TM 9-6115-604-34
NAVFAC P-8-633-34
CAUTION
Do not over-stake the head metal when installing the valve seats (26). Stake only enough to
seat and retain the valve seat. Over-staking will cause head cracking.
NOTE
In the following step, use air deflector plates (27) under the intake valve seats only. Deflector
plates are not used under the exhaust valve seats.
(8)
Install the air deflector plates (27) under the intake valve seats only. Install the valve seats (26) with the
chamfered side up. Using driver ST-1122 and staking tool ST-1288, seat and stake the valve seats in
place. If the staking tool is not available, a punch having a radius of 0.250 inch (6.35 mm) may be used to
peen the head metal over the chamfer on the valve seat.
(9)
Refinish the valve seats in accordance with paragraph 9-9.
m.
Crosshead Guides. Using spacer ST-1264, press new crosshead guides (24, Figure 9-1) into the head. If spacer
ST-1264 is not available, press new crosshead guides into the head to dimension A, Figure 9-8, being careful
that crosshead guides are not bent during installation.
n.
Install pipe plugs (19 and 20, Figure 9-1) using sealant MIL-S-45180, Type Ill. Install expansion plugs (21 and
22) in accordance with paragraph 2-10.
o.
Recondition the valves in accordance with paragraph 9-9.
p.
Inspect and test the valve springs in accordance with paragraph 9-9.
q.
Check the seating, and install the valves and springs in accordance with paragraph 9-9.
r.
Vacuum test the valve sealing in accordance with paragraph 9-9.
9-12. INTAKE AND EXHAUST VALVES MAINTENANCE.
a.
Inspect.
(1)
Remove the fuel injectors in accordance with paragraph 6-13.
(2)
Insert a flexible borescope through the injector port and inspect the intake and exhaust valves for evidence
of erosion and burning. Repair or replace defective valves as necessary.
(3)
Install the fuel injectors in accordance with paragraph 6-18.
b.
Remove.
(1)
Remove the cylinder heads in accordance with paragraph 9-5.
(2)
Remove the intake and exhaust valves in accordance with paragraph 9-6.
c.
Repair. Repair the intake and exhaust valves in accordance with paragraph 9-9.
d.
Install.
(1)
Install the intake and exhaust valves in accordance with paragraph 9-9.
(2)
Install the cylinder heads in accordance with paragraph 9-10.
9-23
