Section 2  - Frame

might cause the shank of the bolt to stretch.
A specially heat-treated bolt, part number 376125, having dimensions of 3/8"-24 x 3/4", should be used for this installation. Part num­ber 120369, nut should also be used.
Where the equipment and personnel is avail­able the cross members may be spot welded to the frame side members for additional rigid­ity. Electric arc welding is preferable to acetylene welding for this operation.
Install the battery carrier, and rear brake hose bracket using bolts having dimension of 5/16"-24 x 13/16", part No. 352814. The nut is
listed under part No. 121917.
12.   To reassemble the front suspension, rear sus­pension, brakes and wheels, reverse the dis­assembly instructions.
NOTE—It is necessary to bleed the brakes because the hydraulic line was opened.
13.   Check the frame assembly for alignment; any corrections needed would be slight. After the alignment of the frame has been checked, re­place the body bolts and adjust; reverse chassis sheet metal disassembly instructions.
Left Side-
The installation of a frame side member on the left side of a car is the same as described for the installation of the right frame side member, with the following exceptions:
1.    It is not necessary to disconnect the rear brake pipe, gasoline pipe or battery and carrier.
2.    It is necessary to disconnect the muffler sup­port bracket, and tail pipe bracket. Disconnect the steering gear assembly from the pitman arm, frame side member, and instrument panel so that the assembly can be pushed up toward the body.
Shock absorbers provide a smoother ride for the occupants of a car by dampening the spring vibra­tions as the car passes over irregularities in the road. There are two types of shock absorbers used on Chevrolet passenger cars and trucks; single-act­ing hydraulic and double-acting hydraulic. The double-acting shock absorbers dampen the motion of both REBOUND and COMPRESSION of the car springs. The single-acting shock absorber dampens the motion of car spring on REBOUND ONLY.
Double-acting shock absorbers are standard equipment, both front and rear on Chevrolet pas­senger Cars and are special equipment on all com-
merical and truck models. Single-acting shock absorbers are standard equipment front and rear on 1/2 and all 3/4-ton trucks, with exception of the rear on the 3/4-ton long Wheelbase panel.
The single-acting shock absorber is the most simple in construction of any used. A cut-away view of the external relief valve single-acting shock absorber is shown in Fig. 6. The body is of cast iron and houses the various parts as shown. A steel arm is securely attached to the shaft and a packing gland and washers are used around this shaft with a suitable seal provided. Inside the body and pressed on the same shaft is the cam which actuates the piston when the arm is moved. Since the piston must be returned to its normal position after a dis­placement, a spring is provided under the piston for this purpose.
Fig. 6-Single-Acting Shock Absorber
An intake valve is mounted in the piston and its function is to replenish fluid in the cylinder as the piston returns to its normal position. The reservoir consists of all the space in the shock absorber body outside of the cylinder which holds the piston and piston spring. A relief valve is located between the cylinder and the reservoir to relieve any excess pressure which may be created by sudden or rapid movement of the piston. This valve is easily acces­sible by removing the relief valve plug or nut. The open end of the shock absorber body is covered by a stamped steel cover plate and gasket. This cover is held in place by screws. Removing either the filler plug or relief valve permits filling or adding fluid.
The shock absorber body is mounted rigidly to the car frame side member while the arm is con­nected to a fitting on the car axle.
When the wheels strike a bump, the car springs compress and the car frame moves downward, carrying the shock absorber with it. This causes the shock absorber arm to move upward, relieving the cam pressure on the piston. Relieving this





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