May, 1972

Dear Chevrolet Truck Owner:

This notification applies to certain 1965 thru 1970 Chevrolet 10, 20 and 30 Series Truck models equipped with V-8 engines. Included in this group is the vehicle identified on the enclosed card.

At the request of the National Highway Traffic Safety Administration, and in accordance with the notification provisions of the National Highway and Motor Vehicle Safety Act of of 1966, we are sending this letter to call to your attention a possible safety hazard which exists should separation of an engine mount occur on your vehicle. If you will take your vehicle to any Chevrolet dealer, restraints will be installed at "no cost" to you to eliminate this possible safety hazard. We urge that you do so.

Your vehicle is equipped with two front engine mounts; one positioned on each side of the engine. An engine mount consists of a rubber cushion sandwiched between two metal plates. It supports and cushions the engine. Since the center portion of an engine mount is made of rubber, it is subject to fatigue from constant flexing during vehicle operation and from engine compartment heat. Replacement of fatigued engine mounts is a part of vehicle maintenance which is responsibility of the owner.

The possible safety hazard referred to exists when, as a result of fatigue or collision damage, the rubber portion of an engine mount has separated. When this condition exists, very rapid acceleration of the vehicle from a stop or from very low speeds can result in the engine rotating sufficiently to interfere with the accelerator linkage and cause the throttle to be held open temporarily. This can occur suddenly and without warning when the vehicle is in either forward or reverse gear. A sharp left turn during forward acceleration can increase the possibility of engine rotation if the left engine mount has separated.

If the throttle is unexpectedly held open, prompt action on the part of the driver will be required to avoid temporary loss of control of the vehicle. If that should occur, the driver should turn off the ignition and apply sufficient pressure on the brake pedal to bring the vehicle to a stop.

There is some possibility that engine rotation also may interfere with the normal operation of the clutch or shift linkage. If this occurs, additional effort may be required to shift the transmission.

Torque reaction forces, which can cause an engine with separated mounts to rotate sufficiently to affect the vehicle operation, can occur only during very rapid acceleration from a standing start or from very low speeds. It, therefore, is suggested that, except in emergency situations, you avoid such rapid acceleration from very low speeds until after restraints have been installed in your vehicle by a Chevrolet dealer.

Chevrolet has developed special restraints for installation in affected vehicles. In the event of engine mount separation, those restraints will limit engine rotation and thereby prevent interference with the normal operation of your vehicle. Installation of these restraints, therefore, will eliminate the possible safety hazard associated with engine mount separation which is described in this letter.

Again we urge that you take your vehicle to a Chevrolet dealer promptly to have those restraints installed. A restraint will be installed on both the left and right sides of the engine at "no cost" to you. In the great majority of cases the actual work to install these restraints will take less than 30 minutes; however, prior to taking your vehicle to a Chevrolet dealership, it is suggested that you contact the dealer's service department and determine when parts and service time will be available. Presentation of the enclosed Campaign Claim form will assist you in obtaining this service.

If, in the future, it is necessary to replace engine mounts on your vehicle, it is important that you install only interlocking type engine mounts. This type of mount limits engine rotation if separation occurs.