1942 - 1947 CHEVROLET SHOP MANUAL

Section 3  - Front Suspension, Axle & Springs

3-16
inside wheel must be at right angles to the radius line "C" which passes through the spindle and strikes the lines from the other three wheels at "D."
REPAIR OPERATIONS
When service men thoroughly understand the foregoing, they will appreciate the accuracy neces­sary when checking the front end system. There are several different kinds of equipment, by which these operations can be performed.
It must be remembered that no matter what kind of equipment is used, that all of these checks must be made with the truck level, with the weight of the truck on the wheels and with no pay load.
Bad steering performance may be due to some cause not connected with front wheel alignment. Therefore, check to see that none of the following conditions are present before placing the car on the front end machine:
1.   Loose or improperly adjusted steering gear.
2.   Steering housing loose at frame.
3.   Play or excessive wear in kingpins or bushings.
4.   Loose tie rod or steering connections.
5.   Loose spring shackles.
6.   Loose front spring "U" bolts.
7.   Front spring slipped on spring seat due to sheared center bolt.
8.   Over lubricated front springs.
9.   Sagging or broken front springs.
10.   Under inflated tires.
11.   Unbalanced or improperly mounted tires.
12.    Motor mountings improperly adjusted.
13.   Broken motor mountings.
14.   Motor not properly tuned, rough or "missing."
15.   Brakes dragging.
16.   Hub bolt nuts loose.
17.   Shock absorbers not operating properly, low on fluid or dry.
After this inspection is completed and the con­ditions corrected, the truck should be placed on the front end machine and checked. There are several types of front end machines on the market using different mechanical means for locating and cor­recting front end troubles. The instructions fur­nished by each manufacturer for the operation of his particular machine should be followed. How­ever, for the benefit of those service men who do not have access to any of the various front end machines, we shall explain the checking and cor­recting of front end alignment with the use of the "Jiffy" Wheel Aligning System.
CHECKING FRONT END ALIGNMENT
Before any front end alignment checks are made, the first thing that should be done is to make sure that the truck is on a level floor and that all tires are inflated to the proper pressure. Then, after making the foregoing preliminary inspections, pro­ceed to check the front end alignment.
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Fig. 37—Checking Kingpin Caster
CASTER CHECK
1.   Set the front wheels in a straight ahead posi­tion on the turntables with the turntable scale set at zero. Install the "Jiffy" gauge, J-800-A, parallel with the spindle.
2.   Turn the wheel on which the check is being made OUT 25°, center the bubble on the gauge and note the reading on the Caster Scale, Fig.
37.
3.   Now turn the wheel IN 25°, center the bubble and note the reading on the caster scale. The caster of the wheel is the amount in degrees of pointer travel from left to right from the first reading. Should the pointer travel from right to left, reverse caster is indicated.
CAMBER CHECK
1.   Set the wheels in a straight ahead position and install the "Jiffy" gauge parallel with the spindle as shown in Fig. 38.
2.   Adjust the gauge until the bubble in the level is centered and read the amount of camber on the scale. Camber is shown to the left of zero on the scale, reverse camber being indicated if the pointer is to the right of the zero mark on the scale.

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