension
Inspect the valve spring, valve spring retainers and
valve spring retainer keys for wear or damage.
Discard any damaged parts.
NOTE: Make sure the valve springs are reassembled
to their OWN ORIGINAL DAMPERS by pushing
damper on the valve spring. DO NOT OPEN damper
with any kind of tool when reassembling.
Check the valve springs for proper pressure at the
specified valve spring lengths using Valve Clutch
Spring Tester TOOL -65 13-DD or equivalent. Weak
valve springs cause poor engine performance.
Replace any valve spring not within specification. For
Specifications, refer to Section 03-o1 A (3.8L) or
Section 03-0 1 8 (4.6L). Manually rotating the valve
spring while installed in the engine will not determine
condition of valve springs.
APPLY TORQUE UNTIL
CLICK IS HEARD, READ
TORQUE WRENCH AND
MULTIPLY READING
BY TWO
A8516-C
1997 Thunderbird, Cougar July 1996