Ford Thunderbird Manual page 29

03-oo-28
SERVICE PROCEDURES (Continued)
Replace the camshaft if not within specifications as
described. Refer to Specifications in Section 03-0 1 A
{3.8L) or Section 03-0 1 8 {4.6L).
Camshaft End Play
CAUTION: Prying against the camshaft sprocket
(6256} with the valve train load on the camshaft
can break or damage the camshaft sprocket.
Therefore the rocker arm adjusting nuts (if
equipped} must be backed off, or the rocker arm
(6564} must be loosened enough to free the
camshaft. After checking the camshaft end play,
adjust the valve clearance.
3.8L Engine
1. Push camshaft toward rear of engine. Install Dial
Indicator with Bracketry TOOL -420 1 -c or
equivalent so indicator point is on camshaft
sprocket retaining bolt.
Zero the dial indicator. Pull camshaft forward and
2.
release it. Compare dial indicator readi n g with
specifications. If end play is excessive, replace
camshaft thrust plate {6269).
Remove dial indicator.
3.
After replacing camshaft thrust plate, check end
4.
play again. If it is still out of specified range,
inspect camshaft and cylinder blocks {60 1 0) for
excessive wear.
4.6L Engine
1. NOTE: Dial indicator may also be installed on rear
of engine with indicator point placed on flat area
of camshaft end.
Push camshaft toward rear of engine. Install Dial
Indicator with Bracketry TOOL -420 1 -c or
equivalent so indicator point is on camshaft
sprocket bolt.
Engine-Service
Zero the dial indicator. Pull camshaft forward and
2.
release it. Compare dial indicator reading with
specifications. If end play is too tight, check for
binding or foreign material in camshaft thrust
plate. If end play is excessive, check for worn
camshaft thrust plate and replace cylinder head
as required.
Remove dial indicator.
3.
Camshaft Sprocket
Inspect the camshaft sprocket for warping or
abnormal wear. Inspect the sprocket teeth for wear,
deformation, chipping, or other damage. If necessary,
replace the camshaft sprocket as described in
Section 03-0 1 A.
A15376-C
Hydraulic Valve Tappets or Hydraulic Roller
Valve Tappets
CAUTION: If any part of the valve tappet (6500}
needs replacing, replace the entire valve tappet.
Internal tolerances for the valve tappets are very
critical. Mixing components from different valve
tappets may upset these tolerances, resulting In
improper valve tappet operation and possible
engine damage.
The valve tappets should be kept in proper sequence
so that they can be installed in their original position.
Inspect and test each valve tappet sep>arately so as
not to intermix. If a valve tappet is worn, it is
recommended that all valve tappets and camshaft
{6250) or rocker arms {6564) be replaced.
Cleaning
Thoroughly clean all the parts in clean solvent and
wipe them with a clean lint-free cloth.
03-oo-28
1997 Thunderbird, Cougar July 1 996