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GASOLINE TANK - PAGE 4-24
The gasoline tank vent is located at the top or
highest point of the tank and is connected by a hose
to a pipe leading up into the gasoline filler spout.
A tank that takes gas only very slowly or cannot
be completely filled, likely has a partial or entire
obstruction of the vent. To correct this condition,
remove the vent hose connection and insert a stiff
wire in each of the vent pipes to remove any obstruc-
tion, also check the hose connections to determine
that the filler hose connections are tightened and that
the hose is not twisted or kinked.
INTAKE MANIFOLD - PAGE 4-27
(6 CYLINDER)
On all 480 and 490 series 6 cylinder engines
including car Serial No. 492-51250 with aluminum
manifolds and car Serial No. 49176450 with cast
iron manifolds, the intake manifold carburetor
mounting flange was machined on the same plane as
the cylinder head resulting in a rearward tilt of the
carburetor due to the angle of securing the engine in
the frame. On all 6 cylinder engines after the above
serial No.'s a new intake manifold is used with the
flange angle changed to compensate for the angle at
which the engine is secured and allows the carbure-
tor to set in a vertical position when mounted.
This change eliminates the necessity for the use of
wedges as outlined in General Technical Policies
and Information Bulletin Number 6 dated January
14, 1949.
MANIFOLD STUDS - PAGE 4-27
(6 AND 8 CYLINDER)
There are two types of studs used on both 6 and 8
cylinder engines, namely one type stud has ma-
chined threads and the other has a rolled thread.
Studs 170990; 170991 and 170992 having a cen-
ter punch mark on one end, have a rolled thread and
this portion should be out, starting the other end in
the cylinder block. When there is no center punch
mark on the stud it
is a machine cut thread and the end having the 1/1 6
x 45 degree chamfer should be started in the cylinder
block, this is important s o that the stud will drive
tight before bottoming.
EXHAUST MANIFOLD CHOKE
HEATER TUBE - PAGE 4-27
(6 CYLINDER)
To insure silent passage of air through the exhaust
manifold automatic choke heater tube, the lower
opening of the tube has been choked at the end to a
3/16" diameter. Figure 3, the new tube part No.
300083 became effective in production August 25,
1949.
FIGURE 3
The old tube can be removed and the new tube
installed without removing the manifold as follows:
1. Remove the air cleaner and heat riser tube at
carburetor.
2. Use a piece of 1/4" drill rod approximately 14"
long and drive out the old tube from above.
NOTE: The drill rod fits inside the heater tube to
prevent swedging.
3. Install the new tube from above with the same drill
rod, driving the tube only far enough so that the
bottom end of the tube is flush with the bottom of
the manifold.
4. Reinstall air cleaner and riser heat tube.
19
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