Service manual

10. Measure the valve stem-to-guide clearance.
Excessive valve stem-to-guide clearance may
cause an excessive oil consumption and may also
cause a valve to break. Insufficient clearance
will result in noisy and sticky functioning of
the valve and will disturb the engine assembly
smoothness.
10.1. Clamp the
J 8001 on the exhaust port side
of the cylinder head.
10.2. Locate the dial indicator so that the
movement of the valve stem from side
to side, crosswise to the cylinder head, will
cause a direct movement of the dial
indicator stem.
The dial indicator stem must contract the
side of the valve stem just above the
valve guide.
10.3. Drop the valve head about 1.6 mm
(0.063 in) off the valve seat.
10.4. Use light pressure and then move the
valve stem from side to side in order to
obtain a clearance reading. Refer to
Engine Mechanical Specifications (5.0 L)
or Engine Mechanical Specifications
(5.7 L)
.
Valve Guide Reaming/Valve and Seat
Grinding
SIE-ID = 784242
Tools Required
•
J 5830-02 Valve Guide Reamer Set
•
J 8001 Dial Indicator Set
1. Measure the valve stem-to-guide clearance.
Refer to
Cylinder Head Cleaning and Inspection .
35214
35214
Engine Engine Mechanical - 5.0L and 5.7L 6-79
2002 - Unit Repair (May 25, 2001)