Figure 97. Valve cover, removal and installation.
Figure 98. Valve clearance, adjustment.
(3) Remove the rocker arm valve covers as
(3) Install the breather tube on the valve
instructed on figure 97.
cover assembly (para. 160).
b. Cleaning and Inspection.
171. Valve Clearance Adjustment
(1) Clean all parts with an approved cleaning
solvent.
(2) Inspect the valve cover for dents,
elongated holes, and other damage.
b. Adjust the intake and exhaust valve clearances
(3) Replace damaged parts as necessary.
as instructed on figure 98.
c. Installation.
(1) Install the rocker arm valve covers as
illustrated on figure 97.
(2) Install the accelerator bellcrank (para. 89).
Section XIV. CRANE ENGINE INTAKE AND EXHAUST SYSTEM
exhaust gases from the combustion chambers to the
172. General
muffler and discharges them into the atmosphere.
The six intake and six exhaust valves are located in
173. Valve Cover Assembly
the cylinder block on the right side of the engine and are
raised and lowered by tappets in contact with the
camshaft. Adjusting screws in the tappets provide the
a. Removal and Installation. Remove and install
means of adjusting the valve clearance. The stem of
the valve cover assembly as instructed on figure 99.
each valve rides within a valve guide pressed in the
block. Intake valves control the admission of the fuel-air
b. Cleaning and Inspection.
mixture to the cylinders, while the exhaust valves permit
(1) Clean all parts with an approved
the expulsion of the exhaust gases from the cylinder.
cleaning solvent. Remove the old gasket
The crane engine intake and exhaust system consists of
from the valve cover.
(2) Inspect the valve cover for cracks,
pipe.
The intake manifold provides an individual
breaks, bends, and other damage.
passage for each cylinder to deliver the fuel-air mixture
Replace defective cover and gasket.
from the carburetor. The exhaust manifold carries the
AGO 6819A
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