An engine mounting device for a motor vehicle having a casing attached to the engine, a flexible annular cylinder disposed inside the casing with a longitudinal axis generally parallel to the longitudinal axis of the vehicle body, a shaft attached to the vehicle body and disposed within the annulus of the flexible cylinder, whereby the casing and the flexible annular can move along the shaft in response to a frontal impact on the vehicle, and a retainer mounted on the shaft and arranged to prevent movement of the casing along the shaft below a predetermined threshold force on the casing.