TM 9-2320-211-20
(6) Loosen the four nuts securing the exhaust
the cap screws securing the exhaust manifold to the
pipe to the mounting flange (2, fig. 2-44). Turn the
intake manifold to 50 to 60 ft.-lb. torque.
mounting flange of the exhaust pipe coun-
( 7 ) Install a new exhaust-pipe-to-manifold
terclockwise (as viewed from the top) until the large
sealing ring at the upper end of the exhaust pipe.
holes in the flange are alined with the washers
Slip the exhaust pipe mounting flange (2, fig. 2-44)
under the mounting nuts. The exhaust flange will
over the nuts and washers on the exhaust pipe
slip over the mounting nuts separating the exhaust
mounting studs, and rotate the flange clockwise
pipe from its manifold.
(viewed from top) so that the small holes in the
f l a n g e are alined with the washers under the
the upper side and seven on the lower side of the
mounting nuts. Tighten the nuts.
intake and exhaust manifold assembly, from the
(8) Install the air-compressor-to-governor line
manifold studs on the right side of the front and
(1, fig. 2-44).
rear cylinder h e a d a s s e m b l i e s . R e m o v e t h e
( 9 ) Connect the primer pump tube to the
manifold clamps (4, fig. 2-44) and heat shield (5, 2-
priming tee (5). Tighten the connector (on vehicles
44).
equipped with primer pump).
(8) Remove the remaining two nuts from the
(10) Install the carburetor (para 2-65).
(11) Connect the distributor ventilation line
upper front and rear manifold studs, and remove
the manifold assembly. Remove and discard the
(3) and vacuum line (2) at the intake manifold.
manifold gaskets.
(12) Connect the crankcase ventilation
shutoff valve control, and adjust the shutoff valves
(9) Remove the three cap screws and washers
from the lower side of the exhaust manifold center
section, separate the intake and exhaust manifolds,
(13) Start the engine and run it until normal
operating temperature is reached. Check the
and remove the steel spacer at the center of the
tightness of all mounting nuts, bolts, and con-
intake manifold.
nections.
(10) Remove the exhaust manifold end
sections and packing rings (three rings on each end
section) from the center section.
a. Preliminary. Start the engine and run it until
c. I n s t a l l a t i o n .
normal operating temperature (160 to 170 F.) is
NOTE
reached.
The key numbers in parentheses are in
b. Valve Rocker Cover Removal.
(1) Disconnect the vacuum line (6, 2-44) at
(1) Thoroughly clean gasket surfaces on the
the crankcase metering valve.
manifolds and the front and rear cylinder heads,
(2) Remove the four nuts and lockwashers
and install new gaskets on the manifold studs.
securing the crankcase ventilating line connector
(2) With three packing rings in place on inner
(7, fig. 2-44) to the front and rear cylinder head
end of each exhaust manifold end section, insert the
covers. Remove the connector and discard the two
end sections in the front and rear ports of the center
connector gaskets.
section.
(3) Remove the three cap screw (8, fig. 2-44)
(3) Install the steel spacer between the
and washers securing the front or rear cover (9 and
assembly flanges o f t h e i n t a k e a n d e x h a u s t
10, fig. 2-44) to the cylinder head, and remove the
manifolds, and install three cap screws with
cover.
washers in the flanges from the lower side of the
( 4 ) Remove and discard the cylinder head
exhaust manifold center section. Do not tighten the
cover gasket.
cap screws ((6) below).
(5) If the engine has a crankcase ventilating
(4) Using a straightedge, twist the exhaust
shutoff valve (4. fig. 2-43), pull out the shutoff
manifold end sections until the mounting flanges
valve control handle.
are alined (flat in same plane) with the intake
NOTE
manifold mounting flanges.
Step (5) will prevent excessive air leakage
( 5 ) Position the manifold assembly on the
through the vacuum line into the intake
manifold studs on the right side of the front and
m a n i f o l d w h i c h c o u l d c a u s e improper
rear cylinder head assemblies, and secure it with
engine idling.
two hexagon nuts (3, fig. 2-44), one each on the
(6) If the engine has no shutoff valve, proceed
upper front and rear manifold studs.
w i t h s t e p s (a), (b), a n d ( c ) .
(6) Position the heat shield (5, `fig. 2-44) and
manifold clamps on the upper and lower manifold
from the intake manifold elbow.
studs and install the remaining 13 mounting nuts.
(b) Disconnect the distributor ventilation
Tighten the nuts to 80 to 90 ft-lb. torque. Tighten
line (11, fig. 2-44) from the intake manifold tee.
