E 250 3/4 Ton Van V8-5.4L CNG VIN M (1997)
Suspension Strut / Shock Absorber: Initial Inspection and Diagnostic Overview
WARNING: THE LOW-PRESSURE GAS SHOCK ABSORBERS ARE CHARGED WITH NITROGEN GAS. DO NOT ATTEMPT TO
OPEN, PUNCTURE OR APPLY HEAT TO THE SHOCK ABSORBERS.
All vehicles are equipped with low-pressure gas-filled hydraulic shock absorbers of the direct acting type. They are non-adjustable and non-refillable.
Before replacing a shock absorber, check the action of the shock absorbers as follows:
1. Check all tires for correct inflation.
2. Check the tires to verify correct front end alignment, tire balance and overall tire condition, such as separation or bulges.
3. Check the vehicle for optional suspension equipment, such as heavy-duty handling or trailer tow suspensions. These suspensions have a firmer
feeling ride than standard suspensions.
4. Check the vehicle attitude for evidence of possible overload or sagging.
5. Make sure the shock absorber is securely and properly installed.
6. Check the shock absorber insulators for damage and wear.
7. Replace any worn or damaged insulators and tighten the attachments to the specified torque (on a shock absorber that incorporates internal
insulators, replace the shock absorbers).
8. Inspect the shock absorber for evidence of fluid leakage. Leakage is a condition in which the entire shock body is covered with oil that drips from
the shock onto the pavement.
A light film of oil (weepage) on the upper portion of the shock absorber is permissible and is a result of proper shock lubrication. Weepage is a
condition in which a thin film of oil is deposited on the shock outer tube (body), and is normally noticed due to the collection of dust in this area.
Shock absorbers that exhibit this weepage condition should not be replaced for this reason alone.
9. If leakage exists:
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Make sure the fluid observed is not from sources other than the shock absorber.
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Replace the worn or damaged shock absorber.
NOTE: Make sure the part number of the replacement is the same as that of the original shock absorber.
10. Disconnect the lower end of the shock absorber.
11. Extend and compress the shock absorber as fast as possible, using as much travel as possible. Action should become smooth and uniform
throughout each stroke.
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Higher resistance on extension than on compression is a normal condition.
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Faint swish noises are also normal.
