TM 5-3805-248-23-2
HEAD ASSEMBLY OVERHAUL - CONTINUED
0343 00
CLEANING - CONTINUED
WARNING
Solvent cleaning compound MIL-PRF-680 Type III is an environmentally compliant and low toxic
material. However, it may be irritating to the eyes and skin. Use protective gloves and goggles. Use in
well-ventilated areas. Keep away from open flames and other sources of ignition.
Particles blown by compressed air are hazardous. DO NOT exceed 15 psi (103 kPa) nozzle pressure
when drying parts with compressed air. Use a maximum of 30 psi (207 kPa) when cleaning compo-
nents. DO NOT direct compressed air against human skin. Failure to follow this warning may result in
injury or death. Make sure air stream is directed away from user and other personnel in the area. To pre-
vent injury, user must wear protective goggles or face shield.
3.
Use solvent cleaning compound to clean cylinder head of accumulations of grease, oil, carbon and grime.
4.
Use compressed air to dry cylinder head.
5.
Immerse cylinder head in solvent for eight hours or overnight.
6.
Remove cylinder head from solvent.
7.
Use scraper to remove all gasket residue while cylinder head is still wet.
8.
Use compressed air to dry cylinder head.
INSPECTION
1.
Use gage to measure thickness (A) of cylinder head. Replace cylinder head if gage extends above combustion surface or
head thickness is less than 4.390 in. (11.150 cm).
TOP DECK
PORT FACE
INTAKE PORT
FACE
394-1126A
CORE PLUG
2.
Use straightedge and feeler gage to check flatness of combustion surface along each edge and both diagonals. If more
than 0.005 in. (0.127 mm) from flat, discard and replace cylinder head. If less than 0.005 in. (0.127 mm) from flat, refer
to step 3 for machining instructions to correct warpage.
0343 00-2
