1942 - 1947 CHEVROLET SHOP MANUAL

Section 2  - Frame

ANTI-ROTATION SPRING
CAM BUTTONS
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PISTON SCREW AND SPRING
INSIDE END VIEW OF PISTON
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REBOUND END
PISTON
FILLER PLUG
COMPRESSION RELIEF VALVE
Fig. 13—Opposed Cylinder Double-Acting Shock Absorber with External Relief Valves
and the compression piston with the spring-loaded compression valve. Each valve has a bleeder hole in the valve stem. Under normal car operation, when the fluid pressure is applied by the piston, transfer of fluid takes place through the bleeder hole, but for violent road shocks the valve opens, allowing a more rapid transfer of fluid past the valve seat as well as though the bleeder hole.
As the shock absorber arm moves downward, due to car spring rebound movement, pressure set up in the rebound cylinder forces fluid through the bleeder hole or opens the rebound valve, according to severity of rebound. At the same time the com­pression intake valve opens, due to the partial vacuum created in the compression cylinder, filling the compression cylinder with fluid.
As the shock absorber arm moves up, pressure set up in the compression cylinder forces fluid through the bleeder hole or opens the compression valve, according to severity of compression. At the same time the rebound intake valve opens, due to
the partial vacuum created in the rebound cylinder, filling the rebound cylinder with fluid.
In the above manner, the action of the fluid is the same in both the rebound and compression cylinders, but the rate of up and down movement of the arm is controlled by the size of the bleeder holes and tension of the valve springs. Identifi­cation of the valve assemblies is possible by the number stamped on the valve. The compression end of the front shock absorber is under the shock absorber arm.
EXTERNAL VALVE TYPE
A type of double-acting shock absorber avail­able as special equipment on either 1-1/2-ton con­ventional or C.O.E. models is shown in Fig. 13. This is an opposed cylinder design with external relief valves.
The two pistons of the shock absorber are held together by two screws in the same manner as the design previously described. The end caps must

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