Section XXIII. CRANE ENGINE LOCK
378.
General
The crane engine block is a solid, one-piece iron-
alloy casting. It houses the crankshaft, camshaft,
connecting rods, pistons and valves. The block has full
length water jacket around the cylinders and has water
passages around the valves for cooling. Drilled oil
passages carry oil under pressure to all bearings and
moving parts requiring lubrication.
379.
Crane
Engine
Block
Removal
and
Disassembly
a.
Removal.
(1) Remove the carburetor, distributor,
governor,
generator,
fuel
pump,
Figure 208. Crane engine block, exploded view.
generator regulator, water pump and
spark plugs (paras. 93, 125, 94, 132, 95,
f.
Inspect the engine block for breaks, cracks,
or other damage. Replace a cracked or broken engine
(2) Remove the radiator (para. 328).
block as necessary.
(3) Remove the valves (para. 343).
g.
Inspect the cylinder diameter.
It should
(4) Remove the pistons (para. 355).
measure between 4.249 and 4.251 inches.
(5) Remove the crankshaft (para. 375).
(6) Remove the camshaft (para. 371).
381.
Crane Engine
Block
Reassembly
and
(7) Remove the engine block.
Installation
b.
Disassembly. Disassemble the crane block
a.
Reassembly. Reassemble the crane engine
as illustrated on figure 208.
block as illustrated on figure 208.
380.
Crane Engine Block Cleaning and Inspection
b.
Installation.
a.
Soak the engine block in a strong caustic
(1)
Install the engine block.
solvent for 2 hours; remove and clean with live steam.
(2)
Install the camshaft (para. 373).
b.
Clean water and oil passages.
(3)
Install the crankshaft (para. 377).
c.
Inspect for wear and damage.
(4)
Install the pistons (para. 357).
d.
Check the machined surfaces of the block
(5)
Install the valves (para. 345).
with a straight edge and feeler gauge. If the surfaces
are warped more than 0.010 inch, replace block as
(6)
Install the radiator (para. 380).
necessary.
(7)
Install the carburetor, distributor,
e.
Inspect all mounting hardware for stripped or
governor,
generator,
fuel
pump,
damaged threads. Replace all defective hardware as
generator regulator, water pump, and
necessary.
spark plugs, (paras. 93, 125, 94, 132,
AGO 6819A
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