Cylinder Head Flatness; Valve Seat Runout; Valve Stem-To-Valve Guide Clearance - Ford LRG-423 Service Manual

01-28
Enaine Service
01-28
SERVICE PROCEDURES (Continued)
5. NOTE: A properly installed taperset will be flush
to one millimeter below spark plug gasket seat.
Thread taperset into tapped spark plug hole
using a torque wrench. Continue tightening
mandrel until torque wrench indicates 61 Nom
(45 lb-ft).
;.
To loosen mandrel for removal, hold mandrel
stationary and turn mandrel body approximately
one-half turn. Remove mandrel.
TURN MANDREL
1\
\
j,
HOLD MANDREL
STATIONARY
Cylinder Head Flatness
NOTE: Do not plane or grind off more than 0.254mm
(0.010 inch).
When a cylinder head is removed because of gasket
leaks, check the flatness of the cylinder head gasket
surface for conformance to specification. For
specifications, refer to General Specifications in this
section. If necessary, refinish the cylinder head gasket
surface.
k 1 Al5267-A
Valve Seat Runout
Check the valve seat runout with Valve Seat Runout
Gauge D81 P-6002-E, or equivalent, 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 02.
VALVE SEAT
RUNOUT GAUGE
08 1 P-6002-E
A72754
Valve Stem-to-Valve Guide Clearance
1.
Check the valve stem-to-valve guide clearance of
each valve in its respective valve guide (6510)
with Valve Stem Clearance Tool TOOL-6505-E,
or equivalent. Use a flat-end indicator point.
2.
Install TOOL-6505-E to cylinder head. Permit the
valve to drop away from its seat 9.55mm (0.375
inch). Contact tip of valve stem with dial indicator
and tighten clamping knob.
DIAL
INDICATOR
VALVE STh/l
CLFAFWNCE
TOOL-6505-E
Al 0707-D
3. Position the dial indicator with its flat tip against
the center portion of the tool' s spherical section at
approximately 90 degrees to the valve stem axis.