Ford LSG 875 Service Manual page 18

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l-14
BASIC ENGINE
l-14
CLEANING AND INSPECTION (Continued)
Install the tool on the valve stem until it is fully
seated, and tighten the knurled set screw firmly.
Permit the valve to drop away from its seat until
the tool contacts the upper surface of the valve
guide.
DIAL INDICATOR
\
DIAL
VALVE\ STEM
INDICATOR
CLEARANCE TOOL
BRACKETRY
T65T-6505-H
D78P-4201 -F
A96251 A
Position the dial indicator with its flat tip
against the center portion of the tool' s spherical
section at approximately SO degrees to the valve
stem axis. Move the tool back and forth in line
with the indicator stem. Take a reading on the
dial indicator without removing the tool from the
valve guide upper surface. Divide the reading by
two, the division factor for the tool.
Check the springs for proper pressure at the
specified spring lengths (Tool 65130DD). Weak
valve springs cause poor engine performance.
Replace any spring not within specifications.
Check each spring for squareness using a
steel square and a flat surface. Stand the spring
and square on end on the flat surface. Slide the
spring up to the square. Revolve the spring
slowly and observe the space between the top
coil of the spring and the square. The out-of-
square limits are 5/64 inch.
Follow the same procedure to check new
valve springs before installation. Make certain
the proper spring (color coded) is installed.
APPLY TORQUE UNTIL
CLICK IS HEARD, READ
TORQUE WRENCH AND
MULTIPLY READING
BY TWO
VALVE SPRING
TESTER
TOOL-651 3-DD
VALVE
SPRING
6513
SET KNOB TO
\COMPRESSED
LENGTH OF
SPRING
A9077-1
B
SPECIFICATION
CLOSED
COIL END
DOWNWARD
A9248-1 A