TM 5-3810-306-34
c.
Lap corresponding valve (12) or (13) to each
seat (14) or (15) and grind as necessary. (Refer
WARNING
to page 4-13.)
Dry cleaning solvent P-D-680 is toxic
and flammable.
Wear protective
3. INSTALL VALVE SPRING GUIDES (10).
goggles and gloves and use only in a
well ventilated area. Avoid contact
4. INSTALL NEW VALVE STEM SEALS (8) AND (9).
with skin, eyes, and clothes and don't
breathe vapors. Do not use near
NOTE
open flame or excessive heat. The
flash point is 100F-138F (380-590C).
Intake and exhaust seals are
If you become dizzy while using
different. Be sure to use correct seal.
cleaning solvent, get fresh air
immediately and get medical aid. If
5. INSTALL VALVES (12) AND (13).
contact with eyes is made, wash your
eyes with water and get medical aid
CAUTION
immediately.
Be sure valves (12) and (13) are
g. Clean the valve guide bore with cleaning solvent.
installed in corresponding valve
bores as removed and/or lapped.
2. IF REMOVED, INSTALL NEW VALVE SEATS (14)
AND (15).
a. Lubricate valve stems with SAE 90W engine oil
and insert valves (12) and (13) in corresponding
a. Freeze new valve seats at 0F (18C) for 30
valve bores.
minutes before attempting to install.
b. Position valve springs (7) and valve spring
b. Remove new seats (14) and (15) from freezer
retainers (6) over valve stems.
one at a time and position in valve pocket.
Using a hardwood board and a lead hammer,
c.
Compress valve springs (7) and install valve
place hardwood board on valve seat (14) or (15)
spring locks (5). Release spring tension.
and drive seat into valve pocket until bottomed.
CAUTION
NOTE
Wear eye protective goggles. If valve
Intake and exhaust valve seats are
spring locks (5) are not correctly
different. Be sure to use correct seat.
installed, they can fly out when hit
with a hammer.
4-16
