28
Adjusting ring
37
Lockwasher
46
Fitting
29
Lock pin
38
Bearing retainer lock
47
Jam nut
30
Lock pin spring
39
Bearing retainer
48
Washer
31
Floating plate
40
Spacer
49
Screw
32
Hub & back plate
41
Bearing assembly
50
Plate
33
Driving plate
42
Hub key
51
Gasket
34
Center plate
43
Shaft
52
Fitting
35
Driving plate
44
Shaft key
53
Fitting
36
Capscrew
45
Bearing assembly
54
Housing
Figure 190 - Continued
341. Crane Engine Cylinder Head Cleaning,
344. Crane Engine Valve Assemblies Cleaning,
Inspection, and Repair
Inspection and Repair
a. Cleaning. Clean all parts with an approved
a. Cleaning.
cleaning solvent and dry thoroughly.
(1)
Clean all parts with an approved cleaning
b. Inspection and Repair. Check flatness of the
solvent.
cylinder head gasket contact surfaces with a straight edge
(2)
Clean carbon from valves, valve stems,
and feeler gauge in three positions lengthwise and five
and cylinder block and from around valve
crosswise. The maximum permissible is .004 inches low
seats and ports.
in the center lengthwise, gradually decreasing towards the
ends, or .003 inches crosswise or in localized spots.
b. Inspection and Repair.
Replace a defective cylinder head.
(1)
Inspect the valves for burned seats and
342. Crane Engine Cylinder Head Installation
pitted or bent stems. Stem diameter should
be 0.4335 to 0.4345 inch. Replace valves
a. Install cylinder head and tighten nuts in sequence
with bent or worn stems or badly burned
as instructed in figure 191.
faces.
(2)
Inspect the inside of each valve guide for
proper clearance. Intake should be 0.4360
c.
Install radiator hose (para. 153).
to 0.4370 inch. Exhaust should be 0.4390
to 0.4400 inch. Replace defective or worn
valve guides.
(3)
Inspect the exhaust valve seat inserts.
f.
Install generator regulator (para. 134).
Replace any that are loose, cracked or
g. Fill the cooling system.
otherwise damaged.
343. Crane Engine Valve Assemblies Removal and
(4)
Inspect the valve springs for proper tension.
Disassembly
They should have a load of 93 to 99 pounds
when compressed to 1 3/8 inches. Replace
a. Removal.
springs when they do not come within
(1)
Remove valve covers and gaskets (para.
limits.
(5)
Inspect the tappets for worn threads,
(2)
Remove the cylinder head (para. 340).
scores, cracks, and wear or pitting on the
face. Replace defective tappets. Tappet
(3)
Remove the valve assemblies from the
hole diameter should be between 1.125 and
engine block as instructed in figure 192.
1.126 inch.
b. Disassembly. Disassemble the valve assemblies
(6)
Inspect tappet adjusting screws and nut
in the numerical sequence as illustrated in figure 193.
locks for worn or damaged threads.
Replace if defective.
AGO 6819A
213
