TM 5-3810-289-34
from cylinder head.
2. After steam cleaning and disassembly,
submerge head in tank of appropriate cleaning solution
heated to near boiling temperature.
3.
Circulate solvent to increase
effectiveness on salt or lime deposits, grease, etc.
4. To remove heavy deposits of lime, use
circulated acid-type cleaners.
Warning: The use of acid is extremely
dangerous to workmen and injurious to machinery.
Acid should never be used in machine shop or near
any machine subject to rusting. Always provide a
tank of strong soda water as a neutralizing agent.
(e) Check oil transfer dowel at center of
head to make sure oil passage is open so oil will flow to
the rocker lever bearings.
Figure 3-121. Install injector sleeve holding tool ST-383.
(2) Magnetic crack detection. Inspect the
valve and injector port areas using a portable magnetic
crack detector, figure 3-122. Instructions for the use of
this device are on the inside cover of the carrying case.
(3) Cylinder head fuse plug. The cylinder
head has a fuse plug containing a metal-alloy center that
melts if the engine becomes overheated, figure 3-123.
(a)
Examine fuse plug for signs of
overheating.
(b) Install new plug if metal alloy has
melted.
(c) As engine disassembly proceeds, check
carefully for damage from overheating.
d. Repair.
(1) Sleeve eroded water holes. The cylinder
head surfaces around the water holes must be free of
any erosion, pits, scratches or blemishes which are more
Figure 3-122. Inspecting valve and injector port areas.
than 0.003 in. deep in the area 1/16 to 5/32-inch from
edge of water holes. Repair as follows:
(a) Insert holddown adapter of ST-1010 into
injector sleeve.
(b) Position tool on head with reamer guide
hole over water hole to be repaired.
(c) Insert tool holddown knob into holder
assembly and tighten down finger tight, figure 3-124.
(d) Insert locating pin into eroded hole and
tighten holddown knob.
(e) To set depth of reamer assembly, insert
assembly in guide. Place bushing between holder
assembly and reamer adjustable stop collar. Insert
0.005 in. feeler gage between bushing and adjustable
collar; tighten capscrew, figure 3-125.
Caution: Take care not to use too large a
reamer.
(f) Attach drive adapter to a drill chuck and
place grooved end of driver adapter into reamer
assembly.
(g) Ream out eroded water hole until collar
bottoms against tool.
Figure 3-123. Fuse plug location
1. Remove all pipe plugs and the fuse plug
3-45
