TM 5-4320-300-14
6-7. CYLINDER HEAD AND BLOCK(CONT)
Location/item
Action
Remarks
12. Valve guides
Use a guide brush to clean the inside of valve
Valve guides and
guides, and inspect the guides for fractures,
valve seat inserts
chipping, scoring, or excessive wear. Then
can be inspected
measure the inside diameter of each valve
and cleaned with-
guide and record the reading.
out being removed
from the cylinder
head.
13. Valve stem
Measure outside diameter of valve stem and
and guide
record the reading. Subtract stem diameter
differential
reading from guide reading. The difference
should be no greater than 0.005 inch
(0.127 mm).
14. Valve springs,
Inspect for pitting, fracture, excessive wear, or
locks, caps,
other damage.
and seats
15. Spring load
If springs are in good condition, check spring
load. A load of 25 pounds (11.34 kg) should
compress a four-valve cylinder head spring to
1.93 inches (49.02 mm) maximum. The differ-
ence in the load between any pair of valve
springs should not exceed 6 pounds (2.7 kg).
16. Valve guide
Remove and discard.
oil seals
17. Valve seat
Inspect for wear, pitting, cracking, and proper
inserts
valve seat angle (31 degrees).
6-31
