NASCAR announced Tuesday that the No. 4 NASCAR Xfinity Series team has been penalized for an improperly-secured ballast that caused an accident during practice May 16 at Iowa Speedway.

The infraction was a violation of sections 12.1 (actions detrimental to stock car racing) and 20.17.2.1 (overall vehicle weight), which says that "any and all ballast added to the vehicle must be bolted inside an added ballasted container, inside the main frame rails, and/or inside the front sway bar mounting tube."

Crew chief Gary Cogswell has been fined $15,000 and placed on NASCAR probation through Dec. 31. Car chief Charles Kent has also been placed on NASCAR probation until Dec. 31.

While driving off pit road Saturday, a piece of lead flew off the No. 4 car, driven by Ross Chastain, and hit the windshield of the No. 55 car, driven by Jamie Dick. The lead crashed right through the glass and left a noticeable dent in Dick's helmet.