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03-0G-27
Engine-Service
03-0G-27
SERVICE PROCEDURES (Continued)
Camshaft Runout
Inspect the camshaft runout by setting the No. 1 and
No. 4 journals on V-blocks and using Dial Indicator with
Bracketry TOOL -420 1 -c or equivalent.
DIAL
INDICATOR WITH BRACKETRY
TOOL-4201 -C
AA0874-A
If
the maximum runout of the camshaft is not within
specifications as described in Section 03-01 A (3.8L)
or Section 0 3-Q 1 B (4.6L), replace the camshaft.
Cam Lobes
3.8L Englne
Inspect the camshaft lobes for scoring and signs of
abnormal wear. Lobe pitting except in the general area
of the lobe toe does not harm camshaft operation;
therefore, the camshaft should not be replaced unless
the lobe lift loss has exceeded specification or pitting
has occurred in the lobe lift area.
Cam Lobe Lift
The lift of the camshaft lobes can be checked with the
camshaft installed in the engine or on centers.
To measure the camshaft lobe lift, proceed as follows:
1 . Measure distance between major (A-A) and minor
(B-B) diameters of each camshaft lobe with a
Vernier caliper and record readings. The
difference in readings on each camshaft diameter
is lobe lift.
2.
If
readings do not meet specification, replace
camshaft. For Specifications, refer to Section
03-Q1A.
6.35 mm 6.35 mm
0.25 INCH 0.25 INCH
A
NO PITTING
ALLOWED IN
THIS AREA
DIMENSION A MINUS
DIMENSION B EQUALS
THE CAM LOBE LIFT
A23322·B
Camshaft Journal Oil Clearance
4.6L Engine
1 . Remove all foreign material and oil from the
camshaft journals and cylinder head bearing
surfaces.
2. Set the camshaft into the cylinder head.
3.
Position Plastigage material on top of the journals
in the axial direction.
4.
Install cylinder head journal caps as described in
Section 03-Q 1 B.
5.
Loosen the cylinder head journal cap bolts as
described in Section 03-Q 1
B.
6. Remove cylinder head journal caps as described
in Section 03-Q 1 B.
7. Measure the camshaft oil clearance. The
standard camshaft oil clearance should be
0.025-Q.076 mm (0.00 1 o-o.0029 inch).
Maximum service limit is 0. 1 2 1 mm (0.0048
inch).
Camshaft Journal Diameters
Measure the journal diameters in the
X
and
Y
directions at points A and B as shown.
y
JOURNAL
A16624·B
1 997 Thunderbird, Cougar July 1996
Содержание Thunderbird
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