CHARLOTTE, N.C. — NASCAR suspended Denny Hamlin’s crew chief and car chief on Tuesday for six races because the Joe Gibbs Racing entry failed inspection following his third-place finish at Indianapolis Motor Speedway.

Darian Grubb and Wesley Sherrill were both suspended through the Sept. 6 race at Richmond. Grubb, the crew chief, was also fined $125,000.

It strips Hamlin of two vital crew members during the stretch of the season he would be putting the finishing touches on preparations for NASCAR’s title-deciding, 10-race Chase for the Sprint Cup championship. Grubb and Sherrill, who also each received six months’ probation, are not eligible to return until the Chase opener, Sept. 14.

JGR said in a statement it will appeal the penalty, but Grubb and Sherrill will begin serving their suspensions immediately. Under NASCAR rules, suspended competitors can compete until the appeal process is complete, but delaying sitting out would extend the suspensions into the Chase should portions of the penalty not get overturned.

Also, Hamlin and team owner Joe Gibbs were docked 75 points apiece in the driver and owner standings. It dropped Hamlin from 11th to 21st in the Sprint Cup standings. But, as a race winner already this season, Hamlin is likely guaranteed a spot in the 16-driver Chase field.

Hamlin’s car failed post-race inspection Sunday because NASCAR said it found issues with several of the covers in the rear firewall of the driver compartment. Loose or missing covers could vent the driver compartment and create more downforce for the car.