REPAIR INSTRUCTIONS, PART 1
Page 247
267
Figure 267 — Checking Valve Seat Runout
6. After checking runout, determine the
position of contact between the valve and
valve seat insert. Apply a dab of Prussian
Blue to the valve face at four points,
90 degrees apart.
7. Lower the stem of the valve into the valve
guide and allow the valve face to rest on the
seat insert. Rotate the valve 90 degrees on
the insert. Carefully remove the valve
without making contact with the valve face.
Properly ground inserts should show a full
pattern of contact on the insert.
Thoroughly clean the cylinder head after
checking the valve seat inserts and before
installing the valves.
Valve Spring Inspection
[213 MB]
1. Visually inspect the inside surfaces of the
spring coils. Also, feel the inside surfaces of
each spring for any indication of roughness
or grooving. If either of these conditions
exists, replace the spring.
2. Check the springs on the universal spring
tester J 22738-02 as shown in Figure 268.
Measured pressures should be within the
allowable limits when springs are
compressed to the specified “valve open”
and “valve closed” dimensions. Replace the
springs if pressures are not within the
specifications listed below:
— Outer Spring Specified Pressures
앫 At Valve Closed Height
: With
spring compressed to
1.968 inches (49.987 mm) —
119.5–131.5 lbs
(54.204–59.647 kg)
앫 At Valve Open Height
: With spring
compressed to 1.468 inches
(37.287 mm) — 195–215 lbs
(88.450–97.522 kg)
— Inner Spring Specified Pressures
앫 At Valve Closed Height
: With
spring compressed to
1.868 inches (47.447 mm) —
43.7–47.7 lbs (19.821–21.636 kg)
앫 At Valve Open Height
: With spring
compressed to 1.368 inches
(34.747 mm) — 66.3–74.3 lbs
(30.073–33.701 kg)
1. Arbor 2. Valve Guides
5-111.bk Page 247 Monday, July 10, 2006 2:26 PM
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